准噶尔盆地南缘土壤水运移特征及其补给来源识别

发布时间：2018-02-01 13:58

  本文关键词： 土壤水 稳定同位素 运移规律 补给来源 准噶尔盆地　出处：《干旱区研究》2017年06期 　论文类型：期刊论文

【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、δ~(18)O)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δ~(18)O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。
[Abstract]:In desert region, soil water is the basis for the survival of all terrestrial plants. The recharge sources of soil water in desert area are identified and the mechanism of soil water migration is explored. It is necessary for ecological restoration of desert region. The moisture content, soluble salt ion and stable isotope (未 D, 未 ~ (18) O) of soil water in unsaturated zone of desert region are measured and analyzed. The recharge sources and transport mechanism of soil water in desert region were studied. The results showed that soil moisture content, soluble salt and hydrogen and oxygen isotopes of soil water in desert region showed a cyclic change in vertical direction. There was a positive correlation between soil Cl- content and water content in the profile. 0 ~ (1.6 m) is the evaporation influence zone (1.6 ~ 8.0 m) and below (8.0 m) is the phreatic zone. The information of hydrogen and oxygen isotopes and Cl-content in soil water is considered. The soil water in desert area is derived from the recharge of atmospheric precipitation. The very low value of Cl- content in the cycle corresponds to the extremely poor value of 未 D and 未 ~ (18) O. The peak value of 未 D dilution is -124.10 鈥，

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