摘要
[目的]探究垫江县土壤重金属污染特征及生态风险状况,提出合理有效的风险管控建议。[方法]在垫江南部采集2 796件表层土壤(0~20 cm)样品,分析土壤中重金属(As、Cd、Cr、Cu、Hg、Ni、Pb和Zn)和土壤Cd有效态含量及土壤pH,采用单因子污染指数、内梅罗综合污染指数和潜在生态风险指数法开展土壤重金属污染风险评价。[结果]研究区土壤中Cd、Cu、Ni、Pb和Zn累积效应明显。土壤As、Cd和Hg属于高度变异,受人类活动影响较大。土壤重金属的内梅罗综合污染指数以无污染和尚未污染(警戒线)为主,潜在生态风险指数处于轻微风险和中等风险为主,主要风险因子为Cd和Hg,中等风险区主要位于研究区西北部和东南部。土壤Cd的有效性和土壤pH相关性显著,酸性土壤中Cd的有效性更高。[结论]建议加强土壤酸化治理,缓解土壤酸化问题,降低农作物重金属超标的风险。
[Objective]To explore the characteristics of soil heavy metal pollution and ecological risk status in Dianjiang County,and to put forward reasonable and effective risk management and control suggestions.[Method]2796 topsoil(0-20 cm)samples were collected in the southern Dianjiang,and the heavy metals(As,Cd,Cr,Cu,Hg,Ni,Pb and Zn)in the soil,soil Cd available state content and soil pH were analyzed,the single-factor pollution index,Nemerow comprehensive pollution index and potential ecological risk index method were used to carry out soil heavy metal pollution risk assessment.[Result]The accumulation effect of Cd,Cu,Ni,Pb and Zn in the soil of the study area was obvious.As,Cd and Hg in soil were highly variable and were greatly affected by human activities.The Nemerow comprehensive pollution index of heavy metals in soil was mainly non-polluted and not yet polluted(warning line),the potential ecological risk index was mainly at slight risk and moderate risk,the main risk factor was Cd and Hg,and the medium risk areas were mainly located in the northwest and southeast of the study area.The availability of soil Cd was significantly correlated with soil pH,and the availability of Cd was higher in acidic soil.[Conclusion]It is recommended to strengthen soil acidification treatment to alleviate the problem of soil acidification and reduce the risk of excessive heavy metals in crops.
作者
胡小兰
雷冲
王显卿
宋金鞠
胡小俊
徐高海
HU Xiao-lan;LEI Chong;WANG Xian-qing(Chongqing Geology and Mineral Exploration and Development Bureau Nanjiang Hydrogeology Engineering Geology Team,Chongqing 401144)
出处
《安徽农业科学》
CAS
2023年第7期64-67,76,共5页
Journal of Anhui Agricultural Sciences
基金
重庆市2020年度第一批地质矿产勘查类项目(ZC-2020012)。
关键词
土壤重金属
污染特征
生态风险
Soil heavy metals
Pollution characteristic
Ecological risk
