基于地统计学的田间尺度下土壤盐分离子空间变异研究

土壤中可溶性盐的分析是研究盐渍土盐分动态监测与盐渍化防治的重要基础工作。利用地统计学方法研究了田间尺度下土壤盐分离子的空间变异特征,运用Kriging插值绘制了盐分离子的空间分布图。结果表明:除Cl-和Ca2+属强变异强度外,其他离子均具有中等变异强度;受结构性因素和随机性因素的共同作用,除Ca2+与总盐外,其余各盐分离子均具有中等强度的空间相关性,自相关距差异不大;Kriging插值图表明大部分盐分离子的空间结构性都较好,中部的离子含量明显低于其他方向。研究结果为孔雀河灌区盐渍化土壤的防治、改良和利用提供了理论基础。

Study on spatial variability of soil salt ions under farmland scale based on geo-statistics method

The analysis of soluble salt in soil is an important foundation work in research of salt dynamic monitoring of salinized soil and prevention of soil salinization.This paper studied the spatial variability of salinization by geo-statistics method,and made the spatial distribution map of salt contents by using Kriging method.The results indicated that except Cl^- and Ca²⁺ belongs to strong spatial variation of strength, other ions possess moderate spatial variation of strength; apart from Ca²⁺ and total salt ,other salt ions exhibit moderate spatial correlation and shows little difference in the autocorrelation distance of each salt ion due to the joint action of structural and stochastic factors; the spatial structure of most salt ions is good as showed in Kriging interpolation maps,ions content in the middle was significantly lower than that in other directions. The results can provide theoretical basis for the prevention, improvement and utilization of salinized soil in the irrigation region of Kongque river.