色季拉山冬虫夏草适生地草甸地表节肢动物群落多样性

Ground-dwelling arthropods communies in different habitat of Cordyceps sinensis in Mt.Segrila of Tibet

为了解冬虫夏草适生地地表节肢动物多样性水平,2009年和2010年连续采用陷阱法对色季拉山3类典型的冬虫夏草适生草甸(山坡草甸、林缘草甸和滩地草甸)进行了调查。物种累积曲线和种积丰度估值反映,采集抽样充分。标本由14目、62科、114种组成,3类生境的类群组成相似,但数量分布明显不同,山坡草甸、林缘草甸和滩地草甸的优势类群分别为拟步甲科、蚁科和鳞科。通过各生物多样性指数和物种-相对多度分布模型比较可知,滩地草甸的多样性、丰富度和均匀度均低于另外两种生境。分析推测,冬虫夏草适生地地表节肢动物多样性与微生境的热量条件和人为干扰紧密相关。

In order to determine the diversity of ground-dwelling arthropods in the habitat of Cordyceps sinensis,pitfall trap methods were used to collect arthropods in three different meadow types in Mt. Segrila of Tibet,from June 2009 to November 2010. Species accumulation curves are used and the results showed that sampling effort is sufficient. A total of 114 species belonging to 14 orders and 62 families were identified. There were obvious differences in individual number distribution of ground-dwelling arthropod assemblages among three meadow types; however,the similar taxa were obtained in different habitats. The most dominant family was Tenebrionidae,Formicidae and Tomoceridae in Slope meadow,Forest meadow and Typical meadow,respectively. All values of diversity indices（ richness,diversity and equitability）were in sequence of Forest meadow 〉Slope meadow 〉Typical meadow. In conclusion,the community composition of ground-dwelling arthropods have a closely relationship with thermal condition and artificial disturbance in the microhabitat of Cordyceps sinensis.