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[1]ZHANG Zhixin,CHEN Tongde,WANG Haolin,et al.Morphology and Distribution Characteristics of Gravel on Slopes of Different Vegetation Types in Lhasa River Basin[J].Research of Soil and Water Conservation,2023,30(01):256-263.[doi:10.13869/j.cnki.rswc.20220522.002]

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Morphology and Distribution Characteristics of Gravel on Slopes of Different Vegetation Types in Lhasa River Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 01 Page number: 256-263 Column: Public date: 2023-01-10

Title:: Morphology and Distribution Characteristics of Gravel on Slopes of Different Vegetation Types in Lhasa River Basin

Author(s):: ZHANG Zhixin¹, CHEN Tongde¹, WANG Haolin¹, JIAO Juying^1,2, LI Jianjun¹, ZHANG Ziqi¹, CHEN Yulan², LIN Hong¹, XU Qian¹; (1.State key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China)

Keywords:: soil erosion; alpine region; ImageJ software; grain size composition; gravel coverage

CLC:: S157

DOI:: 10.13869/j.cnki.rswc.20220522.002

Abstract:: The distribution characteristics of gravel on slope have a significant impact on soil erosion and hydrological processes. However, the research on the morphology and distribution characteristics of gravel on slope in alpine region is little known. Nine typical slopes(including hillslope and accumulating slope)in Lhasa River Basin in Tibet were taken as examples. The slopes were divided into three types according to the vegetation types of hillslopes-accumulation slopes: grass-grass slope(A), shrub-grass slope(B)and shrub-grass slope(C). The sample sites of each slope were photographed and sampled on site, and the grain size, roundness, aspect ratio and coverage of gravel were obtained by ImageJ software, and the grain size distribution, morphological characteristics and coverage of gravel on slopes of different types were analyzed, morphology and distribution characteristics of gravel on slopes were studied. The results are as follows.(1)The mean grain size of gravel on hillslope A is significantly larger than that on accumulation slope, but there is no significant difference between hillslope B and accumulation slope, and the average particle size of gravel on hillslope C is significantly smaller than that on accumulation slope There are differences in gravel grain size distribution between the same types of slopes.(2)On the whole, there is no significant difference in the roundness and aspect ratio of the gravels on A, B and C.(3)The gravel coverage of hillslope A is larger than that of the accumulation slope, while the gravel coverage of hillslope B slope is similar to that of accumulation slope, while that of hillslope C is smaller than that of accumulation slope. There are differences in gravel coverage between the same types of slopes(4)The mean grain size and coverage of gravel on the hillslope and accumulation slope of A, B and C are mainly affected by the slope gradient, while the grain size distribution and coverage of gravel on the same types of slopes are also different due to the influence of vegetation, climate, lithology and altitude. The research results can provide a theoretical basis for the study of soil erosion and hydrological process in the Qinghai-Tibet Plateau, and provide scientific support for the control of soil and water loss in this region.

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Last Update: 2023-01-10