祁连山(北坡)水源涵养林类型划分与组成结构分析

An Analysis For the Composation Structure and Type classification of Water Conservation Forest in Qilian Mountain (The north faced slope)

分析结果表明 :祁连山水源涵养林主要由干性灌丛林、青海云杉林、祁连圆柏林、湿性灌丛林 4种森林类型组成 ,组成简单、结构单一 ,呈现高寒半干旱气候特点 ;青海云杉林是祁连山水源涵养林的主体 ,相对其它森林类型 ,其组成、层次结构复杂 ;干性灌丛林是祁连山水源涵养林的先锋林型 ,分布在立地条件较差的浅山地带 ;湿性灌丛林是地带性顶极群落类型 ,分布在山地森林草原带上限 ,调节水资源作用巨大。

Water resource conservation forest on Qilian Mountain was constituted by fo ur forest types: they are dry shrub forest, Picea crassifolia, Sabina przewalskii and moist shrub forest.The forest composation and structure are simple ,with distinctive height cold and semiarid climate features. Picea crassifolia are principal part of water resource conservation forest in Qilian Mountains, and composation and structure of layer are complicated than other forest type. Dry shrub forest is vanguard forest type; which distributes at shallow mountain areas with pour soil condition . Moist shrub forest is climal communitie which distributed at the upper of the mountain and connets to meadow.