Studies On Wild Ornamental Plants In Mila Mountain In Xizang (Tibet)

Tibet is famous for its various vegetation types and plant resources due to its unique natural and geographical conditions. With the rapid economic development in Tibet, it is great time to carry out the research and investigation on the wild plant resources in southeast Tibet. Mila Mountain--one of the areas which owns rich wild plant resources in southeast Tibet. Since few investigations and studies of plant resources in Mila Mountain was reported, detailed investigations and studies on wild plant resources in Mila Mountain was carried out in this research. Main results are as follows:(1) Line survey and sample survey were applied to carry out the investigation which ranges from29°13’～29°43’N to91°42’～94°21’E,2000-5300m, including Nyingchi Bayi Town and Maizhokunggar County located in Lhasa City. The east slope of Mila Mountain is the main investigation area. Through in-depth and detailed investigations, a total of102families,392genera,962species of wild vascular plants, including varieties, forma and subspecies, were identified in this area, with20families,34genera,80species of ferns;3families,9genera,14species of gymnosperms and79families,349genus,868species of angiosperms. After preliminary selection, there were82families,271genera,733species with ornamental value, including12families,17genera,38species of ferns;3families,6genera,11species of gymnosperms and67families,248genera and684species of angiosperms. According to the life types, wild ornamental plant resources in Mila Mountain were classified into ferns, liana plants, bamboo plants, woody ornamental plants and herbaceous ornamental plants.(2) According to diversity analysis of wild ornamental plant resources in Mila Mountain, the research has confirmed the dominant families and genera in this region.(3) Taking Poc (ornamental value coefficient), Pesp (unique coefficient), Pvol (volume coefficient), Pvar (the coefficient of variation within species), Pend (endangered coefficient) and Pmed (medicinal value coefficient) as the evaluation standards of K-means cluster analysis,46families,124genera and223species of the wild ornamental plants were selected and the preferential development sequence was sorted.(4) In view of existing factors threatening the wild ornamental plant resources in Mila Mountain, in-situ and ex-situ conservation should be applied to protect the resources.