摘要
为了解三门峡黄河湿地沉积物重金属分布特征及生态风险,采用地累积指数评价法和潜在生态风险指数对三门峡黄河湿地不同类型湿地重金属生态风险进行评价。结果表明:杨家湾湿地表层土壤(0~10 cm)重金属含量显著高于天鹅湖湿地,杨家湾湿地中汞(Hg)、铬(Cr)、砷(As)、锰(Mn)、铁(Fe)含量高于天鹅湖湿地;除Cr外,光滩其它重金属含量均低于植被覆盖样点,植被有助于重金属在沉积物中累积,不同植被对重金属的累积程度不同。三门峡黄河湿地中Hg、镉(Cd)在时间尺度上变化较大,其地累积指数(I_(geo))最大值分别为2.37、2.10,属于中度风险,其它重金属无污染。三门峡黄河湿地重金属潜在生态风险指数(RI)为91.6~422.0,平均值为212.3,属于中等风险,E_(r)值显示Hg和Cd为高风险,光滩RI值(91.6)显著低于芦苇和香蒲覆盖样地(155.58,221.74)。三门峡黄河湿地重金属生态风险为中度污染,主要风险源为Hg和Cd。
Geo-accumulation index and potential ecological risk index were used to estimate the degree of heavy metal contamination in the different types of wetlands in Sanmenxia Yellow River wetland.The results showed that the heavy metal contents of surface soil(0 to 10 cm) in Yangjiawan wetland is significantly higher than that in Swan Lake wetland.The contents of Hg,Cr,As,Mn and Fe inYangjiawan wetland were higher than those in swan Lake wetland.Except for Cr,the contents of other heavy metals at sites without vegetation cover were lower than those at vegetation covered sites,indicating that vegetation contributed to the accumulation of heavy metals in sediments.Hg and Cd vary greatly on the time scale,and the maximum values of Geo-accumulation index(igeo) were 2.37 and 2.10 respectively,indicating a moderate ecological risk.The potential ecological risk index(Ri) of heavy metals was between 91.6 and 422.0,with an average value of 212.3,indicating a medium ecological risk,and the E_(r) value showed that Hg and Cd were of high risk.The Ri value of sites without vegetation cover(91.6) was significantly lower than that of the vegetation covered sites(155.58,221.74).The ecological risk of heavy metals in sanmenxia Yellow River wetland was moderate,and the main risk sources were Hg and Cd.
作者
官庆松
杨黎君
高玮
张振江
李庆斌
赵明杰
许慧豪
GUAN Qing-song;YANG Li-jun;GAO Wei;ZHANG Zhen-jiang;LI Qing-bin;ZHAO Ming-jie;XU Hui-hao(State Key Laboratory of water and sediment science and water conservancy and Hydropower Engineering,Beijing 100000,China;College of Application of Engineering,Henan University of Science and Technology,Sanmenxia 472000,Henan,China;Sanmenxia Yellow River wetland environmental process and ecological restoration engineering technology research center,Sanmenxia 472000,Henan,China;Sanmenxia ecological environment monitoring center,Sanmenxia 472000,Henan,China)
出处
《湿地科学与管理》
2023年第1期55-59,共5页
Wetland Science & Management
基金
清华大学水沙科学与水利水电工程国家重点实验室开放研究基金(sklhse-2021-C-05)。
关键词
黄河湿地
重金属
风险评价
Yellow River wetland
Heavy metal
Risk evaluation
