农业环境科学学报2024，Vol.43Issue(7)：1492-1502,11.DOI:10.11654/jaes.2023-0785
历史遗留矿区农田土壤重金属输入输出平衡研究
Input and output balance of heavy metals from an abandoned mining area in farmland soils
摘要
Abstract
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.关键词
硫铁矿区/重金属/空间分布/输入-输出通量/预测模型Key words
pyrite mining area/heavy metal/spatial distribution/input and output fluxes/predictive model分类
资源环境引用本文复制引用
赵归梅,吴秋梅,胡文友,黄标,祖艳群,李元,湛方栋..历史遗留矿区农田土壤重金属输入输出平衡研究[J].农业环境科学学报,2024,43(7):1492-1502,11.基金项目
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] （BE2021717）
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) （2019312）
Agricultural Science and Technology Independent Innovation Fundation of Jiangsu Province,China[CX(21)2034] （21）
Youth Innovation Promotion Association of the Chinese Academy of Sciences(2019312) （2019312）
