黄月美, 崔文刚, 李云路, 张宏泽, 刘绥华, 刘芳. 贵阳乌当区喀斯特地区耕地土壤的镉污染评价及空间分布特征[J]. 云南大学学报(自然科学版), 2022, 44(2): 298-305. doi: 10.7540/j.ynu.20210249
引用本文: 黄月美, 崔文刚, 李云路, 张宏泽, 刘绥华, 刘芳. 贵阳乌当区喀斯特地区耕地土壤的镉污染评价及空间分布特征[J]. 云南大学学报(自然科学版), 2022, 44(2): 298-305. doi: 10.7540/j.ynu.20210249
HUANG Yue-mei, CUI Wen-gang, LI Yun-lu, ZHANG Hong-ze, LIU Sui-hua, LIU Fang. The evaluation and spatial distribution characteristics of Cd pollution in cultivated soil in karst area of Wudang District, Guiyang[J]. Journal of Yunnan University: Natural Sciences Edition, 2022, 44(2): 298-305. DOI: 10.7540/j.ynu.20210249
Citation: HUANG Yue-mei, CUI Wen-gang, LI Yun-lu, ZHANG Hong-ze, LIU Sui-hua, LIU Fang. The evaluation and spatial distribution characteristics of Cd pollution in cultivated soil in karst area of Wudang District, Guiyang[J]. Journal of Yunnan University: Natural Sciences Edition, 2022, 44(2): 298-305. DOI: 10.7540/j.ynu.20210249

贵阳乌当区喀斯特地区耕地土壤的镉污染评价及空间分布特征

The evaluation and spatial distribution characteristics of Cd pollution in cultivated soil in karst area of Wudang District, Guiyang

  • 摘要: 为探究贵阳乌当区喀斯特地区耕地土壤的镉污染分布特征,在喀斯特地区耕地表层土壤中采集2503个样品,测定其Cd元素质量分数和pH值,使用统计方法和地统计理论对实测数据进行分析,运用Cd元素污染指数、土壤Cd污染综合累积指数和综合潜在生态危害评价方法分析该区域耕地土壤的Cd污染现状,应用主成分分析方法对污染来源进行探究. 结果表明:①全区耕地土壤Cd质量分数实测值的平均值为0.426 mg·kg−1,超过国家土壤重金属污染筛选值(0.400 mg·kg−1),但未超过贵州省的背景值(0.659 mg·kg−1);②研究区域Cd元素综合污染指数评价结果是轻度污染等级,土壤污染综合累积指数评价为安全等级,Cd对环境的威胁是轻度生态危害;③研究区Cd元素来源主要是自然成土母质,部分高污染点受人为干扰大.

     

    Abstract: In order to explore the distribution characteristics of Cd pollution in cultivated land soil in karst areas, 2503 samples were collected from the topsoil of cultivated land in Wudang District, so as to measure the mass fraction and pH value of Cd. Statistical methods and geo-statistical theory were used to analyze the measured data. The present situation of pollution in cultivated land soil in this area was evaluated by using pollution index of Cd, soil comprehensive pollution accumulation index and comprehensive potential ecological hazards of Cd. The principal component analysis method was used to explore the source of pollution. The results show that: ① The average value of the measured mass fraction of Cd in the whole region is 0.426 mg·kg−1, which exceeds the national soil heavy metal pollution screening value (0.400 mg·kg−1), but does not exceed the background value of Guizhou Province (0.659 mg·kg−1); ② The results of the regional comprehensive pollution index of Cd demonstrate a mild pollution grade; the soil comprehensive pollution accumulation index is evaluated as a safety grade; and the environmental threat of Cd is a mild ecological hazard; ③ Natural soil parent material is the main source of Cd in the study area, and some high pollution points are greatly caused by human activities.

     

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