Selenium Of Different Forms In Soil Of Tea Regions In Wanyuan

Selenium is one of the essential microelement of the human body. Selenium has high biological activity, it is a good antioxidant, it may remove organic radical of the body, and anti-tumor, radiation protection and enhancement of the body Immunity and other functions. Selenium deficiency can produce human liver necrosis, myocardial degeneration, pancreas atrophy fibrosis, muscular dystrophy, edema anemia, and reproductive function hemolytic diseases such as depression. But on the other hand, excessive selenium will cause poisoning, including skin bleaching, and finger nail deformation, anemia, neurological symptoms appear and intelligent change. It caused by Keshan disease in China because of selenium deficiency, in Keshan counties of the Heilongjiang and other places; Excessive selenium caused by selenium poisoning that occurred in Enshi city of Hubei and other places.According to the information published by the WHO, more than 40 countries around the world are low in selenium or selenium deficiency, the survey shows that China has 72% of the counties (cities) as the low selenium or selenium deficiency, only Ziyang counties of Shanxi Province, Enshi cities of Hubei Province ,and other individual areas are the rich-Se region. Wanyuan Qinba Mountain Area is located in Sichuan Province, adjacent to Shanxi Province Ziyang counties, and not far from the city of Enshi of Hubei, and because they are in the Qinba Mountain, with similar geographical, climatic conditions and geological background is similar, Therefore, Sichuan Wanyuan also likely to have high-selenium areas.Also, different plants are different in absorbing selenium , and the different parts of the same plant absorb selenium vary . Selenium enrichment of tea is the natural ability of the stronger plants, in tea for 80 percent of the organic Se. So tea is the ideal natural source of selenium. In the vast tea, selenium-rich tea-producing areas and yields are very limited, so, in recent years, developmenting Se-rich tea Se has become hot.Wanyuan abounds in high quality tea, if it had developed, including tea, selenium-rich agricultural products, added a low selenium content of selenium areas, the protection of human health is of great significance. It is convenient totransportat Rich-Se tea, Rich-Se tea application of a wide range of features, is more suited to the content of selenium added. If we can identify elements of Wanyuan Se distribution and health effects, then the Wanyuan enhance the quality of tea, tea value of the increase, the development of brand tea, tea cultivation and the adjustment of agricultural structure is of important guiding significance. Therefore, tea is the breakthrough point in this paper, it is relying on Dazhou City of Sichuan Province and Chengdu University of Technology cooperation projects, "Sichuan Wanyuan Se Geochemistry of the value of research and development," the Wanyuan tea producing areas of rock, soil , Tea in the selenium content analysis. Identification of selenium in rocks, soil, tea in the distribution of identification of rock -the soil - tea in the relocation and transformation of selenium, tea reveal the source of selenium, selenium in the analysis of old and new in the content of tea, tea processing before and after Selenium caused by the difference in the end zone delineated Se anomaly.However, Se in the environment and transformation of the migration, biological and toxicological effects depend not only on its total concentration, its reliance on the specific chemical form. Plants can absorb some of the soil is an effective state of selenium, the total soil are usually not fully reflect the contribution of selenium to plants, so it is very necessary for the form of selenium in the soil for analysis. Through the form of selenium in the soil analysis, to identify soil in the form of distribution, to identify the number of selenium in the soil of the plant to be effective, soil pH and soil-Se soluble state ,We can also change the impact of soil selenium, which can reach and impact of tea plants of selenium in agricultural products. The study concluded as follows:1, Wanyuan selenium in the soil, on average, higher than the national average soil. Selenium in the soil in the biggest 1.74μg / g, the smallest 0.05μg / g, an average of 0.32μg / g. Wanyuan main content of selenium in the soil at 0.2 - 0.4μg / g range. According to collect samples of the experimental results obtained, Wanyuan, 14 percent of the region are low selenium areas, but not selenium deficiency, 68 percent of the region belong to the middle of selenium, 18 percent of the Se-rich region.2, different forms of selenium in the soil the proportion of the average of: water-soluble state to 2.77 percent, 2.84 percent for the exchange of state, acid-soluble state to 11.17 percent, 19.07 percent for organic state, the residue state for 65.02 percent, effective state 26.89 %. Different levels of selenium in the soil of the distribution of different forms of selenium.3, Wanyuan tea in the highest selenium levels to 0.242μg / g, a minimum of 0.0096μg/g, an average of 0.0813μg/g. Selenium contentof tea main in 0.05-0.1μg / g range. Tea-selenium not only and soil-selenium was positively correlated ,with the effective state of the soil selenium have a better relationship.4, From acidic to neutral soil, water-soluble state selenium content with the higher pH value and higher, you can adjust the pH of the soil, such as an effective means of improving the soil content of selenium state.