【Title】Soil Geochemistry Changes Induced by a Foreign Soil Reconstruction Project in Three Gorges Reservoir Region of China
【Author】LIU Juan1; WEI Chao-Fu1; LUO You-Jin2; DU Jing1
【Addresses】1 College of Resources and Environment, Southwest University, Chongqing 400715, China; 2 Chongqing Academy of Agricultural Sciences, Chongqing 400055, China
【Citation】Liu J, Wei CF, Luo YJ, Du J (2015) Soil geochemistry changes induced by a foreign soil reconstruction project in Three Gorges Reservoir region of China. Journal of Mountain Science 12(6). DOI: 10.1007/s11629-014-3285-9
【Abstract】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: (1) 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.
【Keywords】Anthropogenic activities; Weathering status; Foreign soil reconstruction project; Pedogenic processes; Three Gorges Reservoir region; China