Distribution Characteristics of Soil Elements and Its Pedogenetics in the Three Gorges Reservoir District

Abstract

Abstract: Taking Wanzhou as example of the Three Gorges Reservoir District, the paper studies the contents of weathering elements, such as Si, Al, Fe, K, Mg, Ca, and Na, and their distribution characteristics in parent rock and soil. The results show that the ranking of the average contents of elements is that Si>Al>Fe>K>Mg>Ca>Na. The contents of Fe、Ca、Mg、Na、K are higher than the back-ground values of soil elements of China and the world, and Al is intervenient, and Si is lower. It can be showed that the contents of Ca、Mg、K are the highest in the soil developed by limestone and are the lowest by sandstone.Among the soil developed by clastic rock, the contents of weathering elements developed by mudstone are higher than siltstone and sandstone. And it developed by siltstone is in the middle. The ranking of the leaching of parent rock is that: Ca>Mg>Al>Si>K>Fe>Na. Na is one of the lowest of them as the contents of Na in soil could be supplied by Na in parent materials. The degree of soil weathering in semi-tropical region could be not illustrated by CIA, CIW, A, B, ba, etc., calculated from the contents of weathering elements in soils. The silica-alumina molecular ratio and silica-sesquioxide molecular ratio of the fraction in soils on soil weathering are only used in at early developed soil, or at early weathering parent materials.

CLC Number:

S155

Li Yu, Wei Chaofu. Distribution Characteristics of Soil Elements and Its Pedogenetics in the Three Gorges Reservoir District[J]. Chinese Agricultural Science Bulletin, 2007, 23(12): 356-356.

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