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| Forest hydrology function of the Miyun Reservoir watershed:A case study of Beizhuang small watershed |
| Yang Xinbing<sup>1,2</sup>,Yu Xinxiao<sup>1</sup>,Wu Jun<sup>3</sup>,Xiao Yang<sup>1</sup>,Chen Huixin<sup>1</sup>,Sun Qingyan<sup>1</sup> |
| 1.College of Soil and Water Conservation,Beijing Forestry University,Key Lab.of Soil & Water Conservation and Desertification Combating,Ministry of Education,100083,Beijing;2.Agriculture University of Hebei,071000,Baoding,Hebei;3.Beijing Municipal Bureau of Parks and Afforestation,100029,Beijing:China |
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Abstract This paper presents the effects of forest to the hydrological characteristics with three scales,including the runoff section,the natural slope runoff sites,and the watershed.The results show that:in the experimental watershed,annual runoff coefficient was 43.12% in 2004 and 10.43% in 2005 while sediment yields was zero.Runoff coefficient had significant correlation with rainfall and there was a relation of a conic curve.Comparing the natural slope runoff sites in the forest land and non-forest land,the maximum value of annual runoff coefficient in the forest land was 0.72 in 2003,while one in the non-forest land was 0.97 in 2004.The sediment modulus of natural slope runoff in the forest land significantly dropped.Sediment subduction in the forest land was 18.7% in 2004 and 77.3% in 2005.The order of runoff amount was <i>Castanea mollissina</i>><i>Robinia pseudoacacia</i>><i>Pinus tabulaeformis</i> in the runoff plot of different trees.By sampling inspection on water quality of watershed,the results show that most indexes of water quality achieved the national standards of Ⅰ class,while over-leveled indexes were total N content and total P content.In general,with the increasing the forest coverage in the watershed,the function of flood control,water retention,sediment reduction,and improvement of water quality could be strengthened obviously.
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Received: 26 March 2007
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