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| Interspecific association and niche of forest vegetation in Rocky Mountain Area of North of China |
| Yang Fengwei1,2,Yu Xinxiao1,Wang Shusen1,Zhang Xiaoming1,Wu Sihong1
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| 1.College of Soil and Water Conservation,Beijing Forestry University,Key Lab.of Soil & Water Conservation and Desertification Combating,Ministry of Education,100083;2.Department of Science and Technology of State Forestry Administ ration,100714:Beijing,China |
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Abstract Based on investigation of forest vegetation in Chaoguanxigou of rocky mountain area of North of China,interspecific association and niche of trees and shrubs in different communities were researched.The results showed that in the aspect of interspecific association,the interspecific positive associations of Qurcus dentata & Tilia mongolica,Qurcus dentata & Rhododendron mucronulatum,Tilia mongolica & Populus davidiana,Tilia mongolica & Fraxinus rhynchophylla,Populus davidiana & Fraxinus rhynchophylla,Ulmus japonica & Syringa pekinensis,Ulmus japonica & Deutzia grandiflora,Ailanthus altissima & Prunus sibirica,Evodia daniellii & Koelreuteria paniculata,Evodia daniellii & Deutzia grandiflora,Rhamnus arguta & Grewia biloba,Rhamnus & Zizyphus jujuba are obvious.Then species trees and shrubs into 4 groups of ecospecies were classified.The tree species of big niche breadth include Tilia mongolica,Qurcus dentate and Ulmus japonica and the shrub species of big niche breadth include Vitex negundo,Celtis bungeana and Zizyphus jujube.Moreover,the value of niche overlap of Prunus sibirica & Syringa pekinensis,Quercus dentate & Fraxinus rhynchophylla,and Tilia mongolica & Ulmus japonica in tree pairs and Vitex negundo & Zizyphus jujuba,Spiraea trilobata & Rhododendron mucronulatum,Vitex negundo & Celtis bungeana,Myriopnois dioica & Rhododendron mucronulatum in shrub pairs are high.
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