基于地统计学的莱州湾南岸土壤盐分离子的空间变异性研究

Spatial Variability of Soil Salt Ions in the South Coast of Laizhou Bay Based on Geostatistics

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。以莱州湾南岸地区作为研究对象,利用地统计学的方法研究了该区土壤盐分离子的空间变异特征,并运用Kriging插值绘制了盐分离子的空间分布图。结果表明,除Cl-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,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;东西方向上各盐分离子都呈明显的2阶趋势效应,南—北方向上,除SO42-呈1阶趋势效应外,其他盐分离子都呈现明显的2阶趋势效应;Kriging插值图表明大部分盐分离子的空间结构性都较好,东部的离子含量明显低于其他方向。该研究结果为莱州湾地区盐渍化土壤的防治、改良和利用提供了理论基础。

Abstract The analysis of soluble salt in soil is an important foundation work in the research of salt dynamic monitoring of salinized soil and the prevention of soil salinization. This study chose the south coast of Laizhou Bay as the research object,measured the spatial variability of salt ions by using geostatistics ,and made the spatial distribution map of salt contents by using Kriging method. The results indicated that C1- showed strong spatial variability ,while other ions showed moderate spatial variability; each salt ions exhibited moderate spatial autocorrelation due to the joint action of structural and stochastic factors ,and little difference was observed in the autocorrelation distance of each salt ion; each salt ion showed double rank trend at east-west direction,s^t ions showed double rank trend on the north-south direction except for SO42- which showed one rank trend ; the spatial structure of most salt ions was good as showed in the Kriging interpolation maps,ions content in the east was significantly lower than in ther directions. The results provided theoretical basis for the prevention, amelioration and utilization of salinized soil in I.~izhou Bay area.