关键词: 三峡库区, 土壤元素, 分布特征

Abstract: Based on the analysis of shallow soils, the distribution regularity of Se, I, F in soils in the district of Three Gorges reservoir, and has been discussed in relation to geolgy, soil and geography. The results show that the contents of Se, I are low and F is high in the district of Three Gorges reservoir compared with other provinces or cities. And Se,I,F in soils mainly come from rocks. The soil formed from limestone enrich with Se,I,F elements than other rocks, the soil formed from marlite containing the least Se、I, and the soil formed from sandstones contains the least F. Apart from geological background, F,I are controlled by the topographical feature, the altitude, the vegetation covering types, and the land where soils are distributed. For instance, the lower the altitude or the lesser the gradient where soils are distributed, the lower the Se and F contents in the soils. And the soil covered by conifer forest has high contents of I,Se and the paddy field soil contains the least Se,I,F than other kinds of land.

Key words: the district of Three Gorges reservoir, soil element, distribution characteristics