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论文以张家港市耕层土壤有机质(Soil organic matter,SOM)为目标变量,通过网格布点建立11种样点密度梯度,运用经典统计学和地统计学方法研究其空间特性随布点密度变化的趋势规律。结果表明,各密度下SOM的变异系数稳定在21.70%~23.12%之间,表现出中等程度变异;随着布点密度降低,SOM的块基比和分维数分别由37.52%、1.838波动降至18.70%、1.714,Moran’s I则由0.485起伏升高至0.857,相应地其空间变异中结构变异组分增多、随机变异贡献减少,空间自相关性也逐渐增强;SOM呈现西南—东北递减分布,随着样点密度减小,其空间格局趋于简化。论文以布点密度为视窗,揭示了SOM的多重空间尺度特征,可为解析土壤属性的层级结构提供参考依据。
In this paper, soil organic matter (SOM) was used as the target variable in Zhangjiagang city. 11 kinds of sample density gradients were established by using the grid distribution points. The spatial and temporal distributions of the spatial distributions were studied by using classical statistics and geostatistics methods law. The results showed that the coefficients of variation of SOM varied from 21.70% to 23.12% at various densities, showing a moderate degree of variation. With the decrease of spot density, the SOM base and fractal dimensions decreased from 37.52% and 1.838, respectively 18.70%, 1.714, Moran’s I increased from 0.485 to 0.857, correspondingly, the structural variation components of spatial variation increased, the contribution of random variation decreased, and the spatial autocorrelation increased gradually. SOM showed a decreasing distribution from southwest to northeast, With the sample density decreases, the spatial pattern tends to be simplified. This dissertation reveals the SOM’s multiple spatial scale features by using cloth density as a window, which can provide reference for the analysis of the hierarchical structure of soil attributes.