摘要
对新疆博斯腾湖湿地边缘带农田土壤中8种重金属元素(As、Cd、Cr、Cu、Mn、Ni、Pb和Zn)地球化学特征进行分析。采用污染负荷指数(PLI)、潜在生态风险指数(RI)和生态风险预警指数(IER)对农田土壤重金属污染与环境风险进行评价。结果表明:(1)湿地边缘带农田土壤Pb和Zn呈现重度污染,As、Cd、Cr和Ni轻度污染,Cu轻微污染,Mn无污染。土壤As、Cd、Cr、Cu、Ni、Pb和Zn平均含量处于轻微风险水平。Cd是污染程度与生态风险等级最高的重金属元素;(2)湿地边缘带农田土壤PLI平均值为1.43,呈现轻度污染,RI平均值为20.62,呈现轻微生态风险状态,IER的平均值为–4.53,呈现无警态势。湿地边缘带PLI、RI与IER空间分布格局基本一致;(3)湿地边缘带农田土壤Pb与Zn来源主要受到人类活动的影响,Cr、Cu、Mn与Ni来源主要受到土壤地球化学作用的控制,As与Cd受自然因素和人为因素共同影响。
The geochemical characteristics of eight heavy metal elements （As, Cd, Cr, Cu, Mn, Ni, Pb and Zn） along the marginal zone of Bosten Lake Wetland were analyzed. The pollution and environmental risks of heavy metals in farmland soils were analyzed based on Pollution Load Index （PLI）, Potential Ecological Risk Index （RI） and Ecological Risk Warning IndeX（IER） Results indicated that： 1） Pb and Zn were at high pollution levels, where as As, Cd, Cr and Ni at light pollution level, Cu at slightly pollution level and Mn at no pollution level. The average contents of As, Cd, Cr, Cu, Ni, Pb and Zn in soils were at slight ecological risk status. Cd was at the highest pollution level and ecological risk; 2） The average value of PLI for heavy metals was 1.43, which showed a light pollution level. The average value of RI was 20.62, which suggested a light ecological risk situation. The average value of IER was -4.53, which indicated a no warning situation. The spatial distribution of PLI, RI and IER were similar. 3） Pb and Zn of farmland soil along the marginal zone of wetland were affected mainly by the human activities, whereas Cr, Cu, Mn and Ni were affected mainly by the geochemical background of soil, and the main sources of As and Cd may be affected by the interaction of human activities and natural factors.
作者
麦麦提吐尔逊.艾则孜
阿吉古丽.马木提
买托合提.阿那依提
艾尼瓦尔.买买提
Mamattursun EZIZ;Ajigul MAMUT;Mattohti ANAYIT;Anwar MOHAMMAD(College of Geographical Science and Tourism, Xinjiang Normal University, Urumqi 830054, China;College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China)
出处
《土壤》
CAS
CSCD
北大核心
2018年第2期369-375,共7页
Soils
基金
国家自然科学基金项目(41561073
41661037)
新疆杰出青年科技人才培养项目(qn2015jq003)资助
关键词
土壤
重金属污染
生态风险
预警
博斯腾湖
Soil
Heavy metal pollution
Ecological risk
Warning
Bosten Lake
