Speciation of Selenium in Stagnic Anthrosols of Se-Rich Area in Hainan Island

Résumé fourni par la source

Hainan soil pH continues to decrease, and the reduced soil selenium availability of stagnic anthrosols caused by soil acidification influence the selenium absorption in selenium-rich areas. Taking stagnic anthrosols in selenium-rich areas as the object, the soil total selenium concentration and sequential fractionations of surface layer were analyzed, which are Exchangeable (EX), Carbonate-bound (AC), Fe & Mn oxided-bound (OX), Organic-bound (OC) and Residual (RES). The results show that selenium in soil is unevenly distributed among various fractionations, with the RES and OC accounting for the highest proportion. The sum of the selenium content of these two forms is 89.84%. The AC is easily absorbed and utilized by crops. The selenium content in EX and AC are only 1.64% and 2.17%. Soil pH has the most significant impact on the content of EX. Soil acidification will significantly reduce the proportion of this part of selenium, resulting in a decrease in the bioavailability of soil selenium. Especially when the soil pH is higher than 5.5, the proportion of EX in the soil increases with the the pH dropped significantly.

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