Features of soil redistribution and major element migration in a karst hillslope of Southwest China Features of soil redistribution and major element migration in a karst hillslope of Southwest China

最小化 最大化

Vol15 No.9: 1892-1908

Title】Features of soil redistribution and major element migration in a karst hillslope of Southwest China

Author】SONG Chang-shun1,3; JI Hong-bing1,2*; Howard Omar BECKFORD2; CHU Hua-shuo1,3; ZHANG Kun1,3; WANG Shi-jie1

Addresses】1 State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China; 2 School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; 3 Graduate University of the Chinese Academy of Sciences, Beijing 100049, China

Corresponding author】JI Hong-bing

Citation】Song CS, Ji HB, Beckford HO, et al. (2018) Features of soil redistribution and major element migration in a karst hillslope of Southwest China.  Journal of Mountain Science 15(9).  https://doi.org/10.1007/s11629-017-4791-3

DOI】https://doi.org/10.1007/s11629-017-4791-3

Abstract】In this study, we investigated the spatial characteristics of the rate of soil distribution and the mechanism of major element migration in a typical karst hillslope in Guangxi Province, Southwestern China. Soil redistribution was examined using 137Cs technique under different hillslope components. With the combination of geochemical methods, the migration characteristics of major elements in soils of three hillslope components in both the horizontal and vertical directions were determined. Thirty-seven soil samples were collected and analyzed for 137Cs and the major elements were determined. By using the profile distribution model the mean soil redistribution rates were found to be -17.01, 0.40 and -23.30 t ha-1 yr-1 in the summit (BYSD), shoulder (BYSY) and toeslope (BYSJ) components of the studied hillslope, respectively. In comparison to BYSD, the sesquioxides of Fe2O3 and TiO2 tend to be enriched, whereas the alkalis (CaO, MgO, Na2O and K2O) tend to be depleted, both in the shoulder and toeslope components. Due to human and animal activities, the contents of CaO, MgO, K2O and Na2O have somewhat increased within the topsoil. The results indicated that 137Cs activities are significantly correlated with clay particles and organic matter,and are affected by the pedogenic process and vegatation. Overall, it maybe necessary to use techniques such as 137Cs to investigate soil erosion with the combination of geochemical methods.

Keywords137Cs; Karst; Hillslope components; Soil erosion; Major element migration