摘要
为了研究喀斯特地貌区土壤重金属的来源及生态风险,给出农产品安全生产建议,选择在广西中部地区采集表层土壤样品1028个及水稻籽实-根系土壤样品80套,分析了重金属元素(Cd、Cr、Pb、Hg、As、Cu、Zn和Ni)含量、主量成分含量及土壤pH,基于主成分分析和地统计法研究土壤重金属来源,利用潜在生态危害指数法进行生态风险评价。结果表明:研究区土壤重金属污染问题显著,土壤重金属平均含量明显高于广西土壤背景值;土壤重金属主要来源于成土母质,土壤有机质、铁锰氧化物及黏土矿物对土壤重金属含量有着显著影响;造成研究区生态风险偏高的主要影响因子为Cd和Hg;水稻籽实对Cd的吸收主要受到土壤pH和CaO含量的影响,建议施用钙质土壤调理剂,抑制水稻对Cd的吸收,保障农产品安全。
In order to study the source and ecological risk of heavy metals in soil in karst landforms,and give suggestions for safe production of agricultural products,1028 surface soil samples and 80 sets of rice grain-root soil samples were collected in the central part of Guangxi,and heavy metal elements(Cd,Cr,Pb,Hg,As,Cu,Zn and Ni)content,major comopnents content and soil pH were analyzed.Based on principal component analysis,geostatistical method and potential ecological risk index method,heavy metal source and ecological risk assessment were carried out.The results showed that heavy metal pollution in the soil of study area was obviously.The average content of heavy metals in soil was obviously higher than the Guangxi background value.Heavy metals in soil mainly came from soil parent material.Soil organic matter,iron and manganese oxides and clay minerals had a significant impact on the content of heavy metals in the soil.The main influencing factors that caused high ecological risk in the study area were Cd and Hg.The absorption of Cd by rice grain was mainly affected by the soil pH and CaO content.Calcium soil conditioner was recommended to inhibit the absorption of Cd by rice grain and ensure the safety of agricultural products.
作者
陈彪
卢炳科
邱炜
CHEN Biao;LU Bingke;QIU Wei(Guangxi Zhuang Autonomous Region Geological Survey Institute,Nanning Guangxi 530023;Office of Academic Affairs,Nanning College of Technology,Nanning Guangxi 530100)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2022年第5期639-644,共6页
Environmental Pollution & Control
基金
中国地质调查局国家专项“全国土壤状况调查及污染防治”(No.GZTR20070107)
广西土地质量地球化学评价项目(桂国土资函〔2014〕877号)
广西壮族自治区地质矿产勘查开发局“广西关键矿产资源深部勘查人才小高地”项目。
关键词
喀斯特地貌
土壤重金属
来源
生态风险评价
农产品安全
karst landform
heavy metals in soil
source
ecological risk assessment
agricultural products safety
作者简介
第一作者:陈彪,男,1982年生,硕士,高级工程师,主要从事地球化学勘查、土地质量调查研究及环境地球化学调查研究;通讯作者:邱炜。
