小兴安岭东折棱河流域植物区系特征研究

目的]明确小兴安岭蔷薇科植物区系特征。方法]研究小兴安岭东折棱河流域植物区系组成、优势科属组成以及属的地理成分。结果]该区共有高等植物103科284属486种,裸子植物种类少,但在当地森林植被中是优势类型。东折棱河流域科的优势现象比较明显,种类集中趋向于少数科类,寡种科和区域性单种科较丰富;属的优势现象不明显,多集中于寡种属和区域性单种属。苔藓植物属的地理成分复杂,以北半球温带成分占优势,并有不少的世界分布成分;蕨类植物属的地理成分类型较少,以寒温带成分为主,并伴有世界成分和热带亚热带成分;种子植物属的地理成分类型较多,以北温带成分(48.9%)为主,各温带成分比例(81.3%)更大,说明该区系具有相对的独立性。植物生活型中草本植物占绝对优势,物种比例高达77.2%,为苔藓植物和蕨类植物。结论]该研究结果为开发利用小兴安岭蔷薇科植物资源提供了参考。

Plant Flora Characteristic in Dongzheling River Region of Xiaoxing'an Ling

Objective] The aim was to clear the plant flora characteristic in Dongzheling River Region of Xiaoxing'an Ling.Method] We analyzed the plant floristic constitute,dominant families and genus constitute and genus geographic elements in Dongzheling River Region of Xiaoxing'an Ling.Result]There were 486 species belonging to 284 genus and 103 families in the region and the gymnosperm played very important role in local forest vegetation although its limited species numbers.The dominant values of the families were relatively notable,the species were more belonging to the few families,and the families including few species and the families including only species were richness;the dominant values of the genus were not notable,and the families including few species and the families included only species had relatively richness.The genus' s geographic elements of bryophyte plants were more complex,and its dominant geographic element was the North Hemisphere Temperate Zone with some the World elements;the genus' s geographic elements of ferns plants were more few,and its dominant geographic element was the Cold Temperate Zone with the World elements and Torrid Zone and Sub-Torrid Zone elements;the genus' s geographic elements of seed plants were more excessive,its dominant geographic element was the North Temperate Zone,occupying 48.9％,and the percent of the each Temperate Zone was more high,accounting to 81.3％,it showed that the genus' s geographic elements of seed plants were relatively independent.The herbage plants consisted of bryophyte plants and ferns plants were the mainly patterns of pants life that occupied 77.2％.Conclusion] The results provide theoretical basis for the development and utilization of Rosaceae plants in Xiaoxing'an Ling.