基于稳定同位素的黄土塬区村庄涝池对地下水补给的定量分析
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国家自然科学基金面上项目“黄土塬区深剖面土壤水分平衡和地下水补给对土地利用/覆被变化的响应”(41771036)


Quantitative Study of Groundwater Recharge Beneath a Village Pond in Loess Tableland Based on Stable Isotopes
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    [目的] 定量研究黄土塬区村庄涝池对地下水的补给情况,为地下水资源持续利用提供理论依据。[方法] 通过测定长武黄土塬区村庄涝池和农田深剖面土壤湿度及土壤水氢氧稳定同位素组成,利用同位素示踪技术计算村庄涝池对地下水的补给量。[结果] ①涝池深剖面土壤水分平均值为25.5%,大于农田深剖面土壤湿度(20.6%); ②涝池土壤水的δD值介于-117.83‰~-56.66‰之间,δ18O值介于-16.63‰~-7.72‰之间,农田土壤水的δD介于-81.76‰~-52.03‰之间,δ18O值介于-10.64‰~-6.35‰之间;与农田相比,涝池土壤水分受蒸发影响较小,同位素组成偏负,且变幅较大; ③涝池土壤水同位素剖面保留了较大降水事件的同位素信号,表明涝池水通过活塞流形式对地下水进行了补给,活塞流速度为0.26 m/d;在涝池集水区内,地下水年均潜在补给量为134 mm,占年降水量的23.1%。[结论] 黄土塬区涝池是地下水重要的补给来源。因此,应加强涝池保护、恢复和重建工作,确保该区地下水的持续补给和利用。

    Abstract:

    [Objective] Groundwater recharge beneath a village pond in the loess tableland was quantitatively studied to provide a theoretical basis for the sustainable utilization of groundwater resources in the study area.[Methods] Soil moisture, and stable hydrogen and oxygen isotopic composition of soil water in deep loess profiles (DLP) beneath a village pond and cropland in Changwu loess tableland were measured. The isotopic tracing technique was used to estimate groundwater recharge beneath the village pond.[Results] ① The average soil moisture of DLP beneath the village pond was 25.5%, which was greater than that of cropland (20.6%). ② The values of δD and δ18O of soil water were -117.83‰~-56.66‰ and -16.63‰~-7.72‰, respectively, beneath the village pond, and -81.76‰~-52.03‰ and -10.64‰~-6.35‰ beneath the cropland, respectively. The effect of evaporation on soil water beneath the pond was weaker than it was in cropland, and the stable isotopes of soil water were more negative with larger variation in isotopic composition. ③ The isotope profile of soil water beneath the village pond retained the isotopic signals of large precipitation events, indicating that groundwater was recharged by piston flow beneath the village pond, and had an infiltration velocity of 0.26 m/d. The mean annual recharge rate of groundwater was 134 mm/yr in the pond catchment, accounting for 23.1% of the annual precipitation.[Conclusion] Village ponds are an important recharge source for groundwater in the Loess Plateau. Thus, efforts should be made to strengthen the protection, restoration, and reconstruction of ponds to ensure the continuous recharge and utilization of groundwater in the Loess Plateau.

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程立平,王亚萍,刘沛松,李彦娇.基于稳定同位素的黄土塬区村庄涝池对地下水补给的定量分析[J].水土保持通报,2021,41(5):60-66

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  • 收稿日期:2021-05-10
  • 最后修改日期:2021-06-08
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  • 在线发布日期: 2021-10-25