Vertical distribution and migration of heavy metals in different types of soils in Caizi Lake wetland
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.
wetland soilheavy metalsvertical distributionmigration lawCaizi Lake
NETL
NSTL
万方数据
