Community Characteristics of Wild Fruit Forests Along Elevation Gradients and the Relationships Between the Wild Fruit Forests and Environments in the Keguqin Mountain Region ofⅠii

In this paper,the quantitative relationship between the wild fruit communities and direct environmental factors is discussed on the basis of detailed data on landscape scale habitats obtained through field vegetation investigation.The results from TWINSPAN and DCCA showed that:1) In the distribution sections of the wild fruit forest in the Keguqin Mountain region,the basic patterns characteristic of the different habitats are due to topographic factors,nutrients and moisture conditions;2) The elevation affected the most basic differentiation of plant communities in the study area,indicating that the elevation condition was the most important factor restricting the distribution of the wild fruit communities in the study area;3) The close relationship between the moisture content in the upper soil layer and the elevation reflected the influence of moisture conditions on both wild fruit and herb-layer communities;4) Nutrient differences not only indicated that the habitat conditions were different in themselves but also showed that the present nutrient conditions of the habitats were seriously affected by human activities.In summary,under complicated mountainous topographic conditions,the habitat conditions for the communities differed very significantly,and the combination of elevation,soil moisture content,total nitrogen,slope aspect,and pH value influenced and controlled the formation of community distribution patterns in the study area.

新疆科古琴山高山流石坡植被的特征

研究对新疆科古琴山高山流石坡植被的植物区系特点、植物群落特征和生物—生态学特性进行了论述。初步查明该地有种子植物 1 7科 2 7属 34种、藓类 5种、地衣 9种。说明该地种子植物种类贫乏 ,特有种少 ,植物区系成分年轻 ,温带特点突出。植物生长稀疏 ,盖度小 ,植物群落结构简单、层次分化不明显、季相单调。植被因坡度、坡向的不同存在明显差异。其植物具有株矮、叶小、根系发达、丛生、莲座状、体被茸毛、生长期短、以营养繁殖为主、多年生、耐寒等特性。