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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 cm6、0~80 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。土壤盐分的空间格局分析表明,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。
Based on the theory of regional variables, the spatial heterogeneity of soil salinity at different levels in the Ili Valley was quantitatively analyzed by means of geostatistical semi-variogram and Kriging interpolation with the support of GPS and GIS technology. The results showed that the semivariogram of soil salinity in 0 ~ 20 cm, 20 ~ 40 cm6 and 0 ~ 80 cm layers accorded with the spherical model, and the 40 ~ 60 cm layer was Gaussian model. The spatial autocorrelation ranges of soil salinity at different levels have obvious differences. From surface to deep, the range of soil salinity increases gradually. Spatial pattern analysis of soil salinity shows that in the horizontal direction, the high value areas of soil salinity in all layers of the study area are concentrated in the low lying areas. In the vertical direction, the salt content in the soil surface (0 ~ 20 cm) gradually decreases.