农学学报2025，Vol.15Issue(3)：24-35,12.
有效态重金属在土壤与作物系统中迁移运转及安全阈值研究
Research on Migration and Safety Threshold of Available Heavy Metals in Soil and Crop Systems
摘要
Abstract
Determining the safety threshold of heavy metals in soil is an important measure to ensure the quality and safety of agricultural products in China.By studying the accumulation and transportation characteristics of five heavy metals(Cr,Cd,Pb,As,and Hg)in different organs of corn and wheat in the cities of Jinchang,Zhangye and Baiyin in Gansu Province and establishing the relationship between the effective content of Cr,Cd,Pb,As,and Hg in soil and crop grains,this study identified the safety threshold of effective heavy metals in soil for corn and wheat systems.This study employed the method and principles of species sensitivity distribution(SSD)and derived the safety threshold of effective heavy metals in soil for corn and wheat planting systems based on the cumulative probability distribution curve of the Logistic function distribution model.The results showed that the accumulation pattern of Cr,Cd,Pb,As and Hg in wheat plants was consistent,namely,roots＞stems＞grains,and similarly,the accumulation pattern of Cr,Pb,As and Hg in corn plants was roots＞stems＞grains,while the accumulation pattern of Cd was stems＞roots＞grains.Utilizing the Logistic function distribution model to fit the cumulative probability distribution curve based on the effective content of heavy metals,the safety thresholds of effective Cr,Cd,Pb,As and Hg in wheat soil were determined to be 0.019,0.771,35.294,2.777 and 0.133 mg/kg,respectively.Meanwhile,the safety thresholds of effective Cr,Cd,Pb,As and Hg in corn soil were determined to be 0.296,7.90,52.363,12.462 and 0.119 mg/kg,respectively.The results of this study indicate that estimating the safe threshold of effective heavy metal content based on the cumulative probability distribution curve method was scientific,providing a scientific basis and support for the safe planting and risk control of wheat and corn.关键词
小麦/玉米/有效态重金属/安全阈值/土壤重金属/物种敏感性分布法/Logistic函数/累积概率分布曲线/农产品质量安全Key words
wheat/corn/available heavy metal/safety threshold/soil heavy metals/species sensitivity distribution method/Logistic function/cumulative probability distribution curve/safety of agricultural product quality分类
资源环境引用本文复制引用
路港滨,俄胜哲,袁金华,张鹏,刘雅娜,赵晓龙..有效态重金属在土壤与作物系统中迁移运转及安全阈值研究[J].农学学报,2025,15(3):24-35,12.基金项目
甘肃省农业科学院重点研发项目"甘肃主要土类理想土壤肥力定向培育关键技术研究"(2022GAAS39) （2022GAAS39）
国家重点研发计划项目"河西走廊小麦玉米安全生产技术标准研究"(2017YFD0801103). （2017YFD0801103）
