生态与农村环境学报2016，Vol.32Issue(6)：940-945,6.DOI:10.11934/j.issn.1673-4831.2016.06.011
青海湖流域主要河口区沉积物中重金属元素生态风险评价
Ecological Risk Assessment of Heavy Metals in Sedimentsat Estuaries of Major Inlets of the Qinghai Lake Basin
摘要
Abstract
In order to investigate the status of heavy metal pollution of Qinghai Lake Basin, samples of sediments were collected from 0-5 cm sediment layers at 11 sampling sites around the inlet estuaries of the lake for analysis of contents of 8 heavy metals ( Zn, Cu, Pb, Hg, Ni, As, Cd and Cr) in an attempt to determine their sources, ecological risks and pol⁃lution statuses. Results show:( 1) The total contents of the 8 heavy metals in the samples varied in the range of 151�61-277�31 mg·kg-1 and averaged 209�65 mg·kg-1 , which was slightly higher than the environmental background values of the surface soil in the Qinghai Lake Basin. In terms of concentration, the 8 elements followed an order of As > Zn > Cr >Ni > Cu > Pb > Cd > Hg, and As, Cr and Zn accounted for 73�63% of the total of the 8. The heavy metals in the sedi⁃ment brought in by human activities came from similar sources, that are agriculture and transportation. In terms of geo⁃ac⁃cumulation coefficient ( Igeo ) the heavy metal displayed an order of As>Hg>Cd>Cu>Cr>Ni>Zn>Pb. Among the 8, As tended to be moderate in pollution level, with an mean Igeo being 1�67. In terms of potential ecological risk, the 8 heavy metals followed an order of Hg>Cd>As>Cu>Ni>Pb>Cr>Zn. Hg, Cd and As were the major contributors of the integrated potential ecological risk index (IR), contributing 40�76%, 25�56% and 25�53% respectively. And (2) In recent years, the problem of heavy metal pollution has emerged as a result of intensified human activities, such as trans⁃portation, discharge of waste water from agriculture, urbanization ( or townization) and development of tourism in the ba⁃sin. The ecosystem of the basin is not so capable of purifying all the heavy metal pollutions down to a low⁃risk level. There⁃fore, it is essential to intensify monitoring and early⁃warning of heavy metal pollution in the medium and small inlets and seasonal inlets of the Qinghai Lake Basin, and work out case⁃specific control and remediation measures, so as to ensure the basin free from heavy metal pollution.关键词
青海湖流域/河口/沉积物/重金属/生态风险评价Key words
Qinghai Lake Basin/estuary/sediment/heavy metal/ecological risk assessment分类
资源环境引用本文复制引用
李少华,王学全,兰岚,高琪,杨占武..青海湖流域主要河口区沉积物中重金属元素生态风险评价[J].生态与农村环境学报,2016,32(6):940-945,6.基金项目
国家自然科学基金重点项目（41130640）；林业公益性行业科研专项 （）
