粤北大东山种子植物区系研究

大东山位于广东北部，地理位置约为２４°５０′～２５°００′Ｎ，１１２°３７′～１１２°４７′Ｅ。大东山有种子植物１６１科，５６０属，１１２４种。其中裸子植物６科，１０属，１４种；被子植物１５５科，５５０属，１１１０种。大东山区系的表征科是蔷薇科、樟科、茶科、壳斗科、山矾科、冬青科、木兰科、安息香科和金缕梅科。属的地理成分组成为热带分布属占５４．３４％，温带分布属占４５．６６％。本区系与江西九连山及福建武夷山区系有密切的联系，与黑石顶、大瑶山和花坪区系的联系也较紧密。大东山区系属华南地区的一部分。

A STUDY ON THE SEED PLANT FLORA OF DADONGSHAN IN NORTHERN GUANGDONG

Dadongshan Mountain is situated in northern Guangdong province, at about latitude 24° 50′ ～25° 00′ N, longitude 112° 37′ ～112° 47′ E. The seed plant flora of Dadongshan consists of 161 families, 560 genera and 1 124 species. of these, there are 14 species of gymnosperms belonging to 10 genera and 6 families, 1 110 species of angiosperms belonging to 550 genera and 155 families. Based the geographical distribution, the genera of this flora are classified into 14 distribution types. the main geographical elements are Pantropic, North Temperate, Tropical Asia. East Asia, East Asia and North America disjuncted. Various tropical elements make up 54.34% of the flora. Compared with six mountainous regions, this flora is quite similar to the flora of Wuyishan Mountain in Fujian and Jiulian Mountain in Jiangxi.