准噶尔盆地南缘土壤水运移特征及其补给来源识别

doi:10.13866/j.azr.2017.06.08

摘要/Abstract

摘要： 摘要：在荒漠区，土壤水是一切陆生植物赖以生存的基础，识别荒漠区土壤水的补给来源，探索土壤水的运移机理，对于荒漠区生态修复非常必要。通过对荒漠区非饱和带剖面土壤水的含水率、易溶盐离子及稳定同位素（δD、δ18O）的测定和分析，研究荒漠区土壤水的补给来源与运移机理。结果表明：荒漠区土壤含水率、易溶盐与土壤水氢氧同位素在垂向上呈现旋回变化，剖面中土壤Cl-含量与含水量成正相关；0～1.6 m为蒸发影响带，1.6～8.0 m为土壤水向下运移带，8.0 m以下为潜水影响带。从土壤水中氢氧同位素及Cl-含量信息来看，荒漠区土壤水来源于大气降水的补给。旋回中Cl-含量极低值与δD与δ18O极贫值相对应，δD值贫化峰值为-124.10‰～-97.39‰，荒漠区土壤水来源于冬季大气降水或降雪的入渗补给。

关键词: 土壤水, 稳定同位素, 运移规律, 补给来源, 准噶尔盆地

Abstract: Abstract：Soil water is the basis of all terrestrial plants in desert area. Investigation on the migration patterns of soil water is necessary for identifying the recharge sources of soil water and for the ecological regeneration in desert area. In this paper, the origin and migration patterns of soil water in a desert area in the southern marginal zone of the Junggar Basin were investigated based on measuring soil moisture content, stable isotopes (δD and δ18O) of soil water and soluble salt ions. The results indicated that the vertical profiles of stable isotopes, water content and soluble salt ions of soil water were in a cyclic variation. The Cl- composition in soil was positively correlated to soil moisture content. The influencing depth of evaporation was 0-1.6 m; soil water in a deep range of 1.6-8.0 m moved downward, and soil water below 8.0 m was influenced by groundwater. The vertical variations of stable isotopes and Cl- composition in soil water indicated that soil water originated from precipitation in desert area. The low values of Cl- composition corresponded to the depleted values of δD and δ18O; δD of soil water varied from -124.10‰ to -97.39‰, which suggested that soil water originated from precipitation or snow melt winter.

Key words:

soil water, stable isotope, migration pattern, recharge source, Junggar Basin

孙芳强，尹立河，马洪云，张俊，王晓勇，董佳秋，贺帅军. 准噶尔盆地南缘土壤水运移特征及其补给来源识别[J]. 干旱区研究, 2017, 34(6): 1271-1277.

SUN Fangqiang,YIN Lihe,MA Hongyun,ZHANG Jun,WANG Xiaoyong,DONG Jiaqiu,HE Shuaijun. Identification of Soil Water Migration and Recharge Sources in The Southern Marginal Zone of the Junggar Basin, China[J]. , 2017, 34(6): 1271-1277.

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