黄河三角洲地区土壤容重空间变异性分析

以黄河三角洲地区典型区域作为研究对象,运用传统统计学和地统计学相结合的方法研究了不同土层土壤容重的空间变异特征。结果表明:研究区各层土壤表现出一定的紧实趋势,土壤容重均属于弱变异强度。受结构性与随机性因素的共同作用,土壤容重均表现为中等的空间相关性。分维数分析表明,各层土壤容重的空间依赖性小,含黏层厚度与分布的不均一性是引起其空间异质性的关键原因。Kriging插值结果表明,土壤容重的空间分布与土壤质地密切相关,不同层次土壤容重在一定范围内表现出相似的空间分布规律。进一步的相关性分析表明各层土壤容重间存在极显著的正相关关系。通过研究不同层次土壤容重的空间变异性,获取区域土壤容重空间分布图,为该地区中、低产地及障碍土壤的分区管理和治理改良提供一定的参考依据。

Spatial Variability of Soil Bulk Density in the Yellow River Delta

Spatial variability of soil bulk density for various layers was measured and analyzed by using traditional statistics and geo-statistics,which was performed in characteristic field in the Yellow River Delta.The results indicate that soil samples for all layers showed compaction trend to some extent,and the variation in bulk density for all layers was rather weak.Soil bulk density all exhibited moderate spatial autocorrelation resulting from compound impact of structural and stochastic factors.Fractal dimension proved that bulk density for all layers showed weak spatial dependency,and the variability of claypan in depth and distribution was the crucial reason of resulting in the spatial heterogeneity of bulk density.The spatial distribution maps interpolated by Kriging interpolation showed that spatial distribution of salinity was closely related to soil texture,and bulk density for all layers exhibited the similarity in spatial distribution in a certain range.The further correlation analysis indicate that soil bulk density for all layers was significantly correlated with each other.The spatial distribution maps of bulk density,which were obtained through the study on spatial variability,can serve as a scientific basis for the regional management,harness and amelioration of moderate-and-low-yield farmlands and obstacle soils in the Yellow River Delta.