中国农业大学学报2024，Vol.29Issue(12)：279-289,11.DOI:10.11841/j.issn.1007-4333.2024.12.24
偏态分布下已知变异单元内土壤重金属采样数目确定方法研究
Study on the method of determining the sampling number of soil heavy metals in known variation units under skew distribution
摘要
Abstract
Determining the optimum sampling numbers(OSN)of heavy metals in soil is the premise and foundation for research of heavy metals in soil.It is one critical issue to achieve credible results when surveying heavy metals in soil and sustainable land use or remediation decisions.In this study,cadmium in farmland soil was taken as the research object.The data of Cd from 17 high-low variant units at different scales were collected by field sampling.The relationships between geometric standard deviation(GSD)and coefficient of variation(CV)were established by statistical and empirical theory.Based on the relationships,the method of determining the OSN of heavy metals in soil with skewed distribution was further derived.The results showed that:Compared with other methods,geometric standard deviation calculated by the method derived from statistical model was more accurate,and the OSN calculated by the proposed statistical model was closer to the exact sampling number;The mean error and relative deviation generated by the proposed statistical model were smaller,and the OSN calculated by the proposed statistical model in the high or low variation units was more accurate.The total calculation process of the proposed statistical model was simpler and faster.This study provides an effective method to determine the OSN of soil heavy metals in the decision unit with known CV.关键词
土壤重金属/偏态分布/变异系数/采样数目/模型Key words
soil heavy metals/skewed distribution/coefficient of variation/sampling number/model分类
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黄亚捷,贾凤超,崔艳智,周岩,李君超,刘海东..偏态分布下已知变异单元内土壤重金属采样数目确定方法研究[J].中国农业大学学报,2024,29(12):279-289,11.基金项目
黄河流域生态保护和高质量发展联合研究项目(2022-YRUC-01-050204) （2022-YRUC-01-050204）
