土壤-水混合实验同位素变化研究

Isotopic variations of soil and input water mixing

摘要: 土壤是一个复杂的系统,研究土壤对输入水分中氢氧稳定同位素组成的影响对了解水分在土壤中的运移机理及流域径流分割等具有重要作用。通过两种不同土壤与同一种输入水之间和同一种土壤与两种不同输入水之间的两组混合实验,研究土壤水与输入水达到同位素平衡的时间和引起二者同位素变化的原因。实验结果表明,土壤水与输入水之间同位素变化主要由混合作用引起;土壤对输入水氢氧同位素的吸附现象较难观测到,易被氢氧同位素测样误差掩盖,有待进一步研究;土壤水和输入水在混合搅拌条件下最快能在0.5～1h达到同位素平衡。

Abstract: Soil is a complex system. It is important to study isotopic variations in input water in soil system for water movement mechanism and hydrograph separation. Mechanisms causing isotopic variations and time for reaching isotopic balance between different soil water and input water are studied through soil water mixing experiments. Experimental results show that isotopic variations in mixing water are mainly caused by isotopic mixing between soil water and input water. It is rather difficult to obs...