Input-output inventory and risk early warning of heavy metal in farmland soil in Taihu Lake Basin,southern Jiangsu
In this study,a thorough inventory of heavy metal inflows and outflows in the agricultural soils of the Taihu Lake Basin in southern Jiangsu Province was meticulously compiled using publicly available data.The objective was to evaluate the current accumulation status of eight key heavy metals—arsenic(As),cadmium(Cd),chromium(Cr),copper(Cu),mercury(Hg),nickel(Ni),lead(Pb),and zinc(Zn)—and forecast their future trends.The primary routes of heavy metal entry into the soil included atmospheric deposition,livestock manure application,irrigation water,and the use of chemical fertilizers and pesticides,while the main pathways for metals to migrate out of soil were crop removal during harvest and soil leaching processes.The findings revealed that As,Cd,Cu,Cr,and Hg mainly infiltrated the agricultural soils via irrigation water,while Ni entered through atmospheric deposition and the use of chemical fertilizers and irrigation water.Lead and Zn predominantly infiltrated through atmospheric deposition.With regard to the removal of these metals from the soil,As,Cr,Cu,Hg,and Pb were chiefly lost through leaching,whereas Cd and Zn were primarily removed via crop harvesting.Notably,Cd has emerged as the most critical heavy metal requiring attention in the agricultural soil of the Taihu Lake Basin,with the potential to exceed the threshold in the near future.The other heavy metals showed varying levels of accumulation,all remaining well below the established risk thresholds.
input-output inventoryagricultural soilheavy metalrisk warningTaihu Lake Basin
万方数据
维普
