伊犁新垦区土壤盐分垂直分异特征研究

土壤盐分垂直分异特征的定量研究是农业生产、管理以及环境治理的重要内容。采用经典统计分析和层次聚类分析等方法,选择Pearson相关系数和欧氏距离作为聚类统计量,分析伊犁新垦区土壤剖面盐分的垂直分布特征。结果表明:伊犁新垦区土壤盐分存在很强的变异性,各层盐分的变异系数皆大于1,土壤剖面可分为表聚型盐分剖面、中聚型盐分剖面和底聚型盐分剖面等三种类型,根据盐分的数值大小,进一步可划分为非盐化土、表聚盐化土、中聚盐化土和底聚盐化土等四种类型,各占剖面总数的66%、5%、10%和19%。空间上伊犁新垦区土壤盐分垂直变化特征的差异性大,四种类型的盐化土皆有所分布,中聚盐化土和底聚盐化土分布的地区容易发生次生盐渍化,是农业生产和环境治理需要重点关注的区域。

Vertical characteristic of soil salts in newly reclaimed area in Yili

The quantitative study of vertical characteristic of soil salinity profiles is important for agricultural production,agricultural management and environmental governance.We used statistical analysis and hierarchical cluster analysis,and chose Euclidean distance and Pearson correlation coefficient as the clustering statistics to analyze the vertical distribution of soil salinity profiles in newly reclaimed area in Yili.The results showed that soil salinity exhibits strongly variation of every profile in newly reclaimed area in Yili,of which variation coefficients are greater than 1.Soil profiles can be classified into top-soil,mid-soil and sub-soil types.According to the numerical value of salt,soil profiles can be classified as four types of non-salinization soil,top-soil salinization,mid-soil salinization and sub-soil salinization,accounting for 66%,5%,10% and 19% of the total respectively.In newly reclaimed area in Yili,the vertical variation of soil salinity differences in the spatial distribution,which includes all four types of soil salinity vertical variation.Secondary salinization areas easily occur in the areas with the mid-soil salinization and sub-soil salinization profiles,which needs to be focused on for agricultural production and environmental management.