运用传统统计学和地统计学相结合的方法研究黄河三角洲地区表层土壤盐分、pH与含水量的空间变异特征。结果表明:土壤盐分较高且呈一定的碱化趋势;盐分与含水量为中等变异强度,pH为弱变异强度。受结构性与随机性因素的共同作用,盐分、pH与含水量均表现为中等空间相关性。分维数与Moran′s I系数分析均表明,盐分、pH与含水量的空间依赖性小,随机性因素是引起空间异质性的关键原因。Kriging插值与相关性分析表明,盐分和pH的分布存在着空间负相关性,且盐分与pH、含水量均呈显著负相关,盐分过高是导致pH降低的重要因素,含水量可为判断旱季表层土壤盐分高低提供一定参考。
The spatial variability of soil salinity,pH and moisture in the surface layer of the Yellow River Delta was analyzed by using traditional statistics and geo-statistics.The results indicate that soil salinity was generally high and showed the trend of alkalization to some extent,the variation in salinity and moisture was moderate while the variation in pH was rather weak.Soil salinity,pH and moisture all exhibited moderate spatial autocorrelation resulting from compound effect of structural and stochastic factors.Fractal dimension and Moran′s I coefficient both proved that soil salinity,pH and moisture showed weak spatial dependency,and stochastic factors were the crucial reason of resulting in the spatial heterogeneity of salinity,pH and moisture.The Kriging interpolation and correlation analysis showed that the distribution of soil salinity was inversely correlated with that of pH,and soil salinity showed negatively significant correlation with both pH and moisture,which signified that excessive salinity contributed to pH decrease and moisture could provide a reference for the diagnosis of salinity in the surface layer during the drought season.
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