Abstract:
Objective More and more attention has been paid to the utilization and exploitation of Selenium (Se) resources. It is a prerequisite for rational exploitation and utilization to find out the distribution characteristics of Se-rich soils and to know the Se resources of soils systematically.
Method In this study, based on the investigation and evaluation of 1:50,000 land quality geochemistry in Zhongxiang, the hilly area of central Hubei Province. This study used the two-layer grid sampling model in the multi-objective Regional geochemistry survey standard, 2479 topsoil samples, 60 deep soil samples and 148 available elemental soil samples were collected and analyzed to analyze the distribution characteristics of soil Se content and its relationship with soil types, the relationship between Se content and soil depth was used to estimate the amount of soil Se resources.
Result The content of Se in the deep soil was lower than that in the surface soil. The main forms of Se in soil were inert state (73.05%), medium use state (17.69%), exchange state (8.31%) and easy use state (1.40%). The content of Se in surface soil (0 ~ 0.2 m) and deep soil (1.2 ~ 1.8 m) was 29.22 t and 168.44 t, respectively. The two major Se storage soil types are Chao soil and paddy soil.
Conclusion The Se resources in the study area are abundant, in the deep layer is larger than in the surface layer. Se in the area is mainly derived from the accumulation and superposition of the parent material and biochemical activities. The content of soil Se is closely related to human activities, and is positively related to the content of organic matter. The results obtained can provide important theoretical basis for the development and utilization of soil Se resources and the high-quality development of Se-enriched industry in Hubei Province.
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