YU Chenhui, TIAN Xue, LIU Xinming, et al. Evaluation of Soil Anti-Erodibility of Unstable Slope in Debris Flow Basin[J]. 2022, 36(4): 13-21.
DOI:
YU Chenhui, TIAN Xue, LIU Xinming, et al. Evaluation of Soil Anti-Erodibility of Unstable Slope in Debris Flow Basin[J]. 2022, 36(4): 13-21. DOI: 10.13870/j.cnki.stbcxb.2022.04.003.
Evaluation of Soil Anti-Erodibility of Unstable Slope in Debris Flow Basin
This paper aims to investigate the effect of different sections of unstable slope on soil anti-erodibility and deepen the understanding of the action mechanism of landslide on slope soil structure. Totally five sample plots (including Dadi shady slope
Xiaojianfeng sunny slope
Duozhao gully sunny slope
Chajing gully sunny slope and Daaozi gully shady slope) in three climate regions (including temperate humid mountain ridge region
subtropical and warm temperate sub-humid region
subtropical dry-hot valley region) were selected as a research area in the Jiangjia gully watershed
Dongchuan district
Kunming
Yunnan Province. We analyzed the physical and chemical properties of soil samples and used principal component analysis (PCA) to study the soil erosion resistance of unstable slopes in the study plots. The results showed that:(1) The soil water-holding capacity
porosity structure
organicmatter content
hydrolyzed nitrogen
available potassium
the proportion of particle size ≥ 0.25 mm
mean weight diameter of soil aggregate in the stable area were significantly larger than those in the accumulation area. The above indicators showed the trend of stable area> unstable area>accumulation area
while the soil bulk density
available phosphorus
total phosphorus
and the proportion of particle size<0.25 mm in the stable area were significantly smaller than those in the accumulation area. (2) The comprehensive index of soil anti-erodibility (F) of the 5 sample plots ranged as:stable area (2.401)>unstable area (0.017)>accumulation area (-2.417)
and the difference among 3 slope sections was significant (p<0.05). The indexes of soil anti-scourability followed the rule as stable area (45.873 L/(s·g))>unstable area (33.245 L/(s·g))>accumulation area (15.723 L/(s·g)). There were significant differences between the stable zone and theaccumulation zone (p<0.05). There was a significantly positive relationship between the comprehensive index of soil anti-erodibility and the indexes of soil anti-scourability. (3) The soil water-holding capacity
porosity
organic matter content
nitrogen and potassium content
the proportion of particle size ≥ 0.25 mm and mean weight diameter in the study area were significantly positively correlated with the comprehensive scores of soil anti-erodibility
while the soil bulk density
available phosphorus content
and particle size <0.25mm were significantly negatively correlated with the comprehensive scores of soil anti-erodibility. This study clarifies the corresponding mechanism of soil erosion resistance in debris flow basin on landslide induced unstable slope
promotes the understanding of the impact of disasters on soil structure
and has reference value for comprehensive measures to improve soil erosion resistance on unstable slope.
De Baets S, Poesen J, Knapen A, et al. Impact of root architecture on the erosion-reducing potential of roots during concentrated flow[J].Earth Surface Processes and Landforms, 2007, 32(9):1323-1345.
Felipe G, Robert L S, Eugene K. Effects of slash-and-burn management on soil aggregate organic C and N in a tropical deciduous forest[J].Geoderma, 1999, 88(1/2):1-12.
Sonal S, Jamuna S S. Water-stable aggregates and associated organic matter in forest, savanna, and cropland soils of a seasonally dry tropical region, India[J].Biology and Fertility of Soils, 1996, 22(1/2):76-82.
In Situ Experimental Study on the Characteristics of Soil Pore and Strength in Coastal Reclamation Areas
Soil Quality Assessment of Five Typical Forest Stands in the Dianchi Lake Basin based on MDS
Effects of Biological Soil Crusts Development on Soil Anti-erodibility on Karst Slope
Spatial and Temporal Changes and Driving Mechanism of Cultivated Land Conversion in Central Yunnan Urban Agglomeration from 1990 to 2020
Soil Quality Evaluation and Obstacle Factors of Erosion Slop in Karst Trough Valley Area
Related Author
SUN Xiaoqin
PAN Yongchun
TANG Shengqiang
SHE Dongli
JIANG Ziyu
WANG Hongde
JIN Zhehao
WANG Keqin
Related Institution
College of Soil and Water Conservation, Hohai University
College of Agricultural Science and Engineering, Hohai University
National Plateau Wetland Research Center
School of Soil and Water Conservation, Southwest Forestry University
Key Laboratory for Plateau Wetland Conservation, Restoration, and Ecosystem Services of Yunnan Province, School of Ecology and Environment (Wetland College), Southwest Forestry University