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[1]Meng Wenyang,Rao Liangyi.Spatial Variability of Soil Erodibility Factor K of the Typical Small Watershed in the Soil Covered Area of Pisha Sandstone Region[J].Research of Soil and Water Conservation,2024,31(03):10-19.[doi:10.13869/j.cnki.rswc.2024.03.017]

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Spatial Variability of Soil Erodibility Factor K of the Typical Small Watershed in the Soil Covered Area of Pisha Sandstone Region

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 03 Page number: 10-19 Column: Public date: 2024-04-30

Title:: Spatial Variability of Soil Erodibility Factor K of the Typical Small Watershed in the Soil Covered Area of Pisha Sandstone Region

Author(s):: Meng Wenyang^1,2, Rao Liangyi^1,2; (1.School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China; 2.Key Laboratory of State Forestry and Grassland Administration on Soil and Water Conservation, Beijing 100083, China)

Keywords:: K value of soil erodibility; EPIC model; spatial variability; soil cover area of Pisha sandstone region; small watershed

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2024.03.017

Abstract:: [Objective] The spatial variability of soil erodibility of the typical small watershed in the soil covered area of Pisha sandstone region were explored, and to provide scientific basis for further exploring the mechanism of soil erosion and effectively preventing soil erosion in the soil covered area of Pisha sandstone region. [Methods] Erlaohugou small watershed in the soil covered area of Pisha sandstone region was taking as the study area. 144 soil soil samples from 0—10 cm and 10—20 cm soil layers were collected. The EPIC model was used to calculate the soil erodibility K value, and the methods of GIS and geostatistics was used to analyze the spatial variability of soil erodibility K value. [Results](1)The variation coefficients of sand, silt, clay and soil organic carbon were moderate variability in small watershed. Except for the clay and soil organic carbon possessed by moderate spatial correlation, other soil properties had weak spatial correlation.(2)The range of soil erodibility K value was 0.018 7～0.047 6 t·hm²·h/(hm²·MJ·mm), and the variation coefficients of K value in 0—10 cm and 10—20 cm soil layers were 15.5% and 20.3%, respectively, which belonged to moderate variability. The K value in 0—10 cm soil layer affected by random factor was weak spatial correlation, yet the K value in 10—20 cm soil layer was moderate spatial correlation and influenced by random and structural factors.(3)The result of three Kriging methods showed the spatial variability of soil erodibility K value was significantly affected by elevation and slope, and spatial distribution exhibited a trend that the high K value was located in the west and southeast, and the low stand in central and east-central area. Compared with other Kriging methods, the Ordinary Kriging was more suitable for the Pisha sandstone region as a result of the better reflection of spatial variability from whole and partial.(4)In vertical spatial distribution, the soil erodibility K value belonging to different soil layers had similar distribution trend, but the spatial variability of K value in 10—20 cm soil layer was more obvious than that in 0—10 cm soil layer. [Conclusion] The elevation and slope affect the spatial variability of soil erodibility K value significantly, and the priority area for prevention and control is slope surface and top of slope in the future.

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Last Update: 2024-04-30