Soil water movement and deep drainage through thick vadose zones on the northern slope of the Tianshan Mountain: Croplands <i>vs.</i> natural lands

Fang-qiang Sun; Li-he Yin; Wu-hui Jia; Jun Zhang; Xiao-yong Wang; Li-feng Zhu; Xin-xin Zhang; Xiao-ping Tang; Jia-qiu Dong

doi:10.31035/cg2020008

2020 Vol. 3, No. 1

Article Contents

Article navigation > China Geology > 2020 > 3(1): 113-123

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Fang-qiang Sun, Li-he Yin, Wu-hui Jia, Jun Zhang, Xiao-yong Wang, Li-feng Zhu, Xin-xin Zhang, Xiao-ping Tang, Jia-qiu Dong, 2020. Soil water movement and deep drainage through thick vadose zones on the northern slope of the Tianshan Mountain: Croplands vs. natural lands, China Geology, 3, 113-123. doi: 10.31035/cg2020008

Citation:

Fang-qiang Sun, Li-he Yin, Wu-hui Jia, Jun Zhang, Xiao-yong Wang, Li-feng Zhu, Xin-xin Zhang, Xiao-ping Tang, Jia-qiu Dong, 2020. Soil water movement and deep drainage through thick vadose zones on the northern slope of the Tianshan Mountain: Croplands vs. natural lands, China Geology, 3, 113-123. doi: 10.31035/cg2020008

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

a.
Xi’an Center of Geological Survey, China Geological Survey, Ministry of Natural Resources, Xi’an 710054, China
b.
School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China
c.
Chinese Academy of Geological Sciences, China Geological Survey, Ministry of Natural Resources, Beijing 100037, China

More Information

Corresponding author: ylihe@cgs.cn (Li-he Yin)

Received Date: 12 December 2019

Revised Date: 08 February 2020

Accepted Date: 13 March 2020

Available Online: 16 March 2020

Publish Date: 25 January 2020

Abstract

Abstract

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 suggest that soil water in topsoil (< 2 m) 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.
- Land-use /
- Soil water /
- Groundwater recharge /
- Deep drainage /
- Unsaturated zone /
- Arid regions /
- Cropland /
- Natural land /
- Groundwater survey engineering /
- Tianshan Mountain /
- China

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References

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