多重密度布点对土壤有机质空间特性的解析

发布时间：2018-02-14 20:06

本文关键词： 土壤有机质布点密度空间变异尺度　出处：《自然资源学报》2016年12期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:In this paper, the soil organic matterssom of topsoil in Zhangjiagang City is taken as the target variable, and the density gradient of 11 kinds of sample points is established by grid distribution. Using classical statistics and geostatistics to study the trend of spatial characteristics with distribution density. The results show that the coefficient of variation of SOM is between 21.70% and 23.12% at different densities, showing moderate variation. The ratio of block to base and fractal dimension of SOM decreased from 37.52 ~ 1.838 to 18.70 ~ (1.714) Morans I from 0.485 to 0.857 with the decrease of point density. Accordingly, the structural variation components increased and the contribution of random variation decreased in spatial variation. Spatial autocorrelation also increases gradually. The spatial pattern tends to be simplified with the decrease of the sample density, and the spatial scale characteristics of SOM are revealed by using the distribution density as a window. It can provide a reference for analyzing the hierarchical structure of soil attributes.
【作者单位】：西北农林科技大学资源环境学院;中国科学院南京土壤研究所;
【基金】：国家科技基础性工作专项项目(2014FY110200A08)~~
【分类号】：S153.6

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