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Article

Afforestation of Degraded Croplands as a Water-Saving Option in Irrigated Region of the Aral Sea Basin

1
Center for Development Research (ZEF), University of Bonn, Genscherallee 3, 53113 Bonn, Germany
2
Division of Environmental Science and Ecological Engineering, Korea University, 145 Anam-Ro, Seongbuk-Gu, Seoul 02841, Korea
3
Department of Remote Sensing, University of Würzburg, Oswald-Külpe-Weg 86, 97074 Würzburg, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Pilar Montesinos
Water 2021, 13(10), 1433; https://doi.org/10.3390/w13101433
Received: 5 April 2021 / Revised: 10 May 2021 / Accepted: 18 May 2021 / Published: 20 May 2021
Climate change is likely to decrease surface water availability in Central Asia, thereby necessitating land use adaptations in irrigated regions. The introduction of trees to marginally productive croplands with shallow groundwater was suggested for irrigation water-saving and improving the land’s productivity. Considering the possible trade-offs with water availability in large-scale afforestation, our study predicted the impacts on water balance components in the lower reaches of the Amudarya River to facilitate afforestation planning using the Soil and Water Assessment Tool (SWAT). The land-use scenarios used for modeling analysis considered the afforestation of 62% and 100% of marginally productive croplands under average and low irrigation water supply identified from historical land-use maps. The results indicate a dramatic decrease in the examined water balance components in all afforestation scenarios based largely on the reduced irrigation demand of trees compared to the main crops. Specifically, replacing current crops (mostly cotton) with trees on all marginal land (approximately 663 km2) in the study region with an average water availability would save 1037 mln m3 of gross irrigation input within the study region and lower the annual drainage discharge by 504 mln m3. These effects have a considerable potential to support irrigation water management and enhance drainage functions in adapting to future water supply limitations. View Full-Text
Keywords: drainage ratio; irrigation; spatial water balance; Soil and Water Assessment Tool (SWAT); scenario analysis; stream flow; water yield drainage ratio; irrigation; spatial water balance; Soil and Water Assessment Tool (SWAT); scenario analysis; stream flow; water yield
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MDPI and ACS Style

Kumar, N.; Khamzina, A.; Knöfel, P.; Lamers, J.P.A.; Tischbein, B. Afforestation of Degraded Croplands as a Water-Saving Option in Irrigated Region of the Aral Sea Basin. Water 2021, 13, 1433. https://doi.org/10.3390/w13101433

AMA Style

Kumar N, Khamzina A, Knöfel P, Lamers JPA, Tischbein B. Afforestation of Degraded Croplands as a Water-Saving Option in Irrigated Region of the Aral Sea Basin. Water. 2021; 13(10):1433. https://doi.org/10.3390/w13101433

Chicago/Turabian Style

Kumar, Navneet, Asia Khamzina, Patrick Knöfel, John P.A. Lamers, and Bernhard Tischbein. 2021. "Afforestation of Degraded Croplands as a Water-Saving Option in Irrigated Region of the Aral Sea Basin" Water 13, no. 10: 1433. https://doi.org/10.3390/w13101433

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