Soil geochemistry changes induced by a foreign soil reconstruction project in Three Gorges Reservoir region of China

文献类型： 外文期刊

第一作者： Liu Juan

作者： Liu Juan;Wei Chao-Fu;Du Jing;Luo You-Jin

作者机构：

关键词： Anthropogenic activities;Weathering status;Foriegn soil reconstruction project;Pedogenic Processes;Three Gorges Reservoir region;China

期刊名称：JOURNAL OF MOUNTAIN SCIENCE （ 影响因子：2.3； 五年影响因子：2.6 ）

ISSN： 1672-6316

年卷期： 2015 年 12 卷 6 期

页码：

收录情况： SCI

摘要： Fertile topsoil was added onto the surface of barren slope land in Three Gorges Reservoir region of China in an anthropogenic process known as the foreign soil reconstruction project. The main goal of this paper was to reveal the influence of anthropogenic activities on pedogenic processes and soil classifications. Chemical weathering indices and comparative analysis were applied to discuss changes in geochemical compositions and weathering features of purplish soils (Cambisols) before and after the project. Results showed that: (l) The foreign soil reconstruction project slightly altered the major element composition of topsoil and improved the soil structure. Although the distributions of major elements in the original topsoil, original subsoil, foreign topsoil and newly constructed topsoil were all similar to that in upper continental crust, newly constructed topsoil was the most similar soil. (2) The chemical index of alteration was more sensitive than the weathering index of Parker at indicating chemical weathering status of purplish soil. The chemical weathering status of newly constructed topsoil was higher than that of the original topsoil and lower than that of foreign topsoil. (3) Anthropogenic activities may provide a promising new thought for the anthropogenic soil classification system. The scope and subgroups of Anthrosols should be extended and strengthened. Or there may be a need to combine Anthrosols and Technosols orders to create a new soil order. The results may be used for optimizing soil mellowing engineering activities and enriching the soil classification system.

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