大面积农田土壤中重金属污染的空间分布及生态风险定量快速初步评价OA

In order to explore the feasibility and accuracy of hyperspectral estimation of soil heavy metal con-tent,to quickly and accurately assess heavy metal content in the farmland soil of the study area,and to evaluate the soil cadmium and arsenic pollution,this research uses measured data and hyperspectral data to develop rele-vant models.In Xushe Town,Yixing City,22 farmland soil samples were collected and their Cd and As con-tent were determined.At the same time,combined with HJ1A HSI hyperspectral data,a quantitative estima-tion model of soil heavy metal content was constructed.A comprehensive evaluation of heavy metal pollution levels in farmland soil in Xushe Town was conducted by calculating the single factor index and Nemeiro compre-hensive pollution index.The results showed that the Cd content in 3 out of the 22 farmland soil samples exceeded the national risk control threshold for farmland soil pollution,and the As content did not exceed national standards.The single-factor pollution index indicates that the As content in farmland soil is within the clean range,48.62%is in the lightly polluted range.The Nemeiro Comprehensive Pollution Index indicates that 8.73%of farmland soil in Xushe Town falls within the lightly polluted range.Our results suggest that,hyperspectral data can rapidly estimate heavy metal content in soil and effectively assess the extent of heavy metal pollution.