生态学报2018，Vol.38Issue(3)：1075-1086,12.DOI:10.5846/stxb201611302449
新疆焉耆盆地辣椒地土壤重金属污染及生态风险预警
Soil heavy metal pollution and ecological risk warning assessment of pepper field in Yanqi Basin, Xinjiang
摘要
Abstract
Heavy metals have long been recognized as pollutants that are potentially harmful to human health.In recent decades,research on heavy metals in soil environments has become a hotspot in environmental research.Under normal conditions,heavy metal concentrations in soils are several orders of magnitude higher than that in the background value of soils.Thus,the concentrations and potential ecological risks of heavy metals in farmland soils are important reference indicators for evaluating farmland soil environmental quality.Human activities are known to result in heavy metal pollution of farmland soils.Recent research in this field in China has focused on the sources,distribution,pollution,and ecological risk of heavy metals in farmland soils in the eastern or central parts.However,there has been limited research on soil contamination of farmland,particularly pepper fields,in the arid regions of northwest China.Therefore,we collected a total of 105 soil samples from pepper field in the main pepper production area (Yanqi Basin) in Xinjiang,China,and determined the content of eight heavy metals (As,Cd,Cr,Cu,Mn,Ni,Pb,and Zn) by standard methods.The heavy metal pollution of pepper field soils was analyzed based on pollution load index (PLI),potential ecological risk index (RI),and ecological risk warning index (IER).The results indicated that the average content of Cd,Cr,Ni,Pb,and Zn exceeded 1.65,1.40,1.32,3.21,and 6.42 times,respectively,that of the background values for irrigation soil in Xinjiang.High levels of Pb,and Zn pollution,low levels of Cd,Cr and Ni pollution,and no As,Mn,or Cu pollution were detected in pepper field soils.The average value of PLI was 1.40,which showed a light pollution level;the average RI for each heavy metal in decreasing order was as follows:Cd,Ni,As,Cu,Pb,Cr,and Zn.The average value of RI of soil was 18.40,which indicated light ecological risk.The average value of IER of soil was-4.78,which indicated a no warning situation.The pollution level,potential ecological risk,and ecological risk warming of Bahrash county were the highest,whereas those of Hejing county were the lowest in Yanqi Basin.As,Cd,Pb,and Zn pollution in pepper field soil were mainly affected by the human activities,and Cr,Cu,Mn,and Ni pollution were mainly affected by the geochemical background of soils.Cd was the main pollutant of farmland soil with strong influence on the PLI,RI,and IER.The pollution risk of Cd should be a major concern during the process of agricultural production in Yanqi Basin.关键词
辣椒地/土壤重金属/污染/生态风险/焉耆盆地Key words
pepper field/soil heavy metal/pollution/ecological risk/Yanqi Basin引用本文复制引用
麦麦提吐尔逊·艾则孜,阿吉古丽·马木提,艾尼瓦尔·买买提..新疆焉耆盆地辣椒地土壤重金属污染及生态风险预警[J].生态学报,2018,38(3):1075-1086,12.基金项目
国家自然科学基金项目(41561073) （41561073）
新疆杰出青年科技人才培养项目(qn2015jq003) （qn2015jq003）
