Adaption to water shortage through the implementation of a unique pipeline system in Victoria, Australia
- Mala-Jetmarova, Helena, Barton, Andrew, Bagirov, Adil, McRae-Williams, Pamela, Caris, Rob, Jackson, Peter
- Authors: Mala-Jetmarova, Helena , Barton, Andrew , Bagirov, Adil , McRae-Williams, Pamela , Caris, Rob , Jackson, Peter
- Date: 2010
- Type: Conference paper
- Relation: Paper presented at Hydropredict' 2010, 2nd International Interdisciplinary Conference on predications for Hydrology, Ecology, and Water Resources Management
- Full Text:
- Reviewed:
- Description: Abstract Water resource development has played a crucial role in the Grampians, Wimmera and Mallee regions of Australia, with the main source of surface water located in several reservoirs in the Grampians mountain ranges. Historically, water was delivered by gravity through a vast 19 500 km earthen channel system from the reservoirs to the townships and farms. As a result of the severe and protracted drought experienced in the region over the past 13 years and the projected drying climate, there have been fundamental changes made to the management of water in order to better cope with water scarcity. The primary strategic effort to sustainably manage water resources was by removing the unsustainable transport of water via the open channels which resulted in very high losses through seepage and evaporation. This inefficient system has been replaced by a pressurised pipeline, the largest geographical water infrastructure project of its type in Australia, spreading across an area of approximately 20 000 km2. To manage the change in water balance as a result of the pipeline and drying climate, the regions water corporations and environmental agencies have designed a scheme for water allocations intended to sustain local communities, allow for regional development and improve environmental conditions. This paper describes the unique pipeline system recently completed, provides a brief summary of water sharing arrangements and introduces the research program currently underway to optimise the performance of the pipeline system.
- Authors: Mala-Jetmarova, Helena , Barton, Andrew , Bagirov, Adil , McRae-Williams, Pamela , Caris, Rob , Jackson, Peter
- Date: 2010
- Type: Conference paper
- Relation: Paper presented at Hydropredict' 2010, 2nd International Interdisciplinary Conference on predications for Hydrology, Ecology, and Water Resources Management
- Full Text:
- Reviewed:
- Description: Abstract Water resource development has played a crucial role in the Grampians, Wimmera and Mallee regions of Australia, with the main source of surface water located in several reservoirs in the Grampians mountain ranges. Historically, water was delivered by gravity through a vast 19 500 km earthen channel system from the reservoirs to the townships and farms. As a result of the severe and protracted drought experienced in the region over the past 13 years and the projected drying climate, there have been fundamental changes made to the management of water in order to better cope with water scarcity. The primary strategic effort to sustainably manage water resources was by removing the unsustainable transport of water via the open channels which resulted in very high losses through seepage and evaporation. This inefficient system has been replaced by a pressurised pipeline, the largest geographical water infrastructure project of its type in Australia, spreading across an area of approximately 20 000 km2. To manage the change in water balance as a result of the pipeline and drying climate, the regions water corporations and environmental agencies have designed a scheme for water allocations intended to sustain local communities, allow for regional development and improve environmental conditions. This paper describes the unique pipeline system recently completed, provides a brief summary of water sharing arrangements and introduces the research program currently underway to optimise the performance of the pipeline system.
The effect of drought on uncertainty and agricultural investment in Australia
- Marangos, John, Williams, Catherine
- Authors: Marangos, John , Williams, Catherine
- Date: 2005
- Type: Text , Journal article
- Relation: Journal of Post Keynesian Economics Vol. 27, no. 4 (2005), p. 575-594
- Full Text: false
- Reviewed:
- Description: Recognizing that uncertainty plays an important role in decision making, it necessarily follows that the effects of the current devastating drought have significantly influenced the operations of primary producers and strongly impacted upon agricultural investment in Australia. The lack of water is heavily affecting rural exports and employment opportunities, and consequently, primary producers are experiencing financial ruin. Global economic uncertainty combined with the long-running drought is gripping rural communities. Understanding the likely effect of climate change on Australia's agricultural production will enable suitable adaptation strategies and government policies to be implemented for the future sustainability and development of the agricultural industry. © 2005 M.E. Sharpe, Inc.
- Description: C1
Learning to be drier in dryland country
- Smith, Erica, Campbell, Coral
- Authors: Smith, Erica , Campbell, Coral
- Date: 2009
- Type: Text , Journal article
- Relation: Australian Journal of Adult Learning Vol. 49, no. 3 (2009), p. 520-543
- Full Text:
- Reviewed:
- Description: This research project, part of a much larger study, considered how people in regional communities learnt to deal with the impact of reduced water availability as a result of drought or climate change. The communities in the Mallee-Wimmera region of Victoria, Australia, were the focus of this study and a range of local people from different sectors of the communities were involved in interviews, which became our main data source. We recognise the limitation that not all viewpoints could possibly be accessed in the participant selection process. The resultant data indicated that significant changes were being made to local practices as a result of the learning taking place and that there were a range of processes which enabled adult learning across the communities.
- Description: 2003007933
- Authors: Smith, Erica , Campbell, Coral
- Date: 2009
- Type: Text , Journal article
- Relation: Australian Journal of Adult Learning Vol. 49, no. 3 (2009), p. 520-543
- Full Text:
- Reviewed:
- Description: This research project, part of a much larger study, considered how people in regional communities learnt to deal with the impact of reduced water availability as a result of drought or climate change. The communities in the Mallee-Wimmera region of Victoria, Australia, were the focus of this study and a range of local people from different sectors of the communities were involved in interviews, which became our main data source. We recognise the limitation that not all viewpoints could possibly be accessed in the participant selection process. The resultant data indicated that significant changes were being made to local practices as a result of the learning taking place and that there were a range of processes which enabled adult learning across the communities.
- Description: 2003007933
Bearing the risk : Learning to be drier mid-river
- Golding, Barry, Angwin, Jennifer
- Authors: Golding, Barry , Angwin, Jennifer
- Date: 2009
- Type: Text , Journal article
- Relation: Australian Journal of Adult Learning Vol. 49, no. 3 (2009), p. 472-496
- Full Text:
- Reviewed:
- Description: This paper investigates learning related to the phenomena of drying over the past decade in the southern Murray-Darling Basin in Australia, as perceived in a mid-river site within the western Riverina of New South Wales, Australia. The insights from audio-recorded interviews, with a wide range of adults across the water-dependent community, mostly relate to the catchment of the Murrumbidgee River in the Shire of Hay. Our overarching theme is about how people are learning about, understanding and bearing the risks, of what is widely regarded as a prolonged drought. For some, the learning is about how to cope with less water in the Basin, and particularly from the river, as predicted in the climate change literature. Our narrative-based, empirical research registers the felt experience of those located, in situ, as a severe 'irrigation drought' extends into 2009. The paper dramatises the many obstacles to learning how to think and act differently, in difficult and rapidly changing ecosocial circumstances.
- Description: 2003007973
- Authors: Golding, Barry , Angwin, Jennifer
- Date: 2009
- Type: Text , Journal article
- Relation: Australian Journal of Adult Learning Vol. 49, no. 3 (2009), p. 472-496
- Full Text:
- Reviewed:
- Description: This paper investigates learning related to the phenomena of drying over the past decade in the southern Murray-Darling Basin in Australia, as perceived in a mid-river site within the western Riverina of New South Wales, Australia. The insights from audio-recorded interviews, with a wide range of adults across the water-dependent community, mostly relate to the catchment of the Murrumbidgee River in the Shire of Hay. Our overarching theme is about how people are learning about, understanding and bearing the risks, of what is widely regarded as a prolonged drought. For some, the learning is about how to cope with less water in the Basin, and particularly from the river, as predicted in the climate change literature. Our narrative-based, empirical research registers the felt experience of those located, in situ, as a severe 'irrigation drought' extends into 2009. The paper dramatises the many obstacles to learning how to think and act differently, in difficult and rapidly changing ecosocial circumstances.
- Description: 2003007973
Wicked learning : Reflecting on Learning to be drier
- Golding, Barry, Brown, Michael, Foley, Annette, Smith, Erica, Campbell, Coral, Schulz, Christine, Angwin, Jennifer, Grace, Lauri
- Authors: Golding, Barry , Brown, Michael , Foley, Annette , Smith, Erica , Campbell, Coral , Schulz, Christine , Angwin, Jennifer , Grace, Lauri
- Date: 2009
- Type: Text , Journal article
- Relation: Australian Journal of Adult Learning Vol. 49, no. 3 (2009), p. 544-566
- Full Text:
- Reviewed:
- Description: In this final, collaborative paper in the Learning to be drier edition, we reflect on and draw together some of the key threads from the diverse narratives in our four site papers from across the southern Murray-Darling Basin. Our paper title, Wicked learning, draws on a recent body literature (Rittel & Webber 1973) about messy or 'wicked problems' as characterised by Dietz and Stern (1998). It picks up on our identification of the difficulty and enormity of the learning challenges being faced by communities, associated, at best, with a decade of record dry years (drought) and severely over-committed rivers. At worst, drought is occurring in combination with and as a precursor to recent, progressive drying of the Basin associated with climate change. Our research is suggestive of a need for much more learning across all segments of the adult community about '... the big picture, including the interrelationships among the full range of causal factors ...' (Australian Public Service Commission, APSC 2007: 1) underlying the presenting problem of drying. We conclude that solutions to the messy or wicked problem of drying in an interconnected Basin will lie in the social domain. This will include building a wider knowledge and acceptance of the problems and likely future risks across the Basin including all parts of communities. The problem of drying as well as its causes and solutions are multidimensional, and will involve comprehensive learning about all five key characteristics of other 'wicked' policy problems identified in previous research in the environmental arena. The narratives that we have heard identify the extreme difficulty in all four sites of rational and learned responses to being drier as the problem has unfolded. All narratives about being drier that we have heard involve a recognition of a combination of the five characteristics common to wicked problems: multidimensionality, scientific uncertainty, value conflict and uncertainty, mistrust as well as urgency. All narratives identify the importance of social learning: to be productive, to be efficient, to survive, to live with uncertainty, to be sustainable and to share. Combating the extent and effects of drying, causality aside, will require new forms of learning through new community, social and learning spaces, apart from and in addition to new technological and scientific learning.
- Description: 2003007975
- Authors: Golding, Barry , Brown, Michael , Foley, Annette , Smith, Erica , Campbell, Coral , Schulz, Christine , Angwin, Jennifer , Grace, Lauri
- Date: 2009
- Type: Text , Journal article
- Relation: Australian Journal of Adult Learning Vol. 49, no. 3 (2009), p. 544-566
- Full Text:
- Reviewed:
- Description: In this final, collaborative paper in the Learning to be drier edition, we reflect on and draw together some of the key threads from the diverse narratives in our four site papers from across the southern Murray-Darling Basin. Our paper title, Wicked learning, draws on a recent body literature (Rittel & Webber 1973) about messy or 'wicked problems' as characterised by Dietz and Stern (1998). It picks up on our identification of the difficulty and enormity of the learning challenges being faced by communities, associated, at best, with a decade of record dry years (drought) and severely over-committed rivers. At worst, drought is occurring in combination with and as a precursor to recent, progressive drying of the Basin associated with climate change. Our research is suggestive of a need for much more learning across all segments of the adult community about '... the big picture, including the interrelationships among the full range of causal factors ...' (Australian Public Service Commission, APSC 2007: 1) underlying the presenting problem of drying. We conclude that solutions to the messy or wicked problem of drying in an interconnected Basin will lie in the social domain. This will include building a wider knowledge and acceptance of the problems and likely future risks across the Basin including all parts of communities. The problem of drying as well as its causes and solutions are multidimensional, and will involve comprehensive learning about all five key characteristics of other 'wicked' policy problems identified in previous research in the environmental arena. The narratives that we have heard identify the extreme difficulty in all four sites of rational and learned responses to being drier as the problem has unfolded. All narratives about being drier that we have heard involve a recognition of a combination of the five characteristics common to wicked problems: multidimensionality, scientific uncertainty, value conflict and uncertainty, mistrust as well as urgency. All narratives identify the importance of social learning: to be productive, to be efficient, to survive, to live with uncertainty, to be sustainable and to share. Combating the extent and effects of drying, causality aside, will require new forms of learning through new community, social and learning spaces, apart from and in addition to new technological and scientific learning.
- Description: 2003007975
Coping with severe drought : Stories from the front line
- Barton, Andrew, Briggs, Steven, McRae-Williams, Pamela, Prior, Darcy
- Authors: Barton, Andrew , Briggs, Steven , McRae-Williams, Pamela , Prior, Darcy
- Date: 2011
- Type: Text , Journal article
- Relation: Australian Journal of Water Resources Vol. 15, no. 1 (2011), p. 21-32
- Full Text: false
- Reviewed:
- Description: The last 12 years has seen extreme drought in western Victoria. This has impacted on the area in many ways, but none more so than in the provision of basic water supplies to people. To meet the challenge of drought, headworks storages have had to be operated at record low levels, severe water restrictions imposed, water carting programs established, alternative sources of water, and new technologies developed and used. Significant changes have also been made to the water supply infrastructure in the region, most notably the Northern-Mallee and Wimmera-Mallee Pipelines. This paper relates the story of how water resources were managed and bulk water was delivered to around 70,000 customers over a geographic spread of 62,000 km2, or about 30% of Victoria. Discussion on the social, environmental and economic impacts on the region are also provided. © Institution of Engineers Australia, 2011.
Future wet grasslands : Ecological implications of climate change
- Joyce, Chris, Simpson, Matthew, Casanova, Michelle
- Authors: Joyce, Chris , Simpson, Matthew , Casanova, Michelle
- Date: 2016
- Type: Text , Journal article
- Relation: Ecosystem Health and Sustainability Vol. 2, no. 9 (2016), p. 1-15
- Full Text:
- Reviewed:
- Description: Wet grasslands are threatened by future climate change, yet these are vital ecosystems for both conservation and agriculture, providing livelihoods for millions of people. These biologically diverse, transitional wetlands are defined by an abundance of grasses and periodic flooding, and maintained by regular disturbances such as grazing or cutting. This study summarizes relevant climate change scenarios projected by the Intergovernmental Panel on Climate Change and identifies implications for wet grasslands globally and regionally. Climate change is predicted to alter wet grassland hydrology, especially through warming, seasonal precipitation variability, and the severity of extreme events such as droughts and floods. Changes in the diversity, composition, and productivity of vegetation will affect functional and competitive relations between species. Extreme storm or flood events will favor ruderal plant species able to respond rapidly to environmental change. In some regions, wet grasslands may dry out during heatwaves and drought. C4 grasses and invasive species could benefit from warming scenarios, the latter facilitated by disturbances such as droughts, floods, and possibly wildfires. Agriculture will be affected as forage available for livestock will likely become less reliable, necessitating adaptations to cutting and grazing regimes by farmers and conservation managers, and possibly leading to land abandonment. It is recommended that agri-environment schemes, and other policies and practices, are adapted to mitigate climate change, with greater emphasis on water maintenance, flexible management, monitoring, and restoration of resilient wet grasslands.
- Authors: Joyce, Chris , Simpson, Matthew , Casanova, Michelle
- Date: 2016
- Type: Text , Journal article
- Relation: Ecosystem Health and Sustainability Vol. 2, no. 9 (2016), p. 1-15
- Full Text:
- Reviewed:
- Description: Wet grasslands are threatened by future climate change, yet these are vital ecosystems for both conservation and agriculture, providing livelihoods for millions of people. These biologically diverse, transitional wetlands are defined by an abundance of grasses and periodic flooding, and maintained by regular disturbances such as grazing or cutting. This study summarizes relevant climate change scenarios projected by the Intergovernmental Panel on Climate Change and identifies implications for wet grasslands globally and regionally. Climate change is predicted to alter wet grassland hydrology, especially through warming, seasonal precipitation variability, and the severity of extreme events such as droughts and floods. Changes in the diversity, composition, and productivity of vegetation will affect functional and competitive relations between species. Extreme storm or flood events will favor ruderal plant species able to respond rapidly to environmental change. In some regions, wet grasslands may dry out during heatwaves and drought. C4 grasses and invasive species could benefit from warming scenarios, the latter facilitated by disturbances such as droughts, floods, and possibly wildfires. Agriculture will be affected as forage available for livestock will likely become less reliable, necessitating adaptations to cutting and grazing regimes by farmers and conservation managers, and possibly leading to land abandonment. It is recommended that agri-environment schemes, and other policies and practices, are adapted to mitigate climate change, with greater emphasis on water maintenance, flexible management, monitoring, and restoration of resilient wet grasslands.
Climate drying amplifies the effects of land-use change and interspecific interactions on birds
- Bennett, Joanne, Clarke, Rohan, Horrocks, Gregory, Thomson, James, Mac Nally, Ralph
- Authors: Bennett, Joanne , Clarke, Rohan , Horrocks, Gregory , Thomson, James , Mac Nally, Ralph
- Date: 2015
- Type: Text , Journal article
- Relation: Landscape Ecology Vol. 30, no. 10 (2015), p. 2031-2043
- Full Text: false
- Reviewed:
- Description: Context: Climate change may amplify the effects of land-use change, including induced changes in interspecific interactions. Objectives: To investigate whether an avifauna changed over a period of severe drought, and if changes in avifaunas were related to changes in vegetation characteristics and the irruption of a despotic native species, the noisy miner Manorina melanocephala. Methods: In the box–ironbark forests of south-eastern Australia, we resurveyed the avifaunas and remeasured vegetation characteristics in 120 forest transects in 2010–2011 that had previously been measured in 1995–1997. Results: The avifauna changed markedly over the prolonged drought, and changes were more marked in smaller fragments of remnant vegetation in which more pronounced vegetation change had occurred. The noisy miner increased differentially in smaller remnants adding to the declines, especially for small-bodied birds. Conclusions: Long droughts interspersed with short wet periods are projected for the region, so the imposition of climate effects on an already much-modified region has profound implications for the avifauna. The noisy miner has (and continues) to benefit from both land-use and climate change, so future sequences of drought interspersed with short wet periods are likely to lead to further changes in the avifauna as the miner extends its occupancy. Differential reductions in small nectarivores and insectivores will affect ecosystem processes, including the control of defoliating insects, seed dispersal and pollination. © 2015, Springer Science+Business Media Dordrecht.
- Bates, Adam, Sadler, Jon, Greswell, Richard, Mackay, Rae
- Authors: Bates, Adam , Sadler, Jon , Greswell, Richard , Mackay, Rae
- Date: 2015
- Type: Text , Journal article
- Relation: Ecological Engineering Vol. 82, no. September (2015), p. 301-310
- Full Text: false
- Reviewed:
- Description: Green roofs can potentially be used to tackle a variety of environmental problems, and can be used as development mitigation for the loss of ground-based habitats. Brown (biodiversity) roofs are a type of green roof designed to imitate brownfield habitat, but the best way of engineering these habitats requires more research. We tested the effects of altering organic matter content on the development of vegetation assemblages of experimental brown (biodiversity) roof mesocosms. Three mulch treatments were tested: (1) sandy loam, where 10 mm of sandy loam mulch (about 3% organic matter by dry weight) was added to 100 mm of recycled aggregate; (2) compost, where the mulch also contained some garden compost (about 6% organic matter by dry weight); and (3) no mulch, where no mulch was added. Mesocosms were seeded with a wildflower mix that included some Sedum acre, and vegetation development was investigated over a six-year period. Species richness, assemblage character, number of plants able to seed, and above-ground plant biomass were measured. Drought disturbance was an important control on plant assemblages in all mulch treatments, but there were significant treatment response interactions. The more productive compost treatment was associated with larger plant coverage and diversity before the occurrence of a sequence of drought disturbances, but was more strongly negatively affected by the disturbances than the two less productive treatments. We suggest that this was due to the over-production of plant biomass in the more productive treatment, which made the plants more vulnerable to the effects of drought disturbance, leading to a kind of 'boom-bust' assemblage dynamic. The 'ideal' amount of added organic matter for these green roof systems was very low, but other types of green roof that have a larger water holding capacity, and/or more drought resistant plant floras, will likely require more organic matter or fertiliser. Nonetheless, nutrient-supported productivity in green roof systems should be kept low in order to avoid boom-bust plant assemblage dynamics. Research into the best way of engineering green roof habitats should take place over a long enough multi-year time period to include the effects of temporally infrequent disturbances. © 2015 Elsevier B.V.
Does major regional infrastructure influence the resilience of a rural community?
- Schwarz, Imogen, McRae-Williams, Pamela
- Authors: Schwarz, Imogen , McRae-Williams, Pamela
- Date: 2009
- Type: Text , Conference paper
- Relation: Paper presented at 10th National Rural Health Conference: Rural health, the place to be, Cairns, Queensland : 17th-20th May 2009
- Full Text:
- Description: 2003006931
- Authors: Schwarz, Imogen , McRae-Williams, Pamela
- Date: 2009
- Type: Text , Conference paper
- Relation: Paper presented at 10th National Rural Health Conference: Rural health, the place to be, Cairns, Queensland : 17th-20th May 2009
- Full Text:
- Description: 2003006931
Amaranthus retroflexus L (redroot pigweed) : effects of elevated CO2 and soil moisture on growth and biomass and the effect of radiant heat on seed germination
- Weller, Sandra, Florentine, Singarayer, Welgama, Amali, Chadha, Aakansha, Turville, Christopher
- Authors: Weller, Sandra , Florentine, Singarayer , Welgama, Amali , Chadha, Aakansha , Turville, Christopher
- Date: 2021
- Type: Text , Journal article
- Relation: Agronomy Vol. 11, no. 4 (2021), p.
- Full Text:
- Reviewed:
- Description: Amaranthus retroflexus L. (Amaranthaceae), Redroot pigweed, is native to North America, but has become a weed of agriculture worldwide. Previous research into competition with food crops found it significantly reduces yields. Additionally, taxonomy, biomass allocation, physiological responses to light intensity, water stress, elevated CO2, and herbicide resistance have been inves-tigated. To extend other research findings, we investigated growth and biomass yield in response to (i) soil moisture stress, and (ii) drought and elevated CO2. Additionally, we investigated seed germination rates following exposure to three elevated temperatures for two different time periods. Overall, moisture stress reduced plant height, stem diameter, and number of leaves. Elevated CO2 (700 ppm) appeared to reduce negative impacts of drought on biomass productivity. Heating seeds at 120◦C and above for either 180 or 300 s significantly reduced germination rate. These results inform an understanding of potential responses of A. retroflexus to future climate change and will be used to predict future occurrence of this weed. The finding that exposing seeds to high temperatures retards germination suggests fire could be used to prevent seed germination from soil seed banks, particularly in no-till situations, and therefore may be used to address infestations or prevent further spread of this weed. © 2021 by the authors. Licensee MDPI, Basel, Switzerland. **Please note that there are multiple authors for this article therefore only the name of the first 5 including Federation University Australia affiliates “Sandra Weller, Singarayer Florentine, Amali Welgama, Aakansha Chadha, Chrisopher Turville" are provided in this record**
- Authors: Weller, Sandra , Florentine, Singarayer , Welgama, Amali , Chadha, Aakansha , Turville, Christopher
- Date: 2021
- Type: Text , Journal article
- Relation: Agronomy Vol. 11, no. 4 (2021), p.
- Full Text:
- Reviewed:
- Description: Amaranthus retroflexus L. (Amaranthaceae), Redroot pigweed, is native to North America, but has become a weed of agriculture worldwide. Previous research into competition with food crops found it significantly reduces yields. Additionally, taxonomy, biomass allocation, physiological responses to light intensity, water stress, elevated CO2, and herbicide resistance have been inves-tigated. To extend other research findings, we investigated growth and biomass yield in response to (i) soil moisture stress, and (ii) drought and elevated CO2. Additionally, we investigated seed germination rates following exposure to three elevated temperatures for two different time periods. Overall, moisture stress reduced plant height, stem diameter, and number of leaves. Elevated CO2 (700 ppm) appeared to reduce negative impacts of drought on biomass productivity. Heating seeds at 120◦C and above for either 180 or 300 s significantly reduced germination rate. These results inform an understanding of potential responses of A. retroflexus to future climate change and will be used to predict future occurrence of this weed. The finding that exposing seeds to high temperatures retards germination suggests fire could be used to prevent seed germination from soil seed banks, particularly in no-till situations, and therefore may be used to address infestations or prevent further spread of this weed. © 2021 by the authors. Licensee MDPI, Basel, Switzerland. **Please note that there are multiple authors for this article therefore only the name of the first 5 including Federation University Australia affiliates “Sandra Weller, Singarayer Florentine, Amali Welgama, Aakansha Chadha, Chrisopher Turville" are provided in this record**
Effects on photosynthetic response and biomass productivity of acacia longifolia ssp. longifolia under elevated CO2 and water-limited regimes
- Javaid, Muhammad, Wang, Xiukang, Florentine, Singarayer, Ashraf, Muhammad, Mahmood, Athar, Li, Feng-Min, Fiaz, Sajid
- Authors: Javaid, Muhammad , Wang, Xiukang , Florentine, Singarayer , Ashraf, Muhammad , Mahmood, Athar , Li, Feng-Min , Fiaz, Sajid
- Date: 2022
- Type: Text , Journal article
- Relation: Frontiers in Plant Science Vol. 13, no. (2022), p.
- Full Text:
- Reviewed:
- Description: It is known that the impact of elevated CO2 (eCO2) will cause differential photosynthetic responses in plants, resulting in varying magnitudes of growth and productivity of competing species. Because of the aggressive invasive nature of Acacia longifolia ssp. longifolia, this study is designed to investigate the effect of eCO2 on gas exchange parameters, water use efficiency, photosystem II (PSII) activities, and growth of this species. Plants of A. longifolia ssp. longifolia were grown at 400 ppm (ambient) and 700 ppm (elevated) CO2 under 100 and 60% field capacity. Leaf gas exchange parameters, water use efficiency, intrinsic water use efficiency, instantaneous carboxylation efficiency, and PSII activity were measured for 10 days at 2-day intervals. eCO2 mitigated the adverse effects of drought conditions on the aforementioned parameters compared to that grown under ambient CO2 (aCO2) conditions. A. longifolia, grown under drought conditions and re-watered at day 8, indicated a partial recovery in most of the parameters measured, suggesting that the recovery of this species under eCO2 will be higher than that with aCO2 concentration. This gave an increase in water use efficiency, which is one of the reasons for the observed enhanced growth of A. longifolia under drought stress. Thus, eCO2 will allow to adopt this species in the new environment, even under severe climatic conditions, and foreshadow its likelihood of invasion into new areas. Copyright © 2022 Javaid, Wang, Florentine, Ashraf, Mahmood, Li and Fiaz.
- Authors: Javaid, Muhammad , Wang, Xiukang , Florentine, Singarayer , Ashraf, Muhammad , Mahmood, Athar , Li, Feng-Min , Fiaz, Sajid
- Date: 2022
- Type: Text , Journal article
- Relation: Frontiers in Plant Science Vol. 13, no. (2022), p.
- Full Text:
- Reviewed:
- Description: It is known that the impact of elevated CO2 (eCO2) will cause differential photosynthetic responses in plants, resulting in varying magnitudes of growth and productivity of competing species. Because of the aggressive invasive nature of Acacia longifolia ssp. longifolia, this study is designed to investigate the effect of eCO2 on gas exchange parameters, water use efficiency, photosystem II (PSII) activities, and growth of this species. Plants of A. longifolia ssp. longifolia were grown at 400 ppm (ambient) and 700 ppm (elevated) CO2 under 100 and 60% field capacity. Leaf gas exchange parameters, water use efficiency, intrinsic water use efficiency, instantaneous carboxylation efficiency, and PSII activity were measured for 10 days at 2-day intervals. eCO2 mitigated the adverse effects of drought conditions on the aforementioned parameters compared to that grown under ambient CO2 (aCO2) conditions. A. longifolia, grown under drought conditions and re-watered at day 8, indicated a partial recovery in most of the parameters measured, suggesting that the recovery of this species under eCO2 will be higher than that with aCO2 concentration. This gave an increase in water use efficiency, which is one of the reasons for the observed enhanced growth of A. longifolia under drought stress. Thus, eCO2 will allow to adopt this species in the new environment, even under severe climatic conditions, and foreshadow its likelihood of invasion into new areas. Copyright © 2022 Javaid, Wang, Florentine, Ashraf, Mahmood, Li and Fiaz.
Global environmental changes impact soil hydraulic functions through biophysical feedbacks
- Robinson, David, Hopmans, Jan, Filipovic, Vilim, van der Ploeg, Martine, Lebron, Inma, Jones, Scott, Reinsch, Sabine, Jarvis, Nick, Tuller, Markus
- Authors: Robinson, David , Hopmans, Jan , Filipovic, Vilim , van der Ploeg, Martine , Lebron, Inma , Jones, Scott , Reinsch, Sabine , Jarvis, Nick , Tuller, Markus
- Date: 2019
- Type: Text , Journal article
- Relation: Global Change Biology Vol. 25, no. 6 (2019), p. 1895-1904
- Full Text: false
- Reviewed:
- Description: Although only representing 0.05% of global freshwater, or 0.001% of all global water, soil water supports all terrestrial biological life. Soil moisture behaviour in most models is constrained by hydraulic parameters that do not change. Here we argue that biological feedbacks from plants, macro-fauna and the microbiome influence soil structure, and thus the soil hydraulic parameters and the soil water content signals we observe. Incorporating biological feedbacks into soil hydrological models is therefore important for understanding environmental change and its impacts on ecosystems. We anticipate that environmental change will accelerate and modify soil hydraulic function. Increasingly, we understand the vital role that soil moisture exerts on the carbon cycle and other environmental threats such as heatwaves, droughts and floods, wildfires, regional precipitation patterns, disease regulation and infrastructure stability, in addition to agricultural production. Biological feedbacks may result in changes to soil hydraulic function that could be irreversible, resulting in alternative stable states (ASS) of soil moisture. To explore this, we need models that consider all the major feedbacks between soil properties and soil-plant-faunal-microbial-atmospheric processes, which is something we currently do not have. Therefore, a new direction is required to incorporate a dynamic description of soil structure and hydraulic property evolution into soil-plant-atmosphere, or land surface, models that consider feedbacks from land use and climate drivers of change, so as to better model ecosystem dynamics.
Photosynthetic activity and water use efficiency of Salvia verbenaca L. under elevated CO2 and water‐deficit conditions
- Javaid, Muhammad Mansoor, Florentine, Singarayer, Ashraf, Muhammad, Mahmood, Athar, Sattar, Abdul, Wasaya, Allah, Li, Feng‐Min
- Authors: Javaid, Muhammad Mansoor , Florentine, Singarayer , Ashraf, Muhammad , Mahmood, Athar , Sattar, Abdul , Wasaya, Allah , Li, Feng‐Min
- Date: 2022
- Type: Text , Journal article
- Relation: Journal of agronomy and crop science Vol. 208, no. 4 (2022), p. 536-551
- Full Text:
- Reviewed:
- Description: Investigating the combined effects of elevated CO2 concentration and water‐deficit on weed plants is crucial to gaining a thorough understanding of plant performance and modifying agricultural processes under changing climate conditions. This study examined the effect of elevated CO2 concentration and water‐deficit conditions on leaf gas exchange, water use efficiency, carboxylation efficiency and the photosystem II (PSII) activity of two Salvia verbenaca L., varieties. These varieties were grown under two CO2 concentrations (ambient conditions of 400 ppm and elevated conditions of 700 ppm) and two water regimes (well‐watered [100% field capacity] and water‐deficit conditions [60% field capacity]) in laboratory growth chambers. For 12 days, at 2‐day intervals, (i) leaf gas exchange parameters (photosynthesis rate, stomatal conductance, transpiration rate (E) and intercellular CO2 concentration (Ci)), (ii) water use efficiency (WUE), (iii) intrinsic water use efficiency (IWUE), (iv) instantaneous carboxylation efficiency and (v) PSII activity (fluorescence, quantum yield of PSII, photochemical efficiency of PSII, photochemical quenching and photosynthetic electron transport) were measured. Water‐deficit conditions had negative effects on studied parameters of both varieties, whereas elevated CO2 concentration had positive effects on the gas exchange, water use efficiency and PSII activity of both. Salvia verbenaca varieties grown under water‐deficit conditions from Day 0 to Day 5 showed a partial recovery in most of the parameters when the resumption of the well‐watered regime was reinstituted on Day 6. Salvia verbenaca varieties grown under water‐deficit conditions were re‐watered on day 6 and indicated a partial recovery in all the parameters. A comparison of the two varieties showed that var. vernalis recorded higher values of gas exchange, quantum yield of PSII and photochemical efficiency of PSII than var. verbenaca, but the water use efficiency of var. verbenaca was higher than that of var. vernalis. These differences serve to illustrate the complexity of such studies and suggest that a detailed understanding of the nature of weed infestations is essential if optimum management control is to be practiced. Elevated CO2 concentration mitigated the adverse effects of water‐deficit conditions and thereby enhanced the adaptive mechanism of this weed by improving its water use efficiency. It is thus likely that S. verbenaca has the potential to take advantage of climate change by increasing its relative competitiveness with other plants in drought‐prone areas, suggesting that it could significantly expand its invasive range under such conditions.
- Authors: Javaid, Muhammad Mansoor , Florentine, Singarayer , Ashraf, Muhammad , Mahmood, Athar , Sattar, Abdul , Wasaya, Allah , Li, Feng‐Min
- Date: 2022
- Type: Text , Journal article
- Relation: Journal of agronomy and crop science Vol. 208, no. 4 (2022), p. 536-551
- Full Text:
- Reviewed:
- Description: Investigating the combined effects of elevated CO2 concentration and water‐deficit on weed plants is crucial to gaining a thorough understanding of plant performance and modifying agricultural processes under changing climate conditions. This study examined the effect of elevated CO2 concentration and water‐deficit conditions on leaf gas exchange, water use efficiency, carboxylation efficiency and the photosystem II (PSII) activity of two Salvia verbenaca L., varieties. These varieties were grown under two CO2 concentrations (ambient conditions of 400 ppm and elevated conditions of 700 ppm) and two water regimes (well‐watered [100% field capacity] and water‐deficit conditions [60% field capacity]) in laboratory growth chambers. For 12 days, at 2‐day intervals, (i) leaf gas exchange parameters (photosynthesis rate, stomatal conductance, transpiration rate (E) and intercellular CO2 concentration (Ci)), (ii) water use efficiency (WUE), (iii) intrinsic water use efficiency (IWUE), (iv) instantaneous carboxylation efficiency and (v) PSII activity (fluorescence, quantum yield of PSII, photochemical efficiency of PSII, photochemical quenching and photosynthetic electron transport) were measured. Water‐deficit conditions had negative effects on studied parameters of both varieties, whereas elevated CO2 concentration had positive effects on the gas exchange, water use efficiency and PSII activity of both. Salvia verbenaca varieties grown under water‐deficit conditions from Day 0 to Day 5 showed a partial recovery in most of the parameters when the resumption of the well‐watered regime was reinstituted on Day 6. Salvia verbenaca varieties grown under water‐deficit conditions were re‐watered on day 6 and indicated a partial recovery in all the parameters. A comparison of the two varieties showed that var. vernalis recorded higher values of gas exchange, quantum yield of PSII and photochemical efficiency of PSII than var. verbenaca, but the water use efficiency of var. verbenaca was higher than that of var. vernalis. These differences serve to illustrate the complexity of such studies and suggest that a detailed understanding of the nature of weed infestations is essential if optimum management control is to be practiced. Elevated CO2 concentration mitigated the adverse effects of water‐deficit conditions and thereby enhanced the adaptive mechanism of this weed by improving its water use efficiency. It is thus likely that S. verbenaca has the potential to take advantage of climate change by increasing its relative competitiveness with other plants in drought‐prone areas, suggesting that it could significantly expand its invasive range under such conditions.
Coping and resilience in farming families affected by drought
- Boyd, Candice, Caldwell, Kirra
- Authors: Boyd, Candice , Caldwell, Kirra
- Date: 2009
- Type: Text , Journal article
- Relation: Rural and Remote Health Vol. 9, no. (2009), p.
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- Description: Objectives: The present study was a qualitative investigation of the impact of drought on rural families of southern New South Wales, Australia, with particular emphasis on the concept of resilience in times of stress. The aim was to provide insight, from a psychological perspective, into the experiences of rural farmers in a time of adversity, and to identify the coping resources utilized by these farming families. Method: Participants were 11 members of five families from Blighty, a small farming town in the Riverina district, experiencing drought and decreased water allocation to their local area. Family members were interviewed on two separate occasions at their farms. Results: Analysis of interview transcripts revealed that a wide range of coping strategies were being utilized by these families from problem-focussed coping, optimism and positive appraisal to less adaptive strategies such as cognitive dissonance, denial and avoidance of negative social influences. A significant finding was the discovery of a range of collective coping strategies used by the families in this study and the reliance on social capital as an adaptive resource. There were signs, however, that social cohesion of this community had become compromised due to competition for resources. Conclusion: The adaptive coping mechanisms traditionally employed by these farming families are starting to weaken and urgent work to enhance the individual coping strategies of farmers is needed. Furthermore, Government needs to recognise the importance of social capital as a coping resource that will enable farming families to adapt and survive drought conditions into the future. Providing financial assistance to support current community initiatives and collective coping strategies may prove more beneficial to farmers than allocating inadequate amounts of funding to individual farming families.
- Description: 2003008039
- Authors: Boyd, Candice , Caldwell, Kirra
- Date: 2009
- Type: Text , Journal article
- Relation: Rural and Remote Health Vol. 9, no. (2009), p.
- Full Text:
- Reviewed:
- Description: Objectives: The present study was a qualitative investigation of the impact of drought on rural families of southern New South Wales, Australia, with particular emphasis on the concept of resilience in times of stress. The aim was to provide insight, from a psychological perspective, into the experiences of rural farmers in a time of adversity, and to identify the coping resources utilized by these farming families. Method: Participants were 11 members of five families from Blighty, a small farming town in the Riverina district, experiencing drought and decreased water allocation to their local area. Family members were interviewed on two separate occasions at their farms. Results: Analysis of interview transcripts revealed that a wide range of coping strategies were being utilized by these families from problem-focussed coping, optimism and positive appraisal to less adaptive strategies such as cognitive dissonance, denial and avoidance of negative social influences. A significant finding was the discovery of a range of collective coping strategies used by the families in this study and the reliance on social capital as an adaptive resource. There were signs, however, that social cohesion of this community had become compromised due to competition for resources. Conclusion: The adaptive coping mechanisms traditionally employed by these farming families are starting to weaken and urgent work to enhance the individual coping strategies of farmers is needed. Furthermore, Government needs to recognise the importance of social capital as a coping resource that will enable farming families to adapt and survive drought conditions into the future. Providing financial assistance to support current community initiatives and collective coping strategies may prove more beneficial to farmers than allocating inadequate amounts of funding to individual farming families.
- Description: 2003008039
Transient shifts in composition of degraded temperate native grassland following grazing exclusion
- Farmilo, Brad, Duncan, David, Moxham, Claire, Buchan, Anne, Turner, Vivienne, Ballentine, Michelle, White, Matt, Schultz, Nick
- Authors: Farmilo, Brad , Duncan, David , Moxham, Claire , Buchan, Anne , Turner, Vivienne , Ballentine, Michelle , White, Matt , Schultz, Nick
- Date: 2023
- Type: Text , Journal article
- Relation: Applied Vegetation Science Vol. 26, no. 2 (2023), p.
- Full Text: false
- Reviewed:
- Description: Questions Globally, grassy ecosystems are threatened and are still declining in extent in many areas. Improving the management of degraded native temperate grasslands that are grazed by livestock is important to the conservation of this critically endangered ecosystem. Questions remain about the role of grazing in the management of such grasslands, particularly in the face of climate change and given the sensitivity of these systems to inter‐annual rainfall variability. Here, we investigate the effect of livestock exclusion on grassland composition. Location Temperate grassland, Victoria, Australia. Methods Over 9 years (2009–2017), we monitored plant functional groups in plots open‐to‐grazing or ungrazed exclusion plots within five fields of degraded native temperate grassland on private land. Results In the years after grazing had been excluded, we found significant differences in cover between grazed and ungrazed plots for some functional groups (e.g. native perennial graminoids) in some years, but we did not observe long‐term divergence in cover or composition of the treatments. At the final monitoring point there were no significant differences in native or exotic species richness between the grazed and ungrazed plots. We show that the years in which differences were observed correspond with the 2010–2011 La Niña high‐rainfall event, suggesting that grazing exclusion effects are mediated by rainfall, and are likely to be evident only under certain conditions. Conclusion In grassy ecosystems already degraded by long‐term grazing, excluding grazing has limited potential to shift plant species composition in favour of native dominance. Such grasslands may persist in the medium term in a stable but degraded state with or without continued light to moderate livestock grazing pressure. Hence, managed livestock grazing need not be incompatible with the conservation of degraded temperate grasslands particularly where biomass management is important for the maintenance of faunal habitat. However, improving the function and diversity of these degraded grasslands will seemingly require additional management, including seed addition and experimentation with alternative disturbance regimes. We investigated the effect of livestock exclusion on degraded native temperate grasslands. We found that climate events caused short‐term differences in cover between grazed and ungrazed plots, but grazing exclusion had little potential to shift plant species composition. This highlights how additional management (e.g. seed addition, alternative disturbance regimes) is required to improve their function and diversity.
- Fest, Benedikt, Hinko-Najera, Nina, von Fischer, Joseph, Livesley, Stephen, Arndt, Stefan
- Authors: Fest, Benedikt , Hinko-Najera, Nina , von Fischer, Joseph , Livesley, Stephen , Arndt, Stefan
- Date: 2017
- Type: Text , Journal article
- Relation: Ecosystems Vol. 20, no. 2 (2017), p. 368-379
- Full Text: false
- Reviewed:
- Description: Soils in temperate forests ecosystems are the greatest terrestrial CH4 sink globally. Global and regional circulation models predict decreased average rainfall, increased extreme rainfall events and increased temperatures for many temperate ecosystems. However, most studies of soil CH4 uptake have only considered extended periods of drought rather than an overall decrease in rainfall amount. We measured soil CH4 uptake from March 2010 to March 2012 after installing passive rainfall reduction systems to intercept approximately 40% of throughfall in a temperate broadleaf evergreen eucalypt forest in south-eastern Australia. Throughfall reduction caused an average reduction of 15.1 ± 6.4% (SE) in soil volumetric water content, a reduction of 19.8 ± 6.9% in soil water-filled pore space (%WFPS) and a 20.1 ± 6.8% increase in soil air-filled porosity. In response to these changes, soil CH4 uptake increased by 54.7 ± 19.3%. The increase in soil CH4 uptake could be explained by increased diffusivity in drier soils, whilst the activity of methanotrophs remained relatively unchanged. It is likely that soil CH4 uptake will increase if rainfall reduces in temperate broadleaf evergreen forests of Australia as a consequence of climate change. © 2016, Springer Science+Business Media New York.
Impacts of climate change on weeds, insect pests, plant diseases and crop yields: Synthesis
- Jabran, Khawar, Florentine, Singarayer, Chauhan, Bhagirath
- Authors: Jabran, Khawar , Florentine, Singarayer , Chauhan, Bhagirath
- Date: 2020
- Type: Text , Book chapter
- Relation: Crop protection under changing climate 6 p. 189-195
- Full Text: false
- Reviewed:
- Description: Three distinct components of climate change in the recent times are warming of the earth, increased levels of carbon dioxide in the atmosphere and erratic changes in water availability to plants. These changes in the global climate not only impact the growth and life cycles of plants but also affect their pests. Recent research demonstrates that the effects of climate change on pests, pesticides (their efficacy and post-application chemistry) and pest management are complex. This is important to document changes in the behaviour of pests and pesticides in the wake of climate change and propose pest management strategies accordingly. Nevertheless, non-chemical methods and integrated pest management will play an important role in sustainable pest control under climate change. Further, the effects of climate change factors on crop protection and crop production are desired to be understood in order to maintain the global food supplies and global food security.
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