【摘要】 以杨属植物为建群种的河谷林是发育在新疆阿尔泰山前的中生值被。本文对其区系组成、地理成份、生活型谱及环境特征进行了分析。河谷林以中生、湿中生成份为主,早中生机物次之,早生及湿生者较少,这些植物可划分成12个种组,其中,9个属中生、湿中生,2个属早生,1个属早中生。河谷林中北温带成份占30.3％,旧大陆温带成份20.2％,世界广布成份19.3％,中亚成份16.5％,地中海—西亚—中亚及温带亚洲成份较少。多年生草本是河谷林的主要生活型,占48.6％,其它依次为落叶阔叶灌木、一年生植物、落叶小叶乔木和水生植物。根据Q聚类分析,9个环境因子分成4个组,其中,3个属显域性,1个属隐域性。更多还原

【Abstract】 In the pediment plain of the Altai District in Xinjiangthere are mesic river valley forests dominated by Populus trees. In this paper their flora, geographical elements, lifeform spectrum and environmental features are reported. In the forests, the principal species are hygro-mesophytes and mesophytes; the second are xero-mesophytes, and xerophytes, while the hydrophytes make up only a small part. All the species can be divided into 12 species-guoups, of which 9 are mesic or hygro-mesic, 2 are xeric and the remaining one is xero-mesic species. 30.3％ of rhe species are Circumboreal elements, followed by Old Continent(20.2％), Cosmopolitan(19.3％), Central Asian(16.4％), Mediterranean, west-& Centre-Asian and Temperate Asian elements. In the forests, perennial herbs and grasses are common (48.6％ of the total species), with deciduous broadleaved shrubs, annuals, deciduous microphyll trees and hydrophytes also being found. Accouding to the Q-cluster analysis, 9 environmental factors are divided into four types, of which 3 are zonal and 1 is azonal.更多还原