The Distributing Characteristics,the Latent Ecosystem Endanger And Geology Accumulation Contamination Study Of Agricultural Soil Heavy Metal Elements In Zunyi County

With development of economy,much heavy metal inflows soil,makes the soil structure and function worsen and soil quality descend,and endangers human being health and continual devepment.Therefore,the situations of heavy metal polluter and distributing rules are worthy studying.Through on-site inspection,collecting data and analyzing in laboratory about this text,five types of heavy metal elements(cadmium(Cd),lead(Pb),chrome(Cr),mercury(Hg),arsenic(As)) in agriculture surface layer soil of Zunyi county in guizhou province,are investigated and researched.Carrying on statisticsing analysis about the tested data,the results of the average contents of Cd,Pb,Cr,Hg,As are 0.356 mg/kg,34.15 mg/kg,50.58 mg/kg,0.182 mg/kg,10.92 mg/kg.Carrying on geochemistry radix-line theories study of agriculture surface layer soil heavy metal elements about Zunyi county,the results of geochemistry radix-line contents of Cd,Pb,Cr,Hg,As are 0.204 mg/kg,20.59 mg/kg,42.78 mg/kg,0.090 mg/kg,6.54 mg/kg.Further,the range of heavy metal elements enrichment coefficient from big to small is Hg＞Cd＞As＞Pb＞Cr,Hg enrichment coefficient is up to 102.22%in the soils.Through the variation function analysis,academic model of Cd and Hg is spherical model,academic model of Pb and Cr is Linear with still model,academic model of As is exponential model,Pb,Cr and As hold better structure On the space,Cd and Hg hold stronger space differences.This region five kinds of heavy metal relativity is very strong,all related coefficients are 0.86 above.The latent ecosystem endanger and geology accumulation of soil environment heavy metal elements in Zunyi county are analysed,This region the latent ecosystem risk index of agriculture surface layer soil is less than 150,belonging to slight ecosystem endanger class.the singe factor ecosystem risk index is less than 40,belonging to slight ecosystem endanger class.The range of the singe factor ecosystem risk index isCd＞Hg＞As＞Pb＞Cr.Comparing with the range of the singe factor pollution indictor,higher level Cd and Hg cause pollution of the soil environment and homologous ecosystem endanger.Through the geology accumulation analysis,the geology accumulation Indexs of Cd,Pb,Cr,Hg,As are0.691,0.159,-0.343,0.155,0.431.Carrying on The latent ecosystem endanger and geology accumulation analysis for 889 soil samples of Zunyi county,The results are almost same.The reasons of high soil heavy metals content in zunyi County,mainly are soil female rock heavy metals content influence,exhausting of industry"three discardings",a long period of using fertilizer,automobile tail exhaust gas and mankind's activity influence and so on.