绿洲区域土壤盐渍化主要参数的空间异质性分析

Spatial variability of key parameters of soil salinization in oasis area

通过研究土壤盐渍化主要参数的空间异质性,反映绿洲不同程度盐渍化的空间分布。借助传统统计学、地统计学与野外实测数据相结合的方法,以渭库绿洲为例,分析土壤三个剖面层(0-10cm,10-30cm,30-50cm)盐渍化主要参数(电导率、含水量、含盐量、pH)的空间异质性。对研究区域各层土壤盐渍化的监测采样控制在95%置信水平、15%相对误差的可接受范围。研究表明:土壤盐分表聚强烈,呈现出东南高,西北低的盐渍化空间格局。土壤盐渍化严重威胁绿洲的生态安全,因此了解盐渍化空间分布,有利于土壤盐渍化的快速诊断,对进行合理的水资源灌溉利用,防治和改良土壤盐渍化具有科学指导意义。

The spatial heterogeneity of the main parameters of soil salinization can reflects the spatial distribution of different degree of salinization. With the method of classic statistics,geo statistics and combined with field survey data,the spatial heterogeneity of the electrical conductivity,water content,salt content and pH of three soil section layers（ 0-10 cm,10-30 cm,30-50cm） of Wei Ku were analyzed. The acceptable range of confidence level was controlled in the 95% and the relative error around 15% for each layer of soil salinization monitoring sampling in research area. Research shows that the soil salt surface accumulation is strong,salinization spatial pattern presents higher in the south-east and lower northwest. Oasis ecological security was threatened by soil salinization. Understanding spatial distribution of salinization is not only benefit for rapid diagnosis of soil salinization,but also has scientific significance to reasonable use of water resources,control and amelioration soil salinization.