【摘要】 根培乌孜山位于拉萨市西北角,属于拉萨河谷典型的高山山地,拥有独特的高山带植物群落。为系统研究根培乌孜山维管束植物区系组成特点,沿其南北坡海拔梯度对维管束植物进行样方调查。结果发现:根培乌孜山共有维管束植物57科,183属,377种;坡向对其植物区系组成有一定影响,阳坡在科、属、种的组成上高于阴坡;科的优势现象明显,阴阳坡优势科保持一致,属的优势现象不明显,种分布分散,单种属丰富,种的优势现象明显,稀有种丰富;全山蕨类植物科、属分布型单一,科以泛热带为主,属以世界分布为主;种子植物分布型丰富,科以世界分布为主,属以温带分布为主,东亚成分次之,热带成分、地中海成分和中亚成分鲜有掺入;植物生活型以草本为主,从乔木、灌木到草本,物种丰富度依次递增,阳坡在群落演替中具有滞后性;阴阳坡在种的组成上差异大,但科、属的亲缘关系很近。更多还原

【Abstract】 Gambo Utse is located in the northwest corner of Lhasa and being a part of the typical alpine moun-tains in the Lhasa valley with an unique alpine plant community.The investigation on vascular plants along thegradient of its north and south slopes was conducted in order to research the characteristics of floristic composi-tion in Gambo Utse mountain systematically.The result showed that the slope aspects had a certain influence onits floristic composition in the study area.Total of 377 vascular plant species were recorded belonging to 183 ge-nus,57 families.The composition of family,genera,and species was more complex at sunny slope than that inthe shady slope,but in terms of proportion,some species,genera and families showed opposite results.The domi-nance of families was obvious but the dominance of genera showed different way.Species distribution patternwas scattered with rich in monotypic genus and dominance of species was obvious with rich in rare species.Thedistribution patterns of family and genus in Pteridophytes were single distribution type and the family was domi-nated by the Pantropic,the genus mainly was Cosmopolitan.The seed plants were rich in distribution type,andthe family mainly was cosmopolitan and genus was mainly dominated by temperate zone type followed by EastAsia elements.The tropical,the Mediterranean and the central Asian elements are rarely incorporated.The plantlife form was dominated by herb and species richness gradually increased from trees,shrubs to herbs.The plantcommunity succession was lag on sunny slope compare to shady slop.Floristic composition showed great differ-ence in species level on the shady and sunny slopes of Gambo Utse Mountain but the relationship in families andgenera were very close between two slopes.更多还原