中国城乡交错带土壤-农作物重金属污染的Meta分析  

Meta-analysis of Heavy Metal Pollution in Soil-crop Systems in China's Urban-Rural Fringe

作　　者：白宗旭 杨雳 王宏蕾 陈涛[1,2] BAI Zong-xu;YANG Li;WANG Hong-lei;CHEN Tao(College of Natural Resources and Environment,Northwest A&F University,Yangling 712100,China;Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China,Ministry of Agriculture and Rural Affairs,Yangling 712100,China)

机构地区：[1]西北农林科技大学资源环境学院,杨凌712100 [2]农业农村部西北植物营养与农业环境重点实验室,杨凌712100

出　　处：《环境科学》2024年第8期4766-4779,共14页Environmental Science

基　　金：中央高校基本科研业务费专项(2452018143)。

摘　　要：受人类活动的影响,城乡交错带农田土壤重金属污染问题十分突出.准确掌握城乡交错带土壤-农作物重金属的污染特征,对保障食品安全与促进社会可持续发展具有重要意义.现有的农田土壤重金属污染研究大多基于小尺度、小范围实地监测,已有的全国尺度研究并不能很好地反映出城乡交错带这一特殊界面的污染特点.通过收集整理已公开发表文献,基于Meta分析探究了中国城乡交错带土壤-农作物系统的重金属污染现状,在此基础上对特定地区主要作物重金属的人类健康风险进行评估.结果显示,我国城乡交错带农田土壤重金属累积显著,其中Cd(I_(geo)=0.89)污染最为突出,其空间分异特征明显;从不同耕地类型来看,水田和水浇地更易发生重金属积累;从不同城市等级来看,中、小城市的土壤重金属累积较为突出;对于城乡交错带农作物而言,Pb和Cd的超标率在水稻(39.64%和28.25%)和小麦(42.72%和27.72%)中最高;作物重金属健康风险评估结果显示,Cd是构成人体健康风险的主要元素,且对儿童和成人构成一定的非致癌风险和不可接受的致癌风险.Owing to the influence of human activities,the issue of heavy metal pollution in farmland soil at the urban-rural fringe has become increasingly prominent.An accurate understanding of the characteristics of soil-crop heavy metal pollution in these areas is of great significance for ensuring food safety and promoting social sustainable development.Most of the existing studies rely on small-scale field monitoring,but research at the national level has not effectively captured the unique pollution dynamics of this urban-rural interface.Based on the published literature,the present study investigated the status of heavy metal pollution in the soil-crop system within China's urban-rural fringe through Meta-analysis.On this basis,the study evaluated the risks to human health associated with heavy metals in major crops in a given region.The results showed that heavy metals were accumulated in farmland soil in the urban-rural fringe of China,especially in Cd(Igeo=0.89)pollution,and its distinct spatial heterogeneity patterns emerged.When considering different types of cultivated land,paddy fields and irrigated land exhibited a higher tendency of heavy metal accumulation.From the varying urbanization levels,the accumulation of heavy metals in soils of small and medium-sized cities was more obvious.For crops in the urban-rural fringe,Cd and Pb had the highest exceedance rate in rice(28.25%and 39.64%)and wheat(27.72%and 42.72%).The health risk assessment results of heavy metals in crops showed that Cd was the main element that posed human health risks,which had some degree of non-carcinogenic risk and unacceptable carcinogenic risk to both children and adults.

关 键 词：城乡交错带 土壤 农作物 重金属 META分析 

分 类 号：X53[环境科学与工程—环境工程]