典型干旱区土壤盐分空间异质性对比研究

Comparison of Different Methods for Spatial Distribution of Soil Salinity in Typical Arid Area

研究目的在于采用不同方法研究典型干旱区土壤盐分空间分布,并对比预测精度。研究方法:通过对研究区域进行移动式磁感调查,获取大地表观电导率信息,经校正解译成土壤盐分信息,拟合最优半方差函数,分别利用克里格插值、条件模拟、径向基函数法以及栅格运算方法对土壤盐分空间分布进行预测。研究结果表明:比较四种方法预测精度,条件模拟和克里格插值具有良好的预测精度,径向基函数法和栅格运算方法误差较大。研究结论:通过对研究区域移动式磁感调查,结合条件模拟或克里格插值方法,可以快速而又比较准确的预测土壤盐分空间分布。

The purpose of this paper was to research the spatial distribution ol SOlI sanmty in a typmat arlu area wm~ several methods, and compare the prediction accuracy. The methods employed were the mobile electromagnetic （EM） survey which was operated with enough information of ECa, it could be interpreted into salinity information, the best-fit semi-variance models, which were for the utilization of Kriging interpolation, conditional simulation, RBF and raster calculator to predict the spatial distribution of soil salinity. The result indicated that, compared the accuracy of the four methods, the accuracies of condition simulation and kriging interpolation were favorable, while those methods of RBF and raster calculator had poor accuracy. It is concluded that spatial distribution of soil salinity could be obtained fleetly and accurately by mobile EM survey, combining with conditional simulation or kriging interpolation.