天津市平原土壤微量元素含量的空间自相关研究
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* 国家教委青年优秀教师基金


SPATIAL AUTOCORRELATION ANALYSIS OF TRACE ELEMENT CONTENTS OF SOIL IN TIANJIN PLAIN AREA
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    摘要:

    空间自相关是区域化变量的基本属性之一,而空间自相关统计可用于检测研究区域内变量的分布是否具有空间结构.本研究以天津市平原区土壤微量元素为例,采用Moran's I统计量,研究了土壤微量元素含量的空间自相关关系、空间自相关的方向性、空间自相关与距离的关系以及不同方向的自相关与距离的关系.结果证实在本研究的采样密度下(平均约300平方公里一点),天津市平原区多数土壤微量元素含量表现出显着的正空间自相关;土壤微量元素含量的空间自相关关系在受表生与人为作用影响较大的A层最为强烈;人为活动改变了部分微量元素含量(汞、镉、铅、锌、砷)在研究区土壤中,尤其是表土中原有的空间分布结构特征.

    Abstract:

    Spatial sutocorrelation is one of the basic characteristics of regionalized variable, and statistics based on spatial autocorrelation can be used to test if the distribution of a variable in a two-dimentional space follows a certain pattern or at random. Values of Moran's I of trace element contents in soil of Tianjin plain area were calculated. The spatial sutocorreiation characteristics, the directional characteristics of spatial autocorrelation, the relationship between spatial autocorrelation and lag of sapmling and the relationship between spatial autocorrelation in different directions and lag of sampling were investigated.Under the sampling density of 300 km2 per sample, significant by positive spatial sutocorrelations were detected for most trace elements studied. The most significant spatial autocorrelation was found in horizon A where the original distribution of the elements had been modified remarkably by natural forces and human activities. The spatial structure characteristics of Hg, Cd, Pb, Zn, and As contents in surface soil were further altered by pollution and agricultural practice.

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张朝生,陶澍,袁贵平,刘水.天津市平原土壤微量元素含量的空间自相关研究[J].土壤学报,1995,32(1):50-57. Zhang Chaosheng, Tao Shu, Yuan Guiping, Liu Shui. SPATIAL AUTOCORRELATION ANALYSIS OF TRACE ELEMENT CONTENTS OF SOIL IN TIANJIN PLAIN AREA[J]. Acta Pedologica Sinica,1995,32(1):50-57.

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  • 在线发布日期: 2013-02-25
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