| Beijing Wulingshan Nature Reserve is situated in the transitional region from warm-temperate zone with deciduous broad-leaved forests to temperate zone with coniferous and broad-leaved mixed forests, its biodiversity is very high. According to our investigation, the wild vascular plants in Beijing Wulingshan Nature Reserve are 702 species (containing varieties) which belong to 362 genera and 101 families. Among them are fern plants 13 families, 21 genera and 43 species, seed plants 88 families, 341 genera and 659 species. Cultivated plants also exist in this region, including 26 families, 34 genera and 38 species. There are a few species here which never recorded in Beijing before(including Aegopodium, Rheum palmatum and Aegopodium alpestre) and this place is also a newly recorded distribution place for some species(including Lychnis cograta, Forsythia suspensa, Galium maximo, Saussurea japonica and Henerocallis esculenta). The flora geographical composition is complex, and the dominant characteristics of flora are temperate zone plants which account for above 50%.According to importance value, the vegetation in Beijing Wulingshan Nature Reserve can be classified into 3 vegetation type groups, 5 vegetation types, 42 formations and 139 associations.To evaluate plants in this region, the author classifies most of the plants into 5 grades according to the amount of the plants and the plant appearance frequency. The result is that 12 species in the I grade, 26 species in II, 68 species in III, 134 species in IV, 233 species in V, and the rest are not evaluated because of data deficiency.After the calculation and t-test, Phellodendron amurense population is of clumped spatial pattern, the expansion ability is poor, and Phellodendron amurense population has negative associations with Tilia amurensis and Juglans mandshurica, they compete with each other. As for the protection measures, we can think about cultivating some Phellodendron amurense in other regions in this nature reserve.
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