广东肇庆石灰岩植物区系的基本特征

肇庆石灰岩共有维管植物９１科２２６属３０３种。经过对种子植物、蕨类植物地理成分分析和与邻近植物区系比较，表明肇庆石灰岩植物区系服从植物地理分带规律，以热带－亚热带分布成分为主体，表现出明显的南亚热带南缘植物区系性质；同时显示出岩溶基质特点；与紧邻的土山植物区系具有完全迥异的表征科。区系区划上属于华南植物区，位于粤中亚区与粤西－桂中亚区的汇合点

The plant flora of Zhaoqing limestone area in Guangdong province

Zhaoqing limestone area has a long geological history and is one part of Cathaysia Ancient Land The flora of this area has been developed together with the adjacent acid soil flora of Dinghu and Heishiding mountains obeyed the plant zonal distributing regularity But due to the special karst environment it had differentiated out some new species, such as: Lindenbergia fungkaiensis Miau et Can, sp nov Acalypha wui H S Kiu, Trigonostemon yiuchani, sp nov By analysising the vascular flora of Zhaoqing limestone area 303 vascular species belonging to 226 genera and 91 families found in this area, the results show the tropical and subtropical elements are the dominants of the flora, occupying 75 % of the total genera; The flora of this area is similar to the adjacent acid soil flora , but it appears both south subtropical and karst characteristics and is related to those flora of Longgang in Guangxi and Dongyangshan in Guizhou by the karst elements, and the relationship with the former is closer than with the latter So, the flora belongs to the South China Region, being at the joint point of Center Guangdong Subregion and West Guangdong and Center Guangxi Subregion