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| DOI： |
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| Soil Property and Morphology of Soil Cracks in Sediment Trap of Gully Badlands in Dry-hot Valley |
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XIAO Liang, XIONG Donghong, ZHANG Baojun, ZHANG Su, YANG Dan, WU Han, SHI Liangtao, XU Li
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Key Laboratory of Mountain Hazards and Surface Processes, Chinese Academy of Sciences, Chengdu 610041, China; Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China; University of Chinese Academy of Sciences, Beijing 100049, China; Institute of Tropical Eco-agricultural Sciences, Yunnan Academy of Agricultural Sciences, Yuanmou 651300, China; Soil and water conservation ecological environment contribution substations in Liangshan, Xichang 615000, China
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| Abstract: |
| Based on investigation, laboratory analysisand digital image processing, we quantitatively analyzed soil properties and morphology of soil cracksin PJ, PD and PM. We also discussed the effects of soil properties on development of fracture morphology. The results showed that ①bulk density and clay content was PD＞PJ＞PM; soil porosity was PM＞PD＞PJ; organic matter was PM＞PJ＞PD. Extreme ratio of soil properties at different locations: the greatest was content of clay (1.94), followed by the organic matter (0.65), soil porosity（0.27）and bulk density (0.09). The difference between soil properties in PJ and PD was due to their different source materials and depositions. The PMsoil was mainly affected by vegetation distribution and over-flow-condition.②Lc and K was PD＜PJ＜PM, Rc, APc and AWMFRAC was PD＞PJ＞PM. ③Pearson correlation analysis showed that the length density and bulk density (p=-0.782), clay content (p=-0.626) are negatively correlated. The connectivity index was negatively correlated with clay content (p=-0.618). It was showed that the bulk density and clay content played an important role in crack growth. The results could provide a basis for improving degraded soil and vegetation restoration of the gully badlands in Dry-hot valley region. |
| Key words: sediment trap area; soil properties; soil crack’s morphological feature; gully badlands; dry-hot valley |
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