Input-output inventory and risk early warning of heavy metal in farmland soil in Taihu Lake Basin, southern Jiangsu
YANG Li1, DONG Xin-ping1, LIN Jing1, BO Wen-hao1, BAI Zong-xu1, CHEN Tao1,2
1. College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China; 2. Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China
Abstract：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.
杨雳, 董欣平, 林静, 薄文浩, 白宗旭, 陈涛. 苏南太湖流域农田土壤重金属输入输出清单构建及风险预警[J]. 中国环境科学, 2024, 44(9): 5085-5098.
YANG Li, DONG Xin-ping, LIN Jing, BO Wen-hao, BAI Zong-xu, CHEN Tao. Input-output inventory and risk early warning of heavy metal in farmland soil in Taihu Lake Basin, southern Jiangsu. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(9): 5085-5098.
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