黑河下游土壤盐分分布特征

发布时间：2018-02-27 04:12

本文关键词： 土壤盐分聚类分析地统计分析黑河　出处：《中国沙漠》2017年06期 　论文类型：期刊论文

【摘要】：采用黑河下游面域土壤信息调研数据,结合层次聚类和地统计分析等方法,探讨黑河下游土壤盐分在水平方向和垂直方向上的变异特征,揭示黑河下游土壤盐渍化的程度和状态。结果表明:研究区土壤盐分表聚特征明显。土壤盐分及离子组分含量存在很强的变异性,变异系数0.42~1.99。黑河下游土壤盐渍化类型主要为氯化物-硫酸盐型,土壤盐渍化程度较为严重,盐土占比高达42.87%。从土壤盐分在水平方向上的变异特征来看,表土层土壤全盐在一定的区域范围内具有空间结构特征,符合球状模型分布,空间分布表现为斑块状格局。从土壤盐分在垂直方向上的变异特征来看,研究区土壤盐分剖面类型可分为表聚型、均匀型、振荡型和底聚型。
[Abstract]:The variation characteristics of soil salinity in horizontal and vertical directions in the lower reaches of Heihe River were studied by using the investigation data of soil information in the lower reaches of Heihe River and the methods of hierarchical clustering and geostatistical analysis. The results showed that the characteristics of soil salt accumulation were obvious in the study area, and there was strong variability in soil salinity and ion content. The soil salinization type in the lower reaches of Heihe River is mainly chlorine-sulfate type, the soil salinization degree is more serious, the proportion of salt soil is as high as 42.87.The variation characteristics of soil salt content in horizontal direction are as follows: (1) the soil salinization in the lower reaches of Heihe River is mainly chlorine-sulfate type, and the soil salinization degree is relatively serious. The total salt of the topsoil layer has the spatial structure characteristics in a certain region, which is in accordance with the spherical model distribution, and the spatial distribution is the patch pattern. From the variation of soil salt in the vertical direction, the soil salt distribution is similar to that of the soil salt distribution in the vertical direction. The soil salt profile types in the study area can be divided into apparent type, uniform type, oscillatory type and bottom type.
【作者单位】：中国科学院西北生态环境资源研究院内陆河流域生态水文重点实验室;中国科学院大学;渭南师范学院农商学院/陕西省河流湿地生态与环境重点实验室;
【基金】：国家自然科学基金项目(31370466)
【分类号】：S156.41

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