农业资源与环境学报2017，Vol.34Issue(5)：456-465,10.DOI:10.13254/j.jare.2017.0113
沘江流域耕地土壤重金属分布及生态风险评价
Distribution and Ecological Risk Assessment of Heavy Metals in Arable Soils in Bijiang Watershed, China
摘要
Abstract
It has been paid much attention to soil heavy metal pollution in the Bijiang watershed caused by the Lanping lead-zinc mine. We collected 35 arable soil samples along Bijiang, then sampled and tested the contents of As, Cu, Zn, Cd, Pb, Hg. And then with Nemerow Multi-Factor Index and the Potential Ecological Risk Index method, we evaluated the heavy metal pollution risk. The results showed:(1)The accumulation of Pb, Zn, Cd was in a relatively high level, the average was 1146.97, 579.15, 4.85 mg·kg-1 respectively, which was seriously polluted;the average accumulation of As was 26.85 mg·kg-1;but Cu, Hg was slightly polluted. (2)Statistical analysis showed that Lanping area was a main point source pollution of As, Zn, Pb, Cd, while Cu, Hg was pollution caused by different non-point source pollution.(3) Within this basin, the Nemerow index was 17.69, which was serious heavy metal pollution, while the comprehensive potential ecological risk index was 773.38, which was a strong potential ecological risk. The contribution of pollutants was Cd>Pb>Zn>As>Hg>Cu.(4)As a whole, the soil heavy metal pollution of paddy field was higher than of the dry land.关键词
生态风险/重金属/沘江流域/耕地土壤Key words
ecological risk/heavy metal/Bijiang watershed/arable soil分类
资源环境引用本文复制引用
黄维恒,包立,林健,熊荟菁,邓洪,张乃明..沘江流域耕地土壤重金属分布及生态风险评价[J].农业资源与环境学报,2017,34(5):456-465,10.基金项目
云南省科技惠民计划"沘江流域农田土壤重金属污染修复关键技术研究及应用"(2014RA018) （2014RA018）
云南省科技创新人才计划(2015HC018) （2015HC018）
对外科技合作计划-院士专家工作站(2015IC022) （2015IC022）
