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- W2364263185 abstract "According to the analysis results of topsoil, the distribution characteristics of main elements and trace elements, including Ca, P, and B, etc. in soils from different topography in the area of the Three Gorge Reservoir have been discussed. The results show that two geo-chemical districts can be divided in the Chongqing area of Three Gorge Reservoir. One is the river valley plain and erode denudation topography district, another is fold uplift and karst topography district. The element contents in soils from two districts have different characteristics. Except the main element K_2O, SiO_2, Ba, MgO, P and Zr and trace element Sr and La, the contents of other elements in the first district is much lesser than those of the second district. These characteristics are determined by the diversity of the geological background. The element distribution of the soils, forming from same kinds of parent rocks ,is influenced by the types of topography. From the valley plains to erosion plateaus and hills, the parent rocks are the mudstones and sandstones mostly, so the contents of B and Bi etc are almost alike in different topography section. When the elevation rises, the contents of Ca, Pb, Zn and La etc decrease, and Se, I and Nb increase. Except SiO_2, Zr, Nb, Se, I, Br, W, and As, the main elements and trace elements in mid-mountain of erode and denudation type are lower than that of other topographies. The soil and water loss is responsible for lower contents of elements in this area. When some elements, such as CaO, Cu, Y, and Cl, transfer from high topography to lower topography they behave the jump change characteristics. The clustering of elements in soils according to the different topography, show the various features. The elements, such as Fe_2O_3, Mn, Cu, and Zn group or N and org.C group cluster in the same kind in different topography. But some element, such as Cl, cluster with MgO and CaO or Na_2O in terms of the topographical condition, showing the assembled characteristics of elements vary in various topography." @default.
- W2364263185 created "2016-06-24" @default.
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- W2364263185 date "2005-01-01" @default.
- W2364263185 modified "2023-09-25" @default.
- W2364263185 title "The Element Distribution Characteristics of Soils in Different Topography in the Three Gorge Reservoir" @default.
- W2364263185 hasPublicationYear "2005" @default.
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