Forest hydrology function of the Miyun Reservoir watershed:A case study of Beizhuang small watershed
YANG Xin-Bing-；Tu-Xin-Xiao-；Wu-Jun-；Xiao-Xiang-；Chen-Hui-Xin-；Sun-Qiang-Yan
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
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.
杨新兵<sup>1,2</sup>；余新晓<sup>1</sup>；武军<sup>3</sup>；肖洋<sup>1</sup>；陈慧新<sup>1</sup>；孙庆艳<sup>1</sup>. 密云水库集水区森林的水文作用——以北庄小流域为例[J]. 中国水土保持科学, 2007, 5(5): 75-78.
YANG Xin-Bing-；Tu-Xin-Xiao-；Wu-Jun-；Xiao-Xiang-；Chen-Hui-Xin-；Sun-Qiang-Yan. Forest hydrology function of the Miyun Reservoir watershed:A case study of Beizhuang small watershed. SSWCC, 2007, 5(5): 75-78.
2007, Vol. 5 
