Soil Geochemistry Characters Of Grassland In Western Of Jilin Province And It's Influence To The Quality Of Fodder Grass

In this paper,we chose chestnut soil,chernozem soil,meadow soil,sandy soil and saline-alkali soil as 5 major soil types to analyze and test.The purpose is to study element geochemistry characteristic of the soil in grassland and to study the enrichment and differentiation status of element on topsoil soil.Then,prove the geochemical composition of soil-forming rock and identified the relationship of effective state of the soil among soil pH,whole elements of soil,effective state of soil and Organic matter content.Last,study the impact of elements of grassland soil to fodder grass.Though this research,we recognized that:1.Enrichment is different on diversity topsoil soil.Cl,C,N and Ca are enriched in chernozem soil;As,Cd,Se,N,Ca and C are enriched in chestnut soil; Cl,C,N and Ca are enriched in sandy soil;Na,Se,C,N,Ca and Cl are enriched meadow soil;N,Mg,Na,Ca and Cl are enriched in saline-alkali soil.Topsoil soil in the study area,with the exception of the district of chestnut soil,the other soil has a different degree of phenomenon of salinization.2.R-type factor analysis showed that,soil-forming rock of various type topsoil soils are close to each other.It is positive that different degree of phenomenon of salinization is existed in topsoil soil.However,the major pollution factors in topsoil soil are different.The major pollution factors in chestnut soil are As-Pb-B-Cr,and the pollution of Cd is growing up as well as the enriching of N,C; the major pollution factors in chemozem soil are Pb-Cr-Zn;in sandy soil,the factors are F-Cr-As-Zn,and element of Hg is growing with the enrichment of C,N,P;it is showed that salinity level is not high in sandy soil for factor Cl is not important in the whole factors in sandy soil;the major pollution factors in meadow soil are Cd-Hg-Pb;the major pollution factors in saline-alkali soil are Cr-As,and harmful elements as such as Cd,Hg,Pb are increasing with the enrichment of C,N.3.The fertility of different topsoil soil is huge different in the study area. Effective N and K as well as organic matter are rich in chestnut soil;meadow soil is after chestnut soil;composite index of chernozem soil is worse than chestnut soil and meadow soil;saline-alkali soil is worse than former;sandy soil is the worst of all.Specially,effective P is low in all types of topsoil soil.4.The effective state of trace elements of all types' topsoil soil in study area is showed that,the means of effective Fe,Mo,Cu,Zn all lower than average levels of Jilin province,otherwise,effective B,Mn are higher than average levels of Jilin province.5.The relevance of effective state and whole elements in topsoil is showed that,effective state of N,B and Mn are better correlation with their whole elements; effective state of Mo and Zn are general to their corresponding elements in topsoil; effective state of p,K,Fe are poor relevance with their corresponding elements in topsoil.The relevance of effective state and pH is showed that,only effective Mn is relevant to pH,effective state of N,B are general to pH.Other elements appeared poor relevance to pH.6.Vertical profiles of soil analysis showed that the eastern part of the study area,soil salinization of the obvious trend,mainly for the central salinization.The eastern,central and western sections are there Se,Pb elements in surface soil enrichment,Zn,F elements in complex changes,reasons to be identified.7.The impact of elements change in fodder grass is including soil and elements of all available content,soil pH,soil organic matter content,soil mineral composition,soil caption exchange capacity,and so on.8.Heavy metals in the grass appeared good correlation with each other.It is showed that heavy metals mutual influence each other obviously when fodder grass is absorbing heavy metals.9.Content of B,Cr,Hg,Na,Cu,Pb,Se,and Zn in fodder grass are significant correlation with the same element in whole elements of topsoil.10.Content of Pb,Na,Ni,K,Zn,P,Ca,Hg and Fe in fodder grass are significant correlation with soil pH;yet Content of As,Cd,Co,Cr,F,Mg,Se,Cu,Mo and Mn are poor correlation with soil pH.Only content of B and Mo in fodder grass are significant correlation with corresponding elements effective status.