中国农学通报2026，Vol.42Issue(9)：82-91,10.
粤北典型工矿区农田土壤镉、铅的空间分布特征及其污染评价
Spatial Distribution Characteristics of Cadmium and Lead in Agricultural Soil of Typical Mining Area in Northern Guangdong and Its Pollution Assessment
摘要
Abstract
This study investigated the spatial distribution and risk levels of cadmium(Cd)and lead(Pb)contamination in farmland soils within a typical industrial and mining area of northern Guangdong.An evaluation framework centered on"total content-chemical speciation-bioavailability"was constructed to provide a scientific basis for regional soil heavy metal pollution control and remediation.Taking the specific farmland area around typical industrial and mining industries in northern Guangdong as the research object,field sampling and laboratory analyses were conducted to determine the total concentrations and chemical speciation of Cd and Pb.The contamination degree,ecological risk,and bioavailability were systematically assessed.The results showed that:(1)both the contents and evaluation indices of Cd and Pb exhibit strong spatial variability.The spatial distributions of high-concentration areas differ between the two elements,indicating distinct pollution sources.Cd,in particular,displays significant point-source pollution characteristics.(2)Cd showed a high level according to the potential ecological risk index,whereas Pb was classified as uncontaminated based on both the single-factor index and the potential ecological risk index.However,the risk assessment code(RAC)and reduced partition index(RSP)evaluations for Cd both indicated high contamination levels.For Pb,RAC results suggested mainly low to moderate risk,while its RSP result indicated high contamination.The pollution grades derived from bioavailability-based assessment(using chemical speciation)were higher than those based on total heavy metal content.The soils in the study area were predominantly acidic,which could enhance Cd bioavailability and lead to a high contamination risk.Although Pb was considered safe based on total content evaluation,its potential ecological threat remained significant.Priority should be given to the remediation of Cd,while long-term monitoring of Pb should be strengthened to mitigate the composite pollution risk in the farmland ecosystem.关键词
镉/铅/污染风险评价/生物有效性/空间分布Key words
cadmium/lead/pollution risk assessment/bioavailability/spatial distribution分类
农业科技引用本文复制引用
黄婉怡,高琳,邱甜,林昌华,潘惠柔,郭奕楠,陈蕾蕾..粤北典型工矿区农田土壤镉、铅的空间分布特征及其污染评价[J].中国农学通报,2026,42(9):82-91,10.基金项目
广东省大学生创新创业训练计划项目"韶关地区典型工矿业周边农用地重金属生态风险评估及源解析"(S202410576049) （S202410576049）
韶关学院校级自然科学类科研项目"稻田土壤不同外源物质输入下有机碳特征及其微生物机制"(SZ2025KJ05),"粤北牛肝田土壤障碍因子消减功能性肥料创新与应用"(SZ2022KJ14) （SZ2025KJ05）
韶关学院引进(培养)人才科研项目"典型工矿业周边农用地重金属生态风险评估"(sgxy2024) （培养）
韶关市社会发展科技协同创新体系建设项目"粤北3种林下经济模式对土壤碳库的影响研究"(230330108034341). （230330108034341）
