Abstract
This study studied that the amounts, species of Se in four kinds of soil (sandy soil, meadow soil, bog soil and peat soil) by a method of successive extraction in order to accumulate scientific data for preventing and curing the selenium response symptom of people and livestock in Ruoergai wetland. The results showed that the content range of Total Se (T-Se) in surface soil layer was 65-260 μg/kg in ten sampling sites and the low Se circumstance existed because of soil Se deficiency. Among several kinds of Se forms, Water soluble Se (W-Se), Exchangeable Se (E-Se) and Organic Se (O-Se) accounted for 1.12-3.08%, 2.91-6.03% and 10.28-45.6% of total Se respectively, unavailable Se including Acid soluble Se (A-Se), Sulfidic Se (S-Se) and Residual Se (R-Se) accounted for more than 60% of total Se. Of the soil O-Se, 57.84% (on average) was associated with the Humic Acid fraction (HA-Se) and 42.16% with the Fulvic Acid fraction (FA-Se), the range of C/Se in soil organic matter was 0.65×106-7.28×106 (on average 2.96×106) in surface soil layer. The soil organic matter was the most important factor affecting the content of soil T-Se and O-Se, the rich soil organic matter was helpful to the accumulation of soil T-Se and O-Se. It was clear that the lower utilization ratio of Se due to the low content of soil T-Se, the higher portion of O-Se and HA-Se were the possible reason for a deficiency of selenium in Kashin-Beck Disease-endemic area, Ruoergai wetland, Sichuan, China.
Highlights
A deficiency of selenium has been found to be associated with a variety of disease conditions in humans (Kashin-Beck Disease) and domestic animals (White-Muscle Diseases) (Yu et al, 2009; Ma and Zhang, 2009)
Changes of Total Se (T-Se) in soil: From Table 3, we can see that a low Se circumstance existed because of soil T-Se deficiency and the area of Se deficiency covered almost all regions except area situated in western part of Black river in Hong Yuan county in Ruoergai plateau
There are 7 sampling sites that the T-Se content of soil is under the standard value of Se deficiency or latent deficiency, only 3 sampling sites that the T-Se content of soil is higher slightly than the standard value of Se latent deficiency according to the standard value of the total Se deficiency in surface soil layer in China (Wang and Wei, 1995)
Summary
A deficiency of selenium has been found to be associated with a variety of disease conditions in humans (Kashin-Beck Disease) and domestic animals (White-Muscle Diseases) (Yu et al, 2009; Ma and Zhang, 2009). Ruoergai wetland lying in the north-eastern part of Qinghai-Tibetan Plateau in China (102°8′-103°36′E, 33°3′-34°19′N, altitude 3400-3900 m), covers an area of 0.5 million hm including moors, carex swamps, lakes and wet prairies. It is the typical plateau wetland in the world and is one of five pastoral areas in China. There is little report on the relationships between KBD and soil Se. This study preliminarily deals with the contents, species of soil selenium in Kashin-Beck Diseaseendemic area, Ruoergai wetland, Sichuan, China in order to provide scientific recommendations for the prevention and cure of KBD
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