大巴山自然保护区种子植物区系组成分析

大巴山自然保护区是国家级自然保护区，其种子植物区系具有以下特征：植物种类丰富，共有自然生种子植物157科904属2798种．植物区系优势科、属明显，含20种以上的优势科数虽只占总科数的26．75％，但其所含属数和种数却分别占总属数和总种数的69．8％和74．21％，含6种以上的120个优势属所含的种数占区内总种数的45．57％，这些科、属在本区系组成中占明显的主导地位．分布区类型多样，地理成分复杂，泛热带成分丰富，温带性质明显，并与热带成分有广泛的联系，表现出一定的过渡性．特有和珍稀濒危植物资源丰富，植物区系具有古老、孑遗、原始性．

An Analysis of Seed Plants Floral Composition in Dabashan Nature Reserve

The Dabashan Nature Reserve is one of the national grade nature reserve. By the analysis of the flora of the seed plants in this area, some characteristics are found: It is abundant in wild species, containing 2 798 species of seed plants which belong to 904 genera and 157 families. The dominant families and genera are prominent. These families containing 20 species more only account for 26.75% of overall families, but genera account for 69.8% of overall genera, and species for 74.21% of overall species. The 120 dominant genera containing 6 species more account for 45.57% of overall species. They take up dominant degree. The types of distribution are various and geographical elements are complex. Subtropical elements are plentiful. Dominance of temperate elements is obvious. It has much in common with tropical flora, and shows some transitional nature. Endemic plants and rare and endangered plants are plentiful, too. The flora is archaic, relic and pristine.