区域土壤Cr含量空间分布影响因子及尺度效应研究

doi:10.19741/j.issn.1673-4831.2021.0790

摘要/Abstract

摘要： 铬元素(Cr)是典型有毒有害重金属元素，其在土壤中的含量与自然条件和人类活动有着密切联系。基于江宁经济技术开发区土壤Cr含量、土地利用类型、土壤类型、高程和坡度等资料，采用信息熵原理定量研究土壤Cr含量与各影响因子之间的空间相关性，分析不同空间尺度条件下各影响因子的尺度效应，确定各空间尺度上影响土壤Cr含量分布的关键因子。结果表明，不同尺度上各影响因子与土壤Cr含量空间相关性排序依次为:在大尺度(江宁经济技术开发区)上，土地利用类型>土壤类型>高程>坡度；在中尺度(牛首山河流域)上，高程>坡度>土壤类型>土地利用类型；在小尺度(牛首山河支流流域)上，高程>土壤类型>坡度>土地利用类型。研究结果可为区域土壤重金属污染防治决策及尺度效应研究提供参考。

关键词: 土壤, 重金属铬, 影响因素, 空间相关性, 尺度效应

Abstract: Chromium (Cr) is a typical toxic and hazardous heavy metal element. Its content in soil is closely related to natural conditions and human activities. Based on the data of Cr soil content, land use types, soil types, elevation and slope of Jiangning Economic and Technological Development Zone, the spatial correlation between Cr content in soil and various influencing factors is quantitatively studied using the principle of information entropy, and thus, the scaling effects are analyzed to identify the key factors for the distribution of Cr soil content at different spatial scales. The key factors affecting the distribution of Cr content in soil at different spatial scales are determined. The results show that at the large scale (over the Jiangning Economic and Technological Development Zone), the significance ranking of factors is land use type>soil type>elevation>slope; at the medium scale (the Niushoushan River basin scale), the order is elevation>slope>soil type>land use type; at the small scale (the tributary basin of Niushoushan River scale), elevation is most important, followed by soil type, slope, and land use type. This study can provide references for future decision-making on prevention and control of regional soil heavy metal pollution and for researches on the scaling effects of the key impact factors.

Key words: soil, heavy metal chromium, impact factor, spatial correlation, scaling effect

中图分类号:

X53
X142

李秀霞, 吴腾. 区域土壤Cr含量空间分布影响因子及尺度效应研究[J]. 生态与农村环境学报, 2022, 38(9): 1122-1128.

LI Xiu-xia, WU Teng. Study on Impact Factors and Scaling Effect of Spatial Distribution of Cr Content in Regional Soil[J]. Journal of Ecology and Rural Environment, 2022, 38(9): 1122-1128.

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