地质高背景与矿治活动叠加区土壤玉米系统中重金属迁移行为及健康风险评估

doi:10.19754/j.nyyjs.20260330023

摘要/Abstract

摘要： 本研究以客斯特地区玉米为对象，采集3组土壤-玉米对应样品，分析Pb、Z如、Cd、Ni、C山的含量分布，并综合运用潜在生态风险指数(I)、生物富集与转移因子、体外消化模拟进行系统评估。结果显示，土壤中上述重金属平均浓度均超过风险筛选值。I表明，表层土壤处于高风险水平，其中Pb、如和Cd为主要贡献因子。玉米植株中重金属分布呈现根>叶>茎>籽粒的规律(Z如除外)，各重金属平均生物富集系数(BCF)均< 1,表明玉米整体富集能力有限。Z如在叶部的转移因子(T℉)>1，显示其由根至叶迁移较强。体外模拟消化表明，胃相中Z如与Pb生物可给性较高，Cd极低；肠相中Z如、Pb、C仍保持较高生物可给性，Ni与Cd较低。综上，该区域土壤重金属污染严重，玉米可食部分仍存在潜在健康风险。

中图分类号:

S181

. 地质高背景与矿治活动叠加区土壤玉米系统中重金属迁移行为及健康风险评估[J]. 农业与技术, 2026, 46(3): 113-119.

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