历史遗留矿区农田土壤重金属输入输出平衡研究OA北大核心CSTPCD
Input and output balance of heavy metals from an abandoned mining area in farmland soils
为探究矿区农田土壤重金属输入与输出通量特征,本试验以长江下游某典型遗留硫铁矿区小流域为研究区域,分析研究区土壤重金属(Cd、Pb、Cu、Zn、Cr)的空间分布特征,并设置监测田块,核算研究区土壤重金属输入与输出通量及构建含量预测模型.结果表明:硫铁矿区小流域土壤重金属污染元素主要是Cd、Cu、Zn,分别有5.88%、33.99%和13.07%的土壤样品超过农用地土壤污染风险筛选值(GB 15618-2018),水稻籽粒中Cd和Cr超过《食品安全国家标准 食品中污染物限量》(GB 2762-2017)中限量值的点位比例分别为36.00%和13.33%;土壤Cd、Cu、Zn的空间分布呈现上游矿坑周边及下游水库入口处含量高的趋势,且三者间存在显著正相关关系(P＜0.01),而Pb和Cr的空间分布与之不同,其中Cr与其他元素呈现负相关关系;根据监测田块核算,研究区Cd、Cu、Pb、Zn、Cr的年输入通量分别为15.62、86.63、292.92、325.89、90.30 g·hm-2·a-1,年输出通量分别为2.85、0.32、37.20、196.15、5.94 g·hm-2·a-1,土壤重金属呈现不断累积的特征;预测Cd和Cu在未来20a间含量会明显增加,Pb、Zn、Cr反之.综上,加强上游矿区的水源治理,提倡下游农田科学灌溉,减少灌溉水中Cd等重金属输入是土壤重金属污染源头防控的关键.
A small watershed of an abandoned pyrite mining area in the lower reaches of the Yangtze River was selected as the study area to explore the characteristics of heavy metals input and output fluxes in farmland soil of mining areas.We analyzed the spatial distribution characteristics of heavy metals(Cd,Pb,Cu,Zn,Cr)in soils by setting up monitoring fields to calculate the input and output fluxes of heavy metals in the soil of the study area and construct a content of heavy metals prediction model.The results showed that:Cd,Cu,Zn were the main heavy metal pollutant elements in the soil of the small watershed in the pyrite mining area,with 5.88%,33.99%,and 13.07%of the soil samples exceeding the risk screening values for soil pollution in agricultural land(GB 15618-2018),respectively.The proportions of Cd and Cr in rice grains exceeding the"National Food Safety Standard for Pollutant Limits in Food"(GB 2762-2017)were 36.00%and 13.33%,respectively.The spatial distribution of Cd,Cu,Zn in soil showed a trend of high content around the upstream mining pit and at the entrance of the downstream reservoir,and there was a significant positive correlation between them(P＜0.01),while the spatial distribution of Pb and Cr were different,and Cr showed a negative correlation trend with the other elements.According to monitoring field calculating,the total annual input fluxes of Cd,Cu,Pb,Zn,Cr in paddy soils were 15.62,86.63,292.92,325.89,90.30 g·hm-2·a-1,respectively,and the total annual output fluxes were 2.85,0.32,37.20,196.15,5.94 g·hm-2·a-1,respectively.Soil heavy metals exhibited a continuous accumulation characteristic.It was predicted that the content of Cd and Cu would significantly increase in the next 20 years while the content of Pb,Zn,Cr would decrease.In conclusion,strengthening water source management in upstream mining areas,advocating scientific irrigation in downstream farmland,and reducing the input of heavy metals such as Cd into irrigation water is crucial for the prevention and control of soil heavy metal pollution sources.
赵归梅;吴秋梅;胡文友;黄标;祖艳群;李元;湛方栋
云南农业大学资源与环境学院,昆明 650201||土壤与农业可持续发展国家重点实验室(南京土壤研究所),南京 210008土壤与农业可持续发展国家重点实验室(南京土壤研究所),南京 210008||中国科学院大学中丹学院,北京 101408云南农业大学资源与环境学院,昆明 650201
环境科学
硫铁矿区重金属空间分布输入-输出通量预测模型
pyrite mining areaheavy metalspatial distributioninput and output fluxespredictive model
《农业环境科学学报》 2024 (007)
1492-1502 / 11
江苏省重点研发计划项目(BE2021717):江苏省农业科技自主创新资金项目[CX(21)2034];中国科学院青年创新促进会会员项目(2019312)Key-Area Research and Development Program of Jiangsu Province,China(BE2021717);Agricultural Science and Technology Independent Innovation Fundation of Jiangsu Province,China[CX(21)2034];Youth Innovation Promotion Association of the Chinese Academy of Sciences(2019312)
评论