摘要
湿地是全球三大生态系统之一,而重金属污染已经成为桎梏湿地生态功能的重要环境问题.本文以菜子湖湿地草滩和泥滩两种不同类型0—100 cm垂直剖面土壤为研究对象,通过对比实验方法,分析菜子湖湿地土壤剖面8种重金属元素(As、Co、Cr、Cu、Ni、Pb、V、Zn)的垂向分布特征及迁移规律.结果表明,从整体剖面来看,除Cr、Cu和Pb外,其余重金属元素均不同程度超过安庆市土壤背景值,尤以表层土壤较为严重,说明当地存在重金属累积现象;根据土壤垂直分布来看,草滩和泥滩土壤重金属含量垂向变化较一致,总体表现出随土层深度的增加而逐渐减少的趋势,其中,草滩变化规律较为明显,而泥滩变化规律则稍显复杂;As、Co、Ni和V在草滩和泥滩整个剖面中的迁移系数均大于0,表明存在不同程度的富集,尤以As较为严重;Cu和Cr在两种类型土壤剖面中以富集为主,部分土层深度流失;Pb和Zn在垂直剖面土壤中的迁移特征较相似,均表现为在土壤表层富集,在中底层流失.研究结果可为沿江湿地环境保护提供理论支撑和科学依据.
Wetland is one of the three major ecosystems in the world,and heavy metal pollution has become an important environmental problem restricting wetland ecological function.In this study,two different types of vertical profile soil(0—100 cm)from Caizi Lake wetland grassland and mudflat were collected and the vertical distribution characteristics and migration rules of eight heavy metals(As,Co,Cr,Cu,Ni,Pb,V,Zn)in the profile soil were analyzed by comparative experimental methods.The results showed that:(1)Except for Cr,Cu and Pb,all the other heavy metals in the profile soils exceeded the background values of the soil in Anqing city to varying degrees,especially in the surface soil,indicating that there was heavy metal accumulation in the local area.(2)According to the vertical distribution of soil,the vertical variation of heavy metal content in soil of grass flat and mud flat was consistent,and it gradually decreased with the increase of soil depth.The variation pattern of grass flat was more obvious,while that of mud flat was slightly more complex.(3)The migration coefficients of As,Co,Ni and V in the whole section of grass and mud flats were all greater than 0,indicating that they were enriched in varing degrees,especially in As.Cu and Cr were mainly enriched in the two types of soil profiles,and part of the soil depth was lost.The migration characteristics of Pb and Zn in vertical profile soil were similar,both of which were enriched in the surface layer and lost in the middle and bottom layer.The results can provide theoretical support and scientific basis for the environmental protection of wetland along the Yangtze River.
作者
葛磊
方凤满
周浩
姚有如
谭华荣
王飞
林跃胜
GE Lei;FANG Fengman;ZHOU Hao;YAO Youru;TAN Huarong;WANG Fei;LIN Yuesheng(School of Geography and Tourism,Anhui Normal University,Wuhu,241003,China;Key Laboratory of Earth Surface Processes and Response in the Yangtze-Huaihe River Basin,Wuhu,241003,China)
出处
《环境化学》
CAS
CSCD
北大核心
2024年第3期933-941,共9页
Environmental Chemistry
基金
国家自然科学基金(41977402)资助。
关键词
湿地土壤
重金属
垂直分布
迁移规律
菜子湖
wetland soil
heavy metals
vertical distribution
migration law
Caizi Lake
