Sichuan Wanyuan Typical Characteristic Agricultural Geochemical Characteristics Of Selenium

The selenium is one of the important essential element,is of great significance tohuman body health.In recent years,the degree of knowledge of the trace element selenium and research gradually deepened,the study of selenium in the environment also gradually began to get the attention of scientists from all walks of life.Selenium deficiency and excess selenium intake will affect human body health,it is generally believed that selenium deficiency may be the cause of keshan disease and kashin-beck,more studies have shown that HIV,cardiovascular disease,crohn’s disease,down syndrome and benzene pyruvic acid of disease and other diseases are also associated with selenium deficiency;Our country is a country of selenium deficiency,about 72% of regional soil selenium content is low,about 1 billion people live in low selenium areas,lack of selenium intake has become an urgent problem.On the another hand,eating too much selenium and selenium poisoning can cause,could create a nail and hair loss,nervous system disorders,skin and teeth health deteriorated,and so on and so forth,as a result,the rich selenium in selenium geochemical research has important significance,conducive to the rational development and utilization of selenium resources,and hedge the risks of selenosis bring to people’s health.Sichuan Wangyuan is located in Daba mountain,north and adjacent in Ziyang county selenium-rich region of Shanxi province,on the other side of the east and Hubei Enshi high selenium,and Wanyuan with similar geological environment and climate conditions,the present study showed that o area level of selenium in the soil is higher than the national average,is likely to appear high selenium area,but on the geochemical characteristics of wanyuan selenium research is still in its infancy,the study of selenium in area of crops also only is given priority to with tea.To make wanyuan se-enriched resources more reasonable development and utilization,expand the types of selenium-rich agricultural products,increasing economic value-added agricultural products and agricultural structure adjustment,he wanyuan selenium study of geochemical characteristics of typical characteristic agriculture.Based on Sichuan province geological exploration fund "Sichuan Wanyuan quality characteristic agriculture agricultural geology survey evaluation" project,taking Wanyuan four typical characteristic agriculture as the research object,respectively for rock and soil,the content of selenium in plant distribution characteristics of investigation and study,in identification of rock,soil and plant distribution based on the content of selenium element,discusses the influence factors of selenium content in the environment and migration transformation rule,the results showed that:(1)Selenium content in the rock :Miao Zi area >Da Zhu area >Bai Yang area >Jiu Yuan area,respectively is: 0.853μg/g,0.658μg/g,0.081μg/g and 0.070μg/g,and compared with the crustal abundance(0.08μg/g),Wanyuan selenium content in rock is higher than the earth’s crust averages.(2)The average content of selenium in soil temple Miao Zi area>Da Zhu area>Jiu Yuan area>Bai Yang area,respectively is:2.64μg/g,0.82μg/g,0.34μg/g and 0.29μg/g.Compared with the national background value(0.29μg/g),the greater and temple for selenium content in soil is higher than the background value,Aries,Jiu Yuan area selenium content in the soil and the background value fairly;Selenium content in soil is affected by soil organic matter content,the higher the content of selenium in soil,soil selenium content by soil p H was less affected.(3)Wanyuan selenium in soil on the whole in the residual fraction mainly,the proportion of 40.52%-96.31% followed by bound to strong organic bound,humic acid,water soluble,iron and manganese in combination with bound and carbonate bound and ion exchangeable.Among them,Miaozi area of bioavailable selenium accounted for the largest,followed by thea Jiu Yuan area、Bai Yang area;.(4)In Wanyuan area,the average content of selenium in crops and higher corn and tea,corn,tea,the average selenium content of potatoes to the criteria for selenium rich crops,and the proportion of selenium enriched high,up to 66%,the content of selenium in Miao Zi area and Da Zhu area of various crops is generally higher than Bai Yang area and Jiu Yuan area;(5)The contents of selenium in plant were mainly influenced by plant species,soil selenium content,soil p H,soil organic matter content and so on..The enrichment ability of selenium enriched in different crops was different,and the ability of selenium enriched selenium,and the next was corn.