摘要
黔桂边境六县植物区系有维管束植物203科921属2255种(变种)。其中种子植物含25种以上的有22科,代表成分有樟科、山茶科、壳斗科、五加科、桑科和椴树科。区系的特点是:地理成分复杂、分布交错;热带、亚热带性质明显;区系起源古老;特有珍稀种类多;喜酸成分较喜钙成分占优势;草本与木本种类近等。此外,对本区系自然条件及植物资源利用也作了简述。
This article deals with the floristic composition and characteristics of six counties in Guizhou and Guangxi border.1. There are about 203 families, 921 genera and 2255 species (varieties) of the vascular plants in this flora. There are 22 families which contain 25 or more than 25 species. Its principal representative families are: Lauraceae, Theaceae, Fagace-ae, Araliaceae, Moraceae, Tiliaceae, Myrsinaceae, Celastraceae, Verbenaceae, Acan-thaceae and Urticaceae.2. The fundamental features of this flora may be summarized as: ① Complex in geographical elements, tropical and subtropical in nature. According to the distributional comparative analysis of 175 families and 863 genera of seed plant in this flora, we can divide them into 5 distribution types of families and 15 distribution types of genera in China. The amount ( percentage ) of distribution types of these families and genera are in sequence: tropical 86 ( 49.1% ) and 509 ( 59.2%), temperate 32(18.3%) and 208(24.0%), Mediterranean 1(0.6%) and 11 ( 1.2%),Endemic in China 2 ( 1.2% ) and 17 (1.9% ) , cosmopolitan 54 ( 30.8% )and 118 ( 13.7%). ② There are many transitional elements here. ③ The origin of this flora is ancient. There are many ancient families and genera as well as many relic species: 28 families, 58 genera and 111 species of ferns and 15 families, 51 genera and 146 species of spermatophytes are genetically ancient or primitive. ④ Endemic elements are rich. The monotypic and oligotypic families are Sargentodoxaceae, Euco-mmiacae and Rhoipteleaceae. There are 21 monotypic and oligotypic genera: Chu-krasia, Toongiodendron, Sargentodoxa, Cleidiocarpon and Delvaya, etc. There are 16 endemic genera of China: Dysosma, Malania, Cyclocarya,Pteroceltis, Handeliodendron, Chingiacanthus, ect. ⑤ The rare and precious species are rich. The protective species in China are 24 species. ⑥The species liking acid soil are more than that of liking calcareous. There are 92 species in the former (about 4.2%) and 298 species in the latter (about 13.2%). ⑦
出处
《广西植物》
CAS
CSCD
北大核心
1990年第4期297-306,共10页
Guihaia
关键词
植物区系
植物区系组成
Six counties in Guizhou and Guangxi border
Floristic composition and characteristics
