Response  of mechanical composition of fractured soil to rainfall in shallow Karst slopes in central Guizhou, China.

doi:10.13287/j.1001-9332.201902.005

Abstract

Abstract: Field sampling and indoor pipette method was used to analyze the variation of soil mechanical composition of shallow Karst fissures in response to rainfall under different land uses in Karst rocky desertification region in central Guizhou. Results would supply important scientific basis and direction for further research of soil leakage in the Karst areas. The results showed that silt was the dominant component in soil mechanical composition of shallow Karst fissures, with a content of 57%. In response to rainfall, the contents of silt and clay were increased and that of fine sand was reduced in slope cropland, while the content of fine sand was reduced and that of silt was increased in grassland. The changes of mechanical composition of shallow Karst fissures in forest and shrub land were irregular. Moreover, there was a positive correlation between rainfall and the sand content of shallow Karst fissures. The fissures of land use types had effects on the changes of silt and extremely coarse sand contents with the increase of soil depth, with a decreasing trend of silt.

Key words: Karst slope, soil mechanical composition, leakage of underground soil, rainfall, shallow fissure

YANG Yu-qiong, DAI Quan-hou, YAN You-jin, PENG Xu-dong. Response of mechanical composition of fractured soil to rainfall in shallow Karst slopes in central Guizhou, China.[J]. Chinese Journal of Applied Ecology, 2019, 30(2): 545-552.

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Response of mechanical composition of fractured soil to rainfall in shallow Karst slopes in central Guizhou, China.

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