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Soil water movement and deep drainage through thick vadose zones on the northern slope of the Tianshan Mountain; croplands vs. natural lands

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doi: 10.31035/cg2020008
Authors:Sun Fangqiang; Yin Lihe; Jia Wuhui; Zhang Jun; Wang Xiaoyong; Zhu Lifeng; Zhang Xinxin; Tang Xiaoping; Dong Jiaqiu
Author Affiliations:Primary:
China Geological Survey, Xi'an Center of Geological Survey, Xi'an, China
Other:
China University of Geosciences, China
Volume Title:China Geology
Source:China Geology, 3(1), p.113-123. Publisher: China Geology Editorial Office, Beijing, China. ISSN: 2096-5192
Publication Date:2020
Note:In English. 78 refs.; illus., incl. 4 tables, sketch maps
Summary:Regional aridity is increasing under global climate change, and therefore the sustainable use of water resources has drawn attention from scientists and the public. Land-use changes can have a significant impact on groundwater recharge in arid regions, and quantitative assessment of the impact is key to sustainable groundwater resources management. In this study, the changes of groundwater recharge after the conversion of natural lands to croplands were investigated and compared in inland and arid region, i.e., the northern slope of the Tianshan Mountain. Stable isotopes suggests that soil water in topsoil (<2m) has experienced stronger evaporation under natural lands than croplands, and then moves downward as a piston flow. Recharge was estimated by the tracer-based mass balance method, i.e., chloride and sulfate. Recharge rates under natural conditions estimated by the chloride mass balance (CMB) method were estimated to be 0.07 mm/a in deserts and 0.4 mm/a in oases. In contrast, the estimated groundwater recharge ranged from 61.2 mm/a to 44.8 mm/a in croplands, indicating that groundwater recharge would increase significantly after land changes from natural lands to irrigated croplands in arid regions. Recharge estimated by the sulfate mass balance method is consistent with that from the CMB method, indicating that sulfate is also a good tracer capable of estimating groundwater recharge.
Subjects:D/H; Deuterium; Geochemical indicators; Ground water; Hydrogen; Isotope ratios; Isotopes; Land use; Movement; O-18/O-16; Oxygen; Recharge; Slopes; Soils; Stable isotopes; Topsoil; Water regimes; Water resources; Yields; Asia; China; Far East; Tien Shan; Xinjiang China
Coordinates:N440000 N442000 E0882000 E0874000
Record ID:893279-10
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