Abstract
Global warming is predicted to increase water scarcity in many drylands worldwide. In Central Asia, one of the most intensively irrigated dryland agricultural regions, climate change is likely to exacerbate the regional water supply–demand gaps, particularly in downstream areas. The withdrawal of degraded, highly salinized croplands from irrigated farming in favor of tree plantations that effectively utilize saline groundwater may contribute to irrigation water saving, which can generate valuable ecosystem services and provide rural income opportunities. To facilitate the spatial planning of afforestation in the lower Amudarya region, we developed a hydrological algorithm to map the spatio-temporal pattern of water supply–demand. The resulting map, based on seven-year continuous data of cropping pattern and corresponding irrigation dynamics, rainfall, and evapotranspiration at 250 m resolution, revealed the overly irrigated areas from which excess water can be redistributed to water-stressed areas. Furthermore, combining this information with spatial data on marginally productive croplands and with water requirement of tree plantations showed that 67% of these croplands are characterized by water availability sufficient for the introduction of salt-tolerant tree species. The algorithm developed is of potential use for defining the feasibility of introducing alternative (tree) crops with known growth and water use characteristics.
Original language | English |
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Pages (from-to) | 53-61 |
Number of pages | 9 |
Journal | Journal of Arid Environments |
Volume | 162 |
DOIs | |
Publication status | Published - 2019 Mar |
Bibliographical note
Funding Information:This work was supported by the Robert Bosch Stiftung, Germany through the research program Robert Bosch Juniorprofessur Nachhaltige Nutzung natürlicher Ressourcen (Grant 325.8043.0005.0); by the International Atomic Energy Agency (IAEA), Austria through the coordinated research project Landscape salinity and water management for improving agricultural productivity (D1.20.13); and by Korea University, South Korea through Korea University Grant. Navneet Kumar thanks Dr. Jorge Guzman (USDA) and Dr. Maria Chu (University of Illinois) for their expert advice during the analysis.
Funding Information:
This work was supported by the Robert Bosch Stiftung, Germany through the research program Robert Bosch Juniorprofessur Nachhaltige Nutzung natürlicher Ressourcen (Grant 325.8043.0005.0 ); by the International Atomic Energy Agency (IAEA), Austria through the coordinated research project Landscape salinity and water management for improving agricultural productivity (D1.20.13); and by Korea University, South Korea through Korea University Grant. Navneet Kumar thanks Dr. Jorge Guzman (USDA) and Dr. Maria Chu (University of Illinois) for their expert advice during the analysis.
Publisher Copyright:
© 2018 Elsevier Ltd
Keywords
- Afforestation
- Aral Sea basin
- Canal irrigation
- Evapotranspiration
- Land degradation
- Water balance
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics
- Ecology
- Earth-Surface Processes