Species Diversity,Geographic Patterns and Their Underlying Mechanisms of the Threatened Plants in Northwest Yunnan

The Northwest Yunnan is one of the global hotspots of species diversity,geographic patterns and their underlying mechanisms of the threatened plants in Northwest Yunnan threatened plants.Based on the large-scale distribution information of the threatened plants,statistic and GIS spatial analysis,we investigated species diversity,geographic patterns and their underlying mechanisms of the threatened plants in Northwest Yunnan.The results showed that the Northwest Yunnan held 64threatened plant species,subordinated in 60genus and 42families.With the increase of latitude,an increasing trend can be observed on the species diversity of threatened plants(R2=0.17,p0.01).Our results also showed that 81.3%of the threatened plants distribution range was very narrow(only occurred in 1~2spatial units).Statistical analysis showed that species diversity of endemic plants may be the dominant factor for the spatial patterns of threatened plant species(R2=0.58,p0.01).It may imply that the narrow habitat may be one of the major underlying mechanisms for the patterns of threatened plants in Northwest Yunnan.Therefore,the protection of their narrow habitat was one of the important counter-measures to protect the threatened plants in Northwest Yunnan.