Study On Geochemical Characteristics Of Bedrock-soil Trace Elements In Leigong Mountain High Quality Tea Garden

In this paper,Wudong tea Garden,Taoyao tea Garden and Wangfeng tea Garden in Leishan County are selected as the research areas.Through investigation,reconnaissance,sampling and element testing,combined with literature,the geochemical characteristics of bedrock and soil trace elements are discussed.The main research results are as follows:(1)The contents of As,Co,Cr,Cu,Ni,Mn,V and Zn in bedrock are 2,9,68,18,39,182,92 and 42 times of crustal chemical abundance,while Mo and Se are 5.19%and 65.5% of crustal chemical abundance.(2)The correlation coefficients of bedrock and soil As,Co,Cr,Cu,Ni,Mn,V,Zn,Mo and Se are the same,and there is an obvious positive correlation.(3)The content of trace elements in soil is low,in which Se is 4.22 times higher than the standard value of Chinese soil,and the variation coefficients of Mn,V,Zn,Cr,Se,As,Cu,Co and Mo in the soil are all less than 0.50,showing a uniform distribution.(4)Migration of trace elements on the soil profile;Except Mn in Wudong tea garden and Ni in Wangfeng tea garden,other elements first increased and then decreased with the increase of soil depth.(5)Compared with the Soil Environmental Quality-Agricultural Land Soil Pollution Risk Control Standard,the content of As,Cr,Cd,Hg,Pb and Cu did not exceed the standard,and the single-factor pollution index was all less than 1.00.The comprehensive pollution index of nemero is all less than 0.70,and the potential ecological risk coefficient of heavy metals is Hg >,As >,Cd,>,Pb,>,Cu,> Cr in descending order.The main element that affects the potential ecological risk of soil is Hg.The study area belongs to the safe production area of tea.