| 引用本文: | 赵志鹏,杨丽虎,公亮,等.银川平原永宁引黄灌区土壤水分运移的氢氧同位素特征研究[J].灌溉排水学报,0,():-. |
| ZHAO Zhipeng,Yang Lihu,GONG Liang,et al.银川平原永宁引黄灌区土壤水分运移的氢氧同位素特征研究[J].灌溉排水学报,0,():-. |
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| 摘要: |
| 【目的】揭示干旱区降雨或灌溉条件下的包气带水分运移规律，为干旱区农业水资源管理提供理论依据。【方法】利用原位观测和同位素示踪方法，对银川平原永宁引黄灌区的降雨特征和降雨、灌溉水、土壤水、地下水同位素组分进行了分析。【结果】2019年4~10月降雨量为157.3 mm，最大降雨量月为6月，占全年降雨量的55%，总体上降雨表现为短历时的小到中雨。土壤水δＤ和δ18Ｏ的最大值随着土层深度的增加而减小，0~50 cm土壤水氢氧同位素的标准差大于70~270 cm的标准差。 5月7日、6月25日、6月27日降雨对0~50 cm土层的贡献比例分别为13.7%、14.8%和83.9%。灌溉水在0~50 cm土层的贡献比例为49.3%~100.0%，70 cm以下的贡献比例为14.3%~46.6%。【结论】降雨或灌溉水的同位素组成在土壤剖面形成了不同的分布特征，根据分布特征可以得知降雨入渗的影响范围在30~50 cm以内，灌溉入渗的影响范围达到270 cm，土壤水蒸发消耗主要发生在0~50 cm土层。 |
| 关键词: 包气带；土壤水；氢氧同位素；水分运移；银川平原 |
| DOI： |
| 分类号:S273.4;P951 |
| 基金项目: |
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| Hydrogen and oxygen isotopes characteristics of soil water movement in Yongning Yellow River irrigation area of Yinchuan plain |
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ZHAO Zhipeng1, Yang Lihu2, GONG Liang3, LI Bingliang4, MA Xudong3, XU Yingchun2, LIU Haiyan3
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1.Geological Bureau of Ningxia Hui Autonomous Region;2.Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences;3.Ningxia Geological Survey Institute;4.China University of Geosciences
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| Abstract: |
| 【Background】 Rainfall and surface irrigation have the strong influence on soil water movement in the Yellow River irrigation area of Yinchuan Plain, China. However, little interest has been paid to the actual movement of the percolating water. Thus, there is still a need to investigate the dynamics of soil water regime after rainfall and surface irrigation. 【Objective】 The objective is to investigate water movement through the unsaturated zone after rainfall or irrigation and provide a theoretical basis for agricultural water resources management in arid areas. 【Method】The field observation and isotope tracing method were used to analyze the rainfall characteristics and isotopes of rainfall, irrigation water, soil water and groundwater in the unsaturated zone of Yongning Yellow River irrigation area of Yinchuan plain. 【Result】The results showed that the rainfall observed from April to October 2019 was 157.3 mm. The maximum monthly rain was in July, which accounts for 55% of annual precipitation. In general, the rainfall was characterized by small rain and moderate rain. The maximum δD and δ18O in soil water from up to down decreased. Conversely, the standard deviation of isotopic compositions in soil water at 0~50 cm was greater than others. On May 7, June 25, and June 28, the precipitation accounted for about 13.7%, 14.8% and 83.9% of soil water at 0~50 cm, respectively. The irrigation water accounted for about 49.3% ~100.0% of soil water at 0~50 cm, and 14.3%~46.6% below 70 cm.【Conclusion】There are different distribution characteristics about isotopic composition of soil water from rainfall or irrigation water in the soil profile, which indicates that the impact range of infiltration by rainfall is within 30~50 cm, and that by irrigation reaches 270 cm and that the evaporation mainly happens at 0~50 cm. |
| Key words: Unsaturated zone; Soil water；Hydrogen and oxygen isotopes；Water movement; Yinchuan plain |
