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[1]WEN Zhuo-li,ZHOU Fei.Study on Soil Anti-Scourability in Secondary Succession of Typical Plant Communities in Jinyun Mountain[J].Research of Soil and Water Conservation,2008,15(02):13-17.

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Study on Soil Anti-Scourability in Secondary Succession of Typical Plant Communities in Jinyun Mountain

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 15 Number of periods: 2008 02 Page number: 13-17 Column: Public date: 2008-04-20

Title:: Study on Soil Anti-Scourability in Secondary Succession of Typical Plant Communities in Jinyun Mountain

Author(s):: WEN Zhuo-li¹, ZHOU Fei²; 1. College of Resources and Environment, Southwest University, Chongqing 400716, China;2. Chongqing Key Laboratory of the Three Gorges Storehouse District Forest Ecology Protects and Restores, Forestry Research Institute of Chongqing, Chongqing 400036, China

Keywords:: soil anti-scourability; critical shear stress; secondary succession; Jinyun Mountain

CLC:: S157.1

DOI:: -

Abstract:: The chracteritics of hydraulic parameters and erosion and sediment yield variation of slope sheet flows of ten typical plant communities with secondary succession in Jinyun Mountain are studied by means of the scouring experiment with the original soil.The results of this study indicate that(1)under the discharge flows of 1,1.5,2 L/min,there exist distinct differences mostly in the erosion and sediment yields of slope sheet flows of plant communities.(2)With the increase of the discharge flows,the Reynolds number and Froude number of sheet flows increase,but their flow pattern and state remain unchanged.(3) By analyzing the conceptual model of the sediment yield and flow shear stress and combining it with the relative experimental data,the soil critical shear stresses of ten plant communities are determined to evaluate the soil anti-scourabilities of plant communities(the order of the anti-scourabilities from strong to weak is that Imperata cylindrica>Castanopsis fargesii>Gordonia acuminata>Cinnamomun camphora>Machilus pingii>Neosinocalamus affinis>Cunninghamia lanceolata Cinnamomun camphora>Phyllostachys pubescens>Pinus massoniana & Cinnamomun camphora>Pinus massoniana).With the succession of plant communities from the low stage to high stage,the soil anti-scourability tends to increase generally.(4)Through the soil anti-shear strength,the model of the critical shear stress is predicted that t=0.7165k+0.2095,and this model can determine the soil anti-scourability quickly and relatively exactly in the field.

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