广东裸子植物区系的特点

广东省裸子植物共有８科１８属３４种，分别占中国同类的８０．０％，５２．９％和１７．６％。其中泛热带分布２属，热带亚洲至热带大洋洲１属，热带亚洲１属，北温带５属，东亚和北美间断分布１属，东亚分布３属，中国特有分布５属，即热带成分共仅４属占２２．２％，而亚热带至温带成分１４属占７７．８％为绝对优势。分析表明：广东裸子植物区系体现了东亚裸子植物区系的特点，其原始中心和现代分布中心都在中国亚热带。同时论文还将广东裸子植物种的分布区类型划分为２０个亚型。

THE CHARACTERISTICS OF GYMNOSPERMOUS FLORA FROM GUANGDONG PROVINCE

The gymnospermous flora of Guangdong province consists of 8 families 18 genera and 34 species, among them, 1. Pantropic 2 genera; 2. Tropical Asia and Tropical Australasia 1 genus;3. Tropical Asia (Sw China-S China -E China) 1 genus; 4. North Temperate 5 genera; 5. East Asia and North America disjuncted 1 genus; 6. East Asia 3 genera; and 7. endemic to China 5 genera. In the whole, there are a few the tropical composition (only 22.2% ), and an abundant of the subtropical to temperate (up to 77.8% ), this may constrast with angiospermous flora, of which tropical one is dominant in Guangdong. According to an analysis for the floristic elements of guangdong's Gymnospermae, results show that their primordial and present distributed centreis in the Subtropic of China. Meanwhile, the species areal-types of Guangdong Gymnospermae were divided into 20 subtypes in this paper.