Climate change impacts on water sustainability of South African crop production
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Title |
Climate change impacts on water sustainability of South African crop production
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Creator |
Bonetti, S.
Sutanudjaja, E. H. Mabhaudhi, Tafadzwanashe Slotow, R. Dalin, C. |
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Subject |
crop production
water resources sustainability climate change food security water footprint virtual water water availability water requirements water use groundwater spatial distribution forecasting evapotranspiration |
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Description |
Agricultural production in arid and semi-arid regions is particularly vulnerable to climate change, which, combined with projected food requirements, makes the sustainable management of water resources critical to ensure national and global food security. Using South Africa as an example, we map the spatial distribution of water use by seventeen major crops under current and future climate scenarios, and assess their sustainability in terms of water resources, using the water debt repayment time indicator. We find high water debts, indicating unsustainable production, for potatoes, pulses, grapes, cotton, rice, and wheat due to irrigation in arid areas. Climate change scenarios suggest an intensification of such pressure on water resources, especially in regions already vulnerable, with a country-scale increase in irrigation demand of between 6.5% and 32% by 2090. Future land use planning and management should carefully consider the spatial distribution and local sustainability of crop water requirements to reduce water consumption in water risk hotspots and guarantee long-term food security.
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Date |
2022-08-01
2022-07-31T04:47:56Z 2022-07-31T04:47:56Z |
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Type |
Journal Article
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Identifier |
Bonetti, S.; Sutanudjaja, E. H.; Mabhaudhi, Tafadzwanashe; Slotow, R.; Dalin, C. 2022. Climate change impacts on water sustainability of South African crop production. Environmental Research Letters, 17(8):084017. [doi: https://doi.org/10.1088/1748-9326/ac80cf]
1748-9326 https://hdl.handle.net/10568/120374 https://iopscience.iop.org/article/10.1088/1748-9326/ac80cf/pdf https://doi.org/10.1088/1748-9326/ac80cf H051305 |
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Language |
en
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Rights |
CC-BY-4.0
Open Access |
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Format |
17(8):084017
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Publisher |
IOP Publishing
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Source |
Environmental Research Letters
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