Reference area division for background point arrangement in soil environmental monitoring in Henan Province
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摘要: 以河南省1;20万区域地球化学水系沉积物测量和河南省1;25万土地质量地球化学调查数据为基础,结合河南省土壤母质图,按照地球化学背景的定义,应用统计学方法,通过迭代剔除异值离群数据,按均值±2倍离差分别求出不同母质类型区域内的Cd、As、Pb、Hg、Cr等5种重金属的背景区间值。根据每个元素的背景区间值,分别抽取数据点位,利用ArcGIS软件对数据点位位置进行网格提取,形成河南省背景点位布设参考区域,为河南省土壤生态环境监测背景点位优化提供了技术依据。Abstract: This study aims to determine the reference areas for the arrangement of background points in soil environment monitoring in Henan Province. Firstly,based on the data of 1;200,000 regional geochemical stream sediment surveys and 1;250,000 land quality geochemical surveys of Henan Province as well as the map of soil parent materials of Henan Province, outliers were eliminated using iteration and a statistical method according to the definition of geochemical background. Then the background interval values of five heavy metals (i.e.,Cd, As, Pb, Hg, and Cr) in parent materials of different types were calculated according to the ±2 deviationof the mean. Finally, data points were extracted according to the background interval values of each element and then the grid of the data points was extracted using the software ArcGIS. In this way, the reference areasfor the background points layout in Henan Province were formed. This study will provide technical bases for the optimization of background points in the soil environment monitoring in Henan Province.
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Key words:
- soil environmental monitoring /
- background points /
- regional division
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