基于区域变量理论,在GPS和GIS技术支持下,通过地统计学的半变异函数和Kriging空间插值,以察布查尔县为例,定量分析伊犁河谷不同层次土壤盐分的空间异质性.结果表明:0～20 cm、20～40 cm、60～80 cm层土壤盐分的半变异函数符合球状模型,40～60 cm层符合高斯模型.不同层次土壤盐分之间的空间自相关范围具有明显的差异,由表层至深层,土壤盐分的自相关范围逐渐增大.土壤盐分的空间榕局分析表明,在水平方向上,研究区各层土壤盐分的高值区集中分布在地势较为低洼区域;在垂直方向上,土壤表层(0～20 cm)盐分含量最高,向深层逐渐减少.%The spatial variability of soil salinity in different soil layers, in the Iii River Valley as an example, was quantificationally analyzed by means of GPS and GIS technology, based on the regionalized variable theory, using the semivariograms and the Kriging method of geostatistics. The results showed that the semivariograms of soil salinity in 0 ～20 cm, 20 ～ 40 cm and 60 ～ 80 cm fitted the spherical model while the semivariograms of soil salinity in 40 ～ 60 cm fitted the Gause model. The autocorrelation range of soil salinity in different soil layers had apparent differences, and the autocorrelation renge of soil salinity increased from the top layer to the deeper ones. Analysis of the spatial pattems of soil salinity indicated that high values of soil salinity were mainly distributed on the lower-lying areas. On the vertical direction, the salinity of surface soil (0 ～ 20 cm) was the highest and it decreased gradually with the increase of soil depth.
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