摘要
通过分析不同水期玉溪大河河道底泥的理化参数及主要重金属含量,评价其潜在生态风险,并探讨了重金属的污染特征及污染物间的相关性。结果表明:玉溪大河河道底泥8种重金属元素As、Hg、Cu、Pb、Cr、Ni、Cd和Zn含量平均值分别为75.2、1.528、84.4、107.1、65.6、28.4、9.00、738 mg·kg^(-1),除Ni外,其余7种元素均明显高于相应的背景值;Cd仅与TP显著正相关,而As、Hg、Pb、Cu、Cr、Zn、Ni 7种金属元素之间存在显著相关性,表明这些元素污染具有同源性;潜在生态风险评价结果显示,单个重金属潜在生态风险顺序为Cd>Hg>As>Pb>Cu>Zn>Ni>Cr;整条河道底泥的潜在生态危害指数值为151~12621,平均值为2362.2,属于极强潜在生态危害,其中河道下段综合潜在生态风险高于上段;As、Cd和Hg等重金属主要来自红塔区工业排放。
The objective of this paper was to investigate the characteristics of heavy metal pollution in sediments of Yuxi River during dry and wet seasons, and to evaluate their potential ecological risk. The average concentrations of As, Hg, Cu, Pb, Cr, Ni, Cd and Zn were 75.2, 1.528, 84.4, 107.1, 65.6, 28.4, 9.00 and 738 mg · kg^-1 respectively, which were all above the soil background values of Yunnan Province except Ni. The concentration of Cd was significantly positively correlated with TP, and the concentrations of As, Hg, Pb, Cu, Cr, Zn and Ni were significantly correlated to each other, indicating that these heavy metals had the same sources. The sequence of potential ecological risk of heavy metals was Cd 〉 Hg 〉 As 〉 Pb 〉 Cu 〉 Zn 〉 Ni 〉 Cr. Average potential ecological risk index of the sediments of the whole river was 2362.2 （ranging 151-12621 ）, suggesting a very high ecological risk. In addition, the ecological risk indexes were higher in the upriver than in the downriver. The main heavy metals in the sediments of Yuxi River were mainly from the industrial discharge from Hongta district of Yuxi.
出处
《生态学杂志》
CAS
CSCD
北大核心
2016年第2期463-469,共7页
Chinese Journal of Ecology
基金
国家自然科学基金项目(31460144)
云南省教育厅重点项目(2014Z148)资助
关键词
玉溪大河
底泥
重金属
潜在生态风险
相关性
Yuxi River
sediment
heavy metals
potential ecological risk
correlation.
