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| DOI：10.13522/j.cnki.ggps.2019233 |
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| Spatiotemporal Distribution of Soil Water and Shallow Groundwater in Check Dams in the Loess Plateau of China |
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YUAN Hongyou, FAN Jun, JIN Mu, MA Lihui
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1. College of Resources and Environment, Northwest A & F University, Yangling 712100, China; 2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China; 3. Institute of Soil and Water Conservation, Northwest A & F University, Yangling 712100, China
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| Abstract: |
| 【Background and objective】Soil water distribution in check dams is an important factor affecting agricultural production and ecological environment reconstruction in arid and semi-arid areas. The objective of this paper is to explore the spatiotemporal change in soil moisture and shallow groundwater in the check dams in the loess plateau of China.【Method】Soil moisture distribution was measured using the electrical resistivity tomography, in which several baselines were set up to measure the soil resistivity in two check dams at Liudaogou, Shenmu. Using the measured soil moisture and depth of shallow groundwater table, we analyzed the spatiotemporal change in shallow groundwater table as well as water storage in the aquifers.【Result】 There was a significant power-law relationship between soil resistivity and soil moisture content with P<0.05. Soil resistivity decreased downwards along the soil depth due to the decrease in soil moisture. From the gully head to the gully tail, the depth of shallow groundwater table in both dams increased, while storage of the groundwater declined first and then started to increase after passing the middle of the gully. Soil lost water from early winter to summer, while gained water from late summer to early autumn. The groundwater storage reached its lowest point in summer with its value ranging from 85 949 to 93 486 m3, and peaked in winter with its value ranging from 94 196 to 99 309 m3. 【Conclusion】Water exists in the check dams and the shallow groundwater in it changes seasonally. Coordinating use of this type of water resource could ameliorate temporary water shortage. |
| Key words: Loess plateau; check dam; electrical resistivity tomography; soil resistivity; shallow groundwater |
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