论文部分内容阅读
土壤水中的氢氧稳定同位素特征包含了水在包气带中的迁移信息,因此,分析土壤水中的氢氧稳定同位素的变化特征可以追踪土壤水的迁移过程。文中主要对呼和浩特地区西南部两个孔的包气带土壤剖面中氢氧稳定同位素随深度的变化特征进行了分析,并对呼和浩特地区降水、土壤水和地下水之间的同位素组成进行了比较。结果表明:该区土壤表层的水中的δ~2H和δ~(18)O受到降水中的δ~2H和δ~(18)O的直接影响,同时受到蒸发作用的影响,同位素值产生富集,之后变化幅度逐渐减小,逐渐接近地下水中的同位素值,显示出土壤底部的水分与地下水的交换比较活跃;通过对比该区降水、土壤水和地下水的同位素值,发现该区土壤水的补给来源主要为降水,且降水的补给为季节性补给,补给季节主要是秋季。
Hydrogen and oxygen stable isotope characteristics in soil water contain information about the migration of water in the aeration zone. Therefore, the analysis of the characteristics of stable oxygen and oxygen isotopes in soil water can trace the migration of soil water. In this paper, the variation characteristics of hydrogen and oxygen stable isotopes with depth in the soil profile of two pores in the southwestern part of Hohhot are analyzed, and the isotopic compositions of precipitation, soil water and groundwater in Hohhot are compared. The results show that δ ~ 2H and δ ~ (18) O in the surface water of the area are directly affected by δ ~ 2H and δ ~ (18) O in precipitation, meanwhile, the isotope value is enriched due to the evaporation , And then gradually decreased, gradually approaching the isotope values of groundwater, showing that the bottom of the soil water and groundwater exchange more active; by comparing the region precipitation, soil water and groundwater isotope values found in the area of soil water supply The main source of precipitation, precipitation and recharge for the seasonal supply, the supply season is mainly autumn.