鼎湖山自然保护区野生种子植物区系特征

基于野外调查和文献资料整理，构建了鼎湖山自然保护区野生种子植物名录，并对植物区系特征进行了分析。结果表明：鼎湖山自然保护区野生种子植物资源丰富，包含1755种，隶属于171科783属；区系科属组成具有明显的亚热带特征；区系表征科包括樟科、桑科、壳斗科、冬青科、五列木科、山茶科、山矾科、菝葜科、清风藤科和五味子科共10科。植物区系的地理成分以热带性成分占明显优势，热带性科97科及温带性科30科分别占非世界性科总数的76.38%和23.62%，热带性属566属及温带性属161属分别占非世界性属总数的77.86%和21.19%，科属的热带性成分与温带性成分的比值介于中亚热带地区与热带北缘地区之间，与该区域所处的南亚热带季风气候带性质相符。在种级水平上，热带东南亚至印度—马来，太平洋诸岛分布型种占非世界性种总数的45.25%，优势性明显，体现该区域植物物种与热带亚洲植物区系的紧密联系；另外，中国特有分布型种217种，占非世界种总数的13.38%，种级水平特有现象明显。

Floristic Characteristics of Wild Seed Plants in Dinghushan Natural Reserve

Based on our own investigations and a literature search, we constructed a list of wild seed plants in Dinghushan Nature Reserve, and analyzed the floristic characteristics of this region. The results indicated that 1755 wild seed plants belonging to 171 families and 783 genera are distributed in Dinghushan Natural Reserve. The floristic composition of families and genera has obvious subtropical characteristics, and there are 10 characteristic families including Lauraceae, Moraceae, Fagaceae, Aquifoliaceae, Pentaphylacaceae, Theaceae, Symplocaceae, Smilacaceae, Sabiaceae and Schisandraceae in the flora. The geographical areal-types in the flora are dominated by tropical elements that 97 tropical families and 30 temperate families account for 76.38% and 23.62% of the total non world families, respectively, while 566 tropical genera and 161 temperate genera account for 77.86% and 21.19% of the total non world genera, respectively. The ratio of tropical component to temperate component of families and genera is between that of the central subtropical region and the northern edge of the tropics, which is consistent with the characteristics of the south subtropical monsoon climate zone. At the species level, the species distributed in the Tropical Southeast Asia to Indo-Malaya and Tropical Southwest Pacific Islands areal-type account for 45.25% of the total non world species, which reflects the close relationship between the plant species in this region and the flora of tropical Asia. In addition, endemic phenomenon at the species level is obvious that 217 species are endemic to China, accounting for 13.38% of the total number of non world species.