Massive crop expansion threatens agriculture and water sustainability in northwestern China
نویسندگان
چکیده
Abstract Northwestern China (NWC) is among the major global hotspots undergoing massive terrestrial water storage (TWS) depletion. Yet driver(s) underlying such region-wide depletion remain controversial, i.e. warming-induced glaciermelting versus anthropogenic activities. Reconciling this controversy core initial step to guide policymaking combat dual challenges in agriculture production and scarcity vastly dry NWC toward sustainable development. Utilizing diverse observations, we found persistent cropland expansion by >1.2 × 10 4 km 2 since 2003, leading growth of 59.9% irrigated area 19.5% agricultural use, despite a steady enhancement irrigation efficiency. Correspondingly, substantially faster evapotranspiration (ET) increase occurred crop areas, whereas precipitation exhibited no long-term trend. Counterfactual analyses suggest that TWS unlikely have without an expansion-driven ET even presence glaciermelting. These findings imply management critically needed ensure security NWC.
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ژورنال
عنوان ژورنال: Environmental Research Letters
سال: 2022
ISSN: ['1748-9326']
DOI: https://doi.org/10.1088/1748-9326/ac46e8