苏打碱化土壤盐分离子与相关性分析

Distribution Characteristics of Ions in Sodic Soil and Correlation Analysis

选取典型苏打碱化土壤剖面,分析了0～200cm深度主要盐分离子(Ca2+、Mg2+、Na+、K+、CO32-、HCO3-、Cl-和SO42-)的垂直分布规律。对各离子之间的相关性进行了统计分析。结果表明,测试土样离子以Na+和HCO3-离子为主,其剖面分布规律是表层含量较低,在80cm左右逐渐增至最大值,其后离子含量随深度而降低,至160cm以下则又随深度而增加,即在整个土壤剖面上大致呈倒"S"曲线分布。CO32-、HCO3-、Cl-与Na+,CO32-、HCO3-与Cl-之间均是相关系数大于0.80的极显著相关;除K+离子外,其它7个离子间均具有显著相关性,这表明该苏打碱化土壤盐分离子组成具有复杂性的特点。

Vertical distribution characteristics of Ca^2＋, Mg^2＋, Na^＋, K^＋, CO3^2-, HeO3^-, Cl^- and SO4^2- in sodic soil were described and correlation Analysis of these ions was conducted. Results show that the major ions of this soil are Na^＋ and HCO3^-. The ion content in upper soil layer is low, and the maximal value was found in the 20-80cm soil layer. It is reduced in 80-160cm layer, but increased again in the 160-200cm soil layer. Correlation coefficients between Na＋ and CO3^2- or HCO3^- or Cl^- as well as those between Cl and CO3^2- or HCO3 exceed 0.80.