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| DOI：10.13522/j.cnki.ggps.2019262 |
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| Spatiotemporal Variation in Groundwater Table in Pingluo County |
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FAN Liqin, WU Xia, LI Lei, ZHANG Yonghong
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Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002, China
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| Abstract: |
| 【Background】Rising and falling of groundwater table is closely related to soil salinity in arid and semi-arid region and understanding the characteristics of seasonal groundwater fluctuation is critical to improving water and salt management.【Objective】The purpose of this paper is to analyze the spatiotemporal variation in depth of groundwater table in Pingluo County in Ningxia of China in attempts to improve its irrigation water use efficiency while in the meantime mitigating soil salinization.【Method】This study selected the monthly data of nine groundwater observation wells located in the area with different groundwater depth from 2007 to 2017, and the data of five influencing factors including water diversion from Yellow River, groundwater withdrawal amount, rice planting area, rainfall amount, and annual average temperature. The spatiotemporal variation in groundwater table and its leading factors were analyzed by the mathematical statistics method【Result】Intra-annual variation in the groundwater table was greater than inter-annual variation in the studied area. The monthly average groundwater table changed in "W" shape from spring to winder. From May to August and November to January of the following year, the groundwater change curves of all nine boreholes showed a drop, while in other months it rebounded. The variation coefficient of interannual groundwater table change in areas with different groundwater depth was ranked in: deep groundwater level > moderate groundwater level > shallow groundwater level, and this trend remained almost unchanged in the ten years. Compared with areas with moderate and shallow groundwater table, deep groundwater table was unstable. Correlation analysis revealed that water taken from the Yellow River and groundwater extraction were the two factors that affected the shallow and moderate groundwater most in the areas adjacent the Huinong Canal that diverting water from the Yellow River. The increase in cropping land also had a positive impact on groundwater table dropping.【Conclusion】Mitigating existing and potential soil salinity in the areas with shallow groundwater table should consider reducing the amount of water taken from the Yellow River for irrigation, using shallow groundwater or farmland drainage irrigation to ruduce groundwater table. |
| Key words: Pingluo County; groundwater depth; variation characteristics; water diversion from Yellow River |
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