1. Fifth Institute of Geological of Qinghai Provincial Bureau of Geology and Mineral Resources,Xining 810099, China 2. Earth Science Institute, Jilin University; Changchun 130012, China
In this paper, the Se speciation characteristics of alkaline natural Se-rich soil in eastern Qinghai were studied by collection and analysis of surface soil samples with different Se values. The results show that Se exists in the form of effective state, including water soluble state and ion exchange state, which accounts for 6.38% of the total Se. Carbonate state and iron and manganese oxidation state account for 4.53% of the total Se. The values of both of them are higher than the proportion of corresponding form in some acidic and Se rich soils in China. The unusable state Se, including strong organic state, humic acid binding state and residue state , accounts for 89.09% of the total Se, lower than the level of non-available Se in some acidic and selenium rich soils. The feature of selenium rich soil in Qinghai Province exhibits higher available state, higher potential available state and lower unusable state. In addition to the iron and manganese oxidation state, the values of 6 forms of Se are positively correlated with the total Se. The values of total Se, humic acid binding Se and residue Se are significantly negatively correlated with pH value, thus the total Se and the non-available Se decrease with the increase of soil alkaline environment.
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