改造后的沙丘地春季表层土壤水分空间变异性研究

A Study on Spatial Variability of Surface Soil Moisture of Sand Dune after the Reconstruction in Spring

【目的】为奇台县的防风治沙工程和沙漠植被建设提供参考。【方法】利用改造后的沙丘地和6种土地类型的实地测量数据,通过变异函数、Moran’s I系数、土壤水分等值线图探讨了改造后的沙丘地春季表层土壤水分的水平空间变异性及其原因。【结果】经种植梭梭改造后的沙丘地的土壤含水量呈现出3个明显与沙丘土壤水分不同的特点。(1)均值大于沙丘,土壤含水量接近于草地;(2)土壤水分半方差函数模型已表现为与沙丘水分的球状模型完全不同的指数模型,且变程小于样点间距,相关性显著;(3)土壤含水量等值线图等值线密集,并呈与梭梭林带走向一致的条带状分布。【结论】奇台县自2000年以来实行的防沙治沙已取得较大的成效。

【Objective and Method】The reformed sand dune and six land types of field measurement data were used to conduct comparison and analysis of the spring surface soil moisture special variation characteristics to provide reference for resisting wind and stabiliting sand engineering and establishing vegetation in desert.【Result】Results show that：there were 3 obvious characteristics which were different from dune soil,after reforming with planting sacsaoul on sand.（1）The average value was greater than dune,soil moisture content was close to meadow;（2）The model of soil moisture semi-variance function expressed as index model that was completely from spherical model of dune sand moisture and the range smaller than spacing between samples with significant relation;（3）The constant value line map of soil moisture showed it was dense and band state distribution is in the same direction of sacsaoul forest band.【Conclusion】The results showed that Qitai county since 2000 has made greater achievement in prevent and control desertification.