The Effect of Ground Covering by Litter of Larix principis-rupprechtii to Reducing Velocity of Surface Runoff
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1.
College of Forestry,Agricultural University of Hebei,Baoding 071000,Hebei,China
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2.
Research Institute of Forest Ecology,Environment and Protection,CAF,Beijing 100091,China
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3.
Research Institute of Forest Ecology,Environment and Protection,CAF,Beijing 100091,China
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Received Date:
2006-01-18
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Abstract
For studying the effect of ground covering by Larix principis-rupprechtii litter on reducing the velocity of surface runoff,the experiment was conducted with 0.9 m×0.5 m plots on slopes in Diediegou small watershed of Liupan Mountain in Guyuan,Ningxia.The treatments of 10 litter coverage(0.0,0.5,1.0,3.0,5.0,7.0,10.0,15.0,20.0 and 25.0 t·hm-2) and 5 input flux(10,20,30,40 and 60 mL·s-1) were used.The results showed that compared with the treatment with no litter coverage,the surface runoff velocity was reduced by 57.50%72.27% when the litter coverage varies from 0.0 to 25.0 t·hm-2.The surface runoff velocity had an evident increase with increasing input flux,especially the fastest increase in the case of without litter coverage.On the slope of 14°,the relation among the reduced runoff velocity(△V,cm·s-1),the flow of unit width(q,mL·s-1·cm-1),and litter coverage(G,t·hm-2) was: △V=3.617 7q0.507 5G0.431 5(R2=0.910 2).The Manning resistant coefficient(n) increased with litter coverage.When the litter coverage was less than 10.0 t·hm-2,the value of n evidently increased with the litter coverage;while the litter coverage caries in the range of 10.0 to 25.0 t·hm2,the value of n increased more and more slower.And there was a satisfied binomial relationship between n and litter coverage.
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