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[1]YANG Ling,HE Xiubin,BAO Yuhai,et al.Soil Erodibility of Cynodon dactylon Grassland at Different Altitudes in the Reservoir Riparian Zone[J].Research of Soil and Water Conservation,2021,28(05):1-6.

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Soil Erodibility of Cynodon dactylon Grassland at Different Altitudes in the Reservoir Riparian Zone

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 05 Page number: 1-6 Column: Public date: 2021-08-20

Title:: Soil Erodibility of Cynodon dactylon Grassland at Different Altitudes in the Reservoir Riparian Zone

Author(s):: YANG Ling^1,2,HE Xiubin¹,BAO Yuhai¹,ZHENG Xiaolan^1,2,SONG Jiao^1,3,LI Jinlin^1,2; (1.Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China; 2.University of Chinese Academy of Sciences,Beijing 100049,China; 3.School of Geography and Tourism Science,Chongqing Normal University,Chongqing 401331,China)

Keywords:: soil erodibility K value; EPIC model; grassland; spatial variation; reservoir riparian zone

CLC:: S151.9; S157

DOI:: -

Abstract:: The K value of soil erodibility is of great significance to the quantitative study of soil erosion. At present,research on soil erodibility in the reservoir riparian zone is relatively scarce. In this study,0—20 cm topsoils of Cynodon dactylon grassland at different altitudes in the typical riparian zone of the Three Gorges Reservoir were collected,and the soil in Cynodon dactylon grassland at 180 m altitude was used as the control. The soil erodibility K values of the sample plots at different altitudes were calculated by EPIC model,and the spatial variation of K values was analyzed. Meanwhile,the effects of soil particle composition,waterstable aggregate content and organic matter on the K values were discussed. The results show that:(1)the content of clay,volumetric fractal dimension,water-stable aggregates(>0.25 mm)and organic matter in the surface layer(0—20 cm)are lower than those in the control(180 m),and increase with the elevation; the soil organic matter content in the 0—10 cm layer is higher than that in the 10—20 cm layer,while the clay content and water-stable aggregates(>0.25 mm)in the 0—10 cm layer are significantly lower than those in the 10—20 cm layer;(2)K value in the 10—20 cm layer ranges from 0.049 6 to 0.061 2 with an average value of 0.054 1,which is 7.33% higher than that of non-flooded control,belonging to high erodibility soil; the results also show that the K values decrease with the increase of altitude,and K value of 0—10 cm soil layer is lower than that of 10—20 cm layer,but there is no significant difference between them(p>0.05);(3)K value is significantly negatively correlated with the contents of soil clay,water-stable aggregates(>0.25 mm)and organic matter,negatively correlated with the volumetric fractal dimension of soil particles,and positively correlated with the contents of silt and sand. In conclusion,the vegetation restoration in the riparian zone can prevent the erosion of wave and rainfall runoff on the clay content of surface soil,improve the soil structure and increase the content of organic matter,so as to effectively reduce the soil erodibility.

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Last Update: 2021-08-20