摘要
定量比较天山北坡中段乌鲁木齐地区各草地植被垂直带中具代表性的16个主要草地类型的植物多样性指数、物种丰富度指数和均匀度指数。从各草地类型多样性指数大小来看,山地草甸>草甸草原>典型草原>荒漠草原>亚高山草甸>高寒草甸>荒漠。其中分布于山地草甸的鸭茅+草原老鹳草+杂类草的草地类型和草原老鹳草+杂类草+禾草的草地类型的物种多样性指数最大,而分布于荒漠带土质生境的散枝猪毛菜+角果藜的草地类型和小蓬草地类型的物种多样性指数最小。其结果反映了生境异质性沿着水、热生态梯度变化的规律;从草地物种多样性的角度,揭示了不同草地类型在组成、结构、功能和动态的差异;通过指数间相关关系的分析,探讨草地类型多样性与草地生产力的相互影响,可为该地区的生物多样性资源保护提供科学依据。
In this paper, the diversity indices, species richness indices and evenness indices of the different steppe types are quantitatively analyzed based on the data measured from 16 representative plots in all the vertical zones in the middle section of northern slope of the Tianshan Mountains. The diversity indices of the different steppe types in middle section of northern slope of the Tianshan Mountains are in a sequence of montane meadow > meadow steppe > typical steppe > desert steppe > subalpine meadow > alpine meadow > desert, in which the species diversity is the highest in the steppe of Dactylis glomerata + Geranium pratense + forbs and the steppe of Geranium pratense + forbs + herbs in the montane meadow, but it is the lowest in the steppe of Salsola brachiata + Ceratocarpus arnarius and in the steppe of Nanophyton erinaceum in the montane desert. These differences are closely related to the ecological environment. The differences of composition, structure, function and dynamic change of the different steppe types are revealed by the species diversity of the steppes. The interaction between the diversity indexes and the biomass of steppes is researched by analyzing the correlation among the indices. The study results can provide the scientific basis for conserving the biodiversity resources in the study area.
出处
《干旱区研究》
CSCD
北大核心
2005年第2期225-230,共6页
Arid Zone Research
基金
新疆维吾尔自治区计委项目:新疆现代化畜牧业试验示范项目(2002476)
