雅鲁藏布江下游地区兰科植物濒危程度和优先保护序列研究

在对雅鲁藏布江下游地区兰科（Orchidaceae）植物资源进行调查的基础上，结合资料收集和标本查阅，利用多个评价指标定量计算各濒危植物的优先保护值，确定该区域珍稀濒危兰科植物的濒危等级和优先保护序列。结果表明：对雅鲁藏布江下游地区的60属156种濒危兰科植物濒危等级进行评价，其中处于极危（CR）状态的有15种，处于濒危（EN）状态的有46种，处于易危（VU）状态的有78种，处于近危（NT）状态的有17种；优先保护范围值为0.853 9~0.416 8，其中被划分为Ⅰ级保护植物有45种，Ⅱ级保护植物有72种，Ⅲ级保护植物有39种。该研究结果与各种保护植物名录的濒危程度和优先保护级别存在较大差异，大部分兰科植物在该区受威胁程度加强，与这些兰科植物在雅鲁藏布江下游地区现实生存状态基本保持一致，对该区域兰科植物的保护迫在眉睫，应引起足够重视。

Study on Endangered Degree and Priority Conservation Sequence of Orchids in the Lower Reaches of Yarlung Zangbo River

Based on the survey of orchid resources in the lower Yarlung Zangbo River region， the priority protection value of each endangered plant was quantitatively calculated using multiple evaluation indexes to determine the endangerment level and priority protection sequence of rare and endangered orchids in the region by combining data collection and specimen review. The endangerment level of 156 species of endangered orchids in 60 genera in the lower Yarlung Zangbo River region was evaluated， among which 15 species were in critically endangered（CR） status， 46 species in endangered（EN） status， 78 species in vulnerable（VU） status and 17 species in near threatened（NT） status； the priority protection range value was 0.853 9-0.416 8， among which 45 species were classified as Class Ⅰ protected plants， 72 species as Class Ⅱ protected plants， and 39 species as Class Ⅲ protected plants.The results of this study differ greatly from the endangered degree and priority protection level of various protected plant lists， and most of the orchids are under enhanced threat in this region， which is consistent with the real survival status of these orchids in the lower Yarlung Zangbo River area， and the protection of orchids in this region is urgent and should be given sufficient attention.