Abstract: The migration, transformation and ecological effects of selenium in soil are not only related tothe total content of selenium in soil, but also to the existing speciation of selenium in soil. In this paper,the relationship between the form of selenium element and its total content, organic matter content and pHvalue in surface soil of Lichuan City, Hubei Province was studied. The results show that the content ofselenium in the non-selenium rich soil in the study area was higher than that in the selenium rich soil ex-cept for the average content of humic acid bound and strong organic bou nd. The content of organic matterin soil is positively correlated with the content of selenium in water - soluble state, carbonate combinedstate and strong organic combined state, the correlation coefficient is more than 0. 3, and slightly posi-tively correlated with the content of ion-exchange state, humic acid combined state, iron manganese com-bined state and residue state. Soil pH has a significant effect on ion exchange and exchangeable state,and in alkaline soil, the available state content of selenium is higher.

Key words: selenium, controlled factor, speciation, surface soil, Lichuan City