应用多种方法对稻田土壤重金属污染进行评价

——以江西鹰潭市为例

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关键词：稻田；土壤；重金属；评价；改进型内梅罗污染指数中图分类号：S15 文献标志码：A 文章编号：1671-4652（2025）03-0139-08

ABSTRACT：The soil heavy metal pollution has become increasingly severe，posing significantthreats to food securityand human health.This study investigated paddy fields in Yingtan city，Jiangxi province，and analyzed 53 topsoil samples for cadmium，arsenic，chromium，mercury，lead concentrations and pH levels. Using Jiangxi’s soil background values and agriculturallandrisk screening values as benchmarks，we evaluated polution status through four methods：single-factor polution index，geo-accumulation index，and both conventionaland modified Nemerow polution indices.Theresults showed that： ① Average soil pH was 5.41; ② Mean heavy metal concentrations （mg⋅kg-1 ）were chromium 67.28，arsenic 5.72，cadmium O.36，mercury O.11，and lead 38.86，with cadmium exceeding safety thresholds; ③ The comprehensivepolution evaluationlevelsofheavymetalsinsoil wererankedfromhightolowasfolows：modifiedNemerowindexreferenced to provincial background values > conventional Nemerow index using risk screening values>conventional Nemerow index using background values. The study recommends adopting the modified Nemerow index （integrated with geoaccumulation evaluation） for paddy soil evaluation， providing critical data support for agricultural safety management.

KEY WORDS： paddy fields; soil; heavy metals; evaluation; modified Nemerow pollution index

水稻是我国主要的粮食作物之一，2022年我国水稻种植面积达 2.95×107hm2 ，产量为2.08亿t[1]，均居世界首位。（剩余12792字）