华北土石山区天然植被种间联结和生态位研究

 在华北土石山区潮关西沟流域天然森林植被调查的基础上,对森林植被群落种间联结和生态位进行研究。结果表明:种间正联结关系非常显著的有柞栎和蒙椴、柞栎和迎红杜鹃、蒙椴和山杨、蒙椴和白蜡、山杨和白蜡、春榆和北京丁香、春榆和大花溲疏、臭椿和山杏、臭檀和栾树、臭檀和大花溲疏、锐齿鼠李和孩儿拳头、小叶鼠李和酸枣。另外,依据种间联结关系,划分了4个生态种组。分析了主要乔灌木的生态位宽度,乔木树种蒙椴、柞栎、春榆和灌木树种荆条、小叶朴和酸枣的生态位宽度均较大。比较了不同种对的生态位重叠指数,乔木不同种对中,山杏和北京丁香、柞栎和白蜡、蒙椴和春榆具有较大的生态位重叠,灌木不同种对组合中,荆条和酸枣、绣线菊和迎红杜鹃、荆条和小叶朴、蚂蚱腿子和迎红杜鹃的生态位重叠较大。

Interspecific association and niche of forest vegetation in Rocky Mountain Area of North of China

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.