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冰川冻土  2005 

黑河下游土壤和地下水盐分特征分析

, PP. 890-898

Keywords: 额济纳三角洲,土壤盐分特征,地下水化学,电导率

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Abstract:

根据405个土壤样品和101个水样,分析了黑河下游土壤盐分分布规律以及与地形地貌部位、地下水水化学的关系.结果表明额济纳三角洲地区的土壤具有质地粗、含盐量高、盐分表聚性强的特征,该地区呈现盐碱化和沙漠化严重、可利用土地资源骤减、生态环境恶化的状况.在所有剖面上盐分的分布呈现漏斗型分布,土壤中盐分随地形变化较为复杂,但与地下水化学变化相一致.地下水矿化度普遍比较高,大多数地区的矿化度在800~3000mg·L-1之间变化;水化学类型主要有HCO3·SO4-Na、Cl·SO4-Na(Ca)、HCO3·Cl-Na(Ca)SO4·Cl-Na和SO4·Cl-Na(Ca-Mg).地下水矿化度的高低与补给源的距离远近密切相关,在河岸附近的矿化度变化幅度较小;在远离河道地区,随离岸距离的增减而升降,体现了矿化度的高低主要依赖于上游补给水量变化.

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