|Analysis of elevation pattern of seed flora on the south slope of Budanla mountain in southern Tibet, China
WANG Junwei1, MING Shengping2, YANG Kun1, HE Min1, LA Qiong1
1.College of Sciences,Tibet University;2.Yunnan Lijiang Forest Ecosystem National Observation and Research Station,Kunming#$NBSInstitute#$NBSof#$NBSBotany,#$NBSChinese#$NBSAcademy#$NBSof#$NBSSciences,Yunnan Lijiang
|The ecotone of ecological communities is usually rich in species and complex in floristic components, which is regarded as a key zone. Budanla Mountains is located in the transition zone of semi-humid to semi-arid ecological environment in Tibet. Because of its special natural geographical environment, it has rich mountain plant diversity. However, the composition and floristic characteristics of seed plants in this important ecological transition area are still not well understood. In order to clarify the floristic composition and vertical distribution pattern of seed plants on the south slope of Budanla Mountains, the floristic characteristics of seed plants on the south slope of this mountain were systematically studied through field plant community quadrat investigation, laboratory specimen identification and related literature review in this paper, the richness pattern of advantage genera and geographical composition along the altitude gradient was also explored. The results showed that there were approximately 316 species of seed plants belonging to 45 families and 156 genera in the south slope of Budanla Mountains, in which there were the most abundant single species and small genera of seed plants. The temperate distribution type is dominant at the genus and species level. In the vertical distribution gradient of geographical elements, the temperate distribution type has a peak value at 4000 m, including 53 genera, and shows a downward trend with the increase of altitude. The nature of floristic geographical elements and the vertical distribution of species richness in this area are affected by the local semi humid climate, local environmental factors and topography. The results of this study have important scientific significance for the protection of plant diversity and the construction of ecological barriers in the region.
|Key words: Flora, Elevation gradient, Plant diversity, Phytogeography, Budanla Mountain