摘要
本区计有野生维管束植物１７２科、５３２属、９７８种（包括变种、变型）。发现２新种，１新变种和３个广东新记录种。本区系的表征科为山茶科、壳斗科、桑科、芸香科、紫金牛科、樟科等，这些科大都是热带─亚热带分布式的，代表了本区系的性质。在属的地理成分中，本区以热带成分１７３属（占总数的３５．２％）和热带─亚热带成分１６９属（占总数的３４．４％）为主，说明了本区系具有由亚热带向热带过渡的南亚热带特性．本区与世界各区有着不同程度的联系，其中以与泛热带（占总数的３２．７％）、热带亚洲（占总数的１７．８％）和旧世界热带（占总数的１１．４％）联系最为密切，而与地中海、西亚、中亚、温带亚洲几乎没有联系。与邻近地区比较，本区系与古田、黑石顶的关系最为密切，其次是八宝山，与甘什岭、弄岗的关系较为疏远。排序结果表明小金河区系、古田区系和黑石顶区系应属同一类型─—南亚热带植物区系，它是中亚热带植物区系与热带植物区系之间的过渡类型．
The Xiaojinhe basin is located in Boluo County, Guangdong, at 23°10'￣23°20' N and 114°18'￣114°28'E. The floristic origin of the basin is old and the flora is rich in relic and ancient types. There are 978 species of wild vascular plants belonging to 172 families and 532 genera in the area. 2 new species and 1 new variety have been found, and 3 Spedes are new fecords to Guangdong. The characteristic families of the flora are Theaceae, Fagaceae, Moraceae, Rutaceae and Lauraceae ect., Most of them are of tropical-subtropical distribution. There are 173 tropical genera and 169 tropical-subtropical senera in the flora, accounting for 35. 2% and 34. 4% of the genus total in the basin, respectively.Geographical elements of the flora are complex and varied. They may be divided into 14types and 13 subtypes, in which Pantropic element (32. 7%) is the largest part of the flora, tropic element ranges the second, and Asia element (17. 8%) and the old world tropic element (11. 4%) the third Compared with 5 neighbouring florae, the Xiaojinhe flora is related closely with those of Gutian and Heishiding, and is aloof from those of Ganshiling and tonggang. The result of polar ordination method shows that the florae of the Xiaojinhe, Gutian and Heishiding belong to the same type.
出处
《热带地理》
北大核心
1995年第4期350-361,共12页
Tropical Geography
关键词
植物区系
极点排序
博罗小金河
广东
Flora I Polar ordination F yjaojjnhe i Boluo
Guangdong
