农用地土壤重金属污染评价及来源解析  

Assessment and source analysis of soil heavy metal pollution in agricultural land

作　　者：郑雪云 张金兰[1] 胡晋 刘姵伶 郭云 李嘉怡 高照忠[1] 申晨 ZHENG Xue-yun;ZHANG Jin-lan;HU Jin;LIU Pei-ling;GUO Yun;LI Jia-yi;GAO Zhao-zhong;SHEN Chen(Institute of Remote Sensing Information,Guangdong Vocational and Technical College of Industry and Trade,Guangzhou 510510,China)

机构地区：[1]广东工贸职业技术学院测绘遥感信息学院,广东广州510510

出　　处：《环境生态学》2023年第8期9-14,共6页Environmental Ecology

基　　金：2023年广东省科技创新战略专项(pdjh2023b0824);广东工贸职业技术学院培英育才计划项目(粤工贸院[2019]142号);2022年广东工贸职业技术学院科研项目(2022-ZKT-04)资助。

摘　　要：以广东省梅州市五华县棉洋镇农用地为研究对象,测定农业用地土壤样品Cd、Hg、Cr、As、Pb重金属含量。通过反距离权重(IDW)的插值模型进行土壤重金属空间分布预测分析,采用内梅罗综合污染指数对棉洋镇重金属污染状况进行全面评价,采用地累积指数法和潜在生态风险指数法对土壤重金属进行生态风险评价,运用主成分分析法和相关性分析法探究土壤重金属的主要来源。结果表明:土壤中As、Cd、Cr、Hg、Pb的平均质量分数分别为7.18、0.13、26.03、0.10和33.87 mg/kg,均低于农用地土壤污染风险筛选值,土壤环境质量总体属于清洁水平,重金属污染潜在生态风险较低。其中,Hg、As、Cr元素在土壤中的积累主要受自然因素(成土母质)的影响,Pb、Cd元素不仅受成土母质影响,还受人类活动影响。Taking the farmland in Mianyang Town,Wuhua County,Meizhou City,Guangdong Province as the study object,concentration of Cd,Hg,Cr,As,Pb in agricultural land soil were detected.Spatial distribution prediction of soil heavy metals was analyzed by interpolation method model with inverse distance weights(IDW).Heavy metals pollution status in Mianyang Town were comprehensively evaluated through Nemero comprehensive pollution index method.Ecological risks of soil heavy metals were evaluated using the ground accumulation index method and the potential ecological risk index method.Principal component analysis and correlation analysis were used to explore the main sources of soil heavy metals.The results showed that,the average mass fractions of soil As,Cd,Cr,Hg and Pb were 7.18,0.13,26.03,0.10 and 33.87 mg/kg respectively,which were all below the risk screening value for soil contamination of agricultural land.The soil environmental quality was at generally clean level and the potential ecological risk of heavy metal pollution was relatively law.Hg,As and Cr are mainly affected by natural factors(soil parent material),and the accumulation of Pb and Cd elements in soil is not only affected by soil parent material,but also affected by human activities.

关 键 词：土壤重金属 空间分布 主成分分析 生态风险评价 重金属来源 

分 类 号：X71[环境科学与工程—环境工程] X825