巨柏种群的生态地理分布与群落学特征

对巨柏的地理分布和群落学特征进行研究.结果表明:巨柏的生态地理范围狭小,主要在雅鲁藏布江两岸呈狭带状和斑块状间断分布;目前巨柏已被分割成4个种群,种群间环境异质,水平地带上跨越了湿润、半湿润和半干旱3大生态区.巨柏群落中共调查到维管束植物43科106属130种,巨柏群落的植物区系古老,属的组成较为复杂,区系中特有成分突出,含有大量的中国(西藏)特有种和中国-喜马拉雅分布种.从属的地理分布类型来看,巨柏群落具有明显的温带性质,属于北温带分布类型.巨柏是乔木层的单优势种,灌木层和草本层以全缘草质小型单叶地面芽植物为主.群落植物组成从半湿润区到半干旱区过渡中逐渐稀疏,结构也趋于简单.

Eco-geographic Distribution and Coenology Characteristics of Cupressus gigantea

The eco-geographic distribution and coenologly characteristics of Cupressus gigantea were systematically studied. The results show that the barred and discrete distribution of C. gigantean is narrow only along the riversides of Yalutsangpo; Habitats of four C. gigantea populatiors overed three horizontal distributions zone of the humid, the sub-humid and the semi- arid. The communities of C. gigantea consist of 130 species of diodophyte plants originating from 106 genera and 43 families with significantly ancient and complex characteristics; Many plants in these communities with typical properties Tibet or Himalayas specific. C. gigantea is a uni-predominant species in the arbor layer, microphyll and simple leaf hemicryptophytes are dominated in the shrub and grass layers. The structure of plant communities tends toward simple and the plant composition ture to sparse from the sub-humid to the semi-arid zone .