关键词: 生物多样性, 空间格局, 中峰模式, 查旦乡, 三江源

Abstract: The diversity of large and medium-sized mammals and birds in the monitoring area of Chadan in the Sanjiangyuan region was surveyed in July 30 to August 2018.The survey recorded 9 mammals species and including 4 national key protected mammals.These 9 species belonged to 5 orders, 5 families and 8 genera. Equus kiang and Procapra picticaudata are dominant species in the region, with a proportion of 45.5% and 21.6% in mammals. A total of 52 birds species were observed in Chadan.These 52 species belonged to 11 orders, 26 families and 44 genera, including 11 species under national protected. Among birds, Passerine is the dominant species, accounting for 81.0% of the total number of individual birds. The study shows that the number of mammals’ and birds’ species in in different altitude has a significant difference(mammals:P＜0.001;birds: P＜0.001). The vertical distribution of mammals in monitoring area decreased with the increase of altitude, and it’s biodiversity is the highest to altitude from 4800m to 4849 m. The birds’ vertical distribution pattern conforms to the offset to the left ‘mid-domain effect’. The Shannon-Wiener index increases first and then decreases with increasing altitude. This study has mastered the composition of summer birds and mammals in the Chadan area of Sanjiangyuan region, enriched the data of birds and mammals in the Sanjiangyuan region and the Tanggula Mountains, and it provides a case study for the spatial distribution pattern of species at small scales.

Key words: Biodiversity, Spatial autocorrelation, Mid-domain effect, Chadan Township, Sanjiangyuan