【摘要】 分析了祁连山北坡水热状况与植物垂直分布的关系 ,结果表明其气候在水平、垂直方向都有明显的差异 ,气温随海拔升高而递减 ,递减率为 0 .5 8℃ / hm;降水量随海拔升高而递增 ,递增率为 1 8.6 mm/ hm。从而使区内植被分布具有明显的垂直梯度变化规律 ,从下到上依次为荒漠草原植被带、干性灌丛草原植被带、山地森林草原植被带、亚高山灌丛草甸植被带、高山寒漠草甸植被带 ,其中山地森林草原植被带是主要的植被分布带 ,与上下限的灌丛构成祁连山水源涵养林生态系统 ,成为祁连山山地生态系统的主体。更多还原

【Abstract】 Qilian Mountains extends over one thousand kilometers from east to west and its relative height difference is distinctive, and it is influenced by Tibet plateau and Mogolia-Xinjiang desert, which results in clear climate difference in horizontal and vertical directions. The climatic temperature reduces at the rate of 0.58℃/hm with the increase of altitude, and the amount of precipitation increases at the rate of 18.6mm/hm. The climatic changes make the vegetation distribution with evident vertical gradient rule, the vegetation types from the high altitude are: desert-grassland vegetation, dry shrub-grassland vegetation, mountain forest-grassland vegetation, sub-alpine shrub-grassland vegetation, cold-desert alpine meadow, vegetation, among which mountain forest-grassland vegetation is main vegetation type, and it makes up water resources conservation forest ecosystem with shrub in its upper and lower limits and becomes the main body of Qilian Mountains ecosystem.更多还原