区域盐渍化土壤表层水盐变化特征及空间变异分析

Characteristics and Spatial Variability of Surface Soil Salinity and Moisture in Saline Area

表层土壤水盐的变化特征和空间变异性是研究改良土壤盐渍化的基础。将试验与统计学结合,分析宁夏银北试验区0~25 cm土层的水盐变化、空间变异性。结果表明,春夏季表层土壤水分含量、盐分含量总体随时间逐渐增大;水分变异系数处于中等变异,盐分变异系数处于弱变异区间内。通过统计计算,认为试验测定数目是达到精度要求的。利用Matlab软件拟合半方差函数求参,显示出土壤水分的空间自相关程度要明显高于土壤盐分。

The characteristics and spatial distribution of surface saline soil is important to study in Yinbei area of Ningxia Province. This paper uses the methods of geographic statistics to analyze the variation of soil water（ 0- 25 cm） and salt,spatial variability in experimental plots. The results show that surface soil moisture content and salt content was gradually increased over time in summer. Second,the coefficient of variation of soil moisture is higher than the soil salt＇s. According to statistical calculation,the number of test measurement is to achieve the required precision. Last,the spatial autocorrelation of soil moisture level is significantly higher than that of soil salinity through adopting Matlab software parameters by fitting semivariogram.