广东省乐昌县植物区系的初步研究

本文通过对乐昌县维管束植物科属的分析研究,试图探讨本区系的基本组成、特征与分布,为研究广东植物区系,乃至中国植物区系提供基本资料。 乐昌县地处广东的最北部,地理位置位于北纬24°57′—25°31′,东经112°51′—113°34′之间,面积达239100 ha。 区内有维管束植物1603种(包括变种及变型),分隶205科,781属。其中蕨类植物37科,75属,147种;裸子植物8科,14属,18种;被子植物160科,692属,1438种。 从科的分析表明,本区系的表征科由猕猴桃科、安息香科、山矾科、茶科、木兰科、壳斗科、冬青科、水龙骨科等组成。 根据属的现代地理分布,本区与世界各部分有不同程度的联系,其中以泛热带、北温带、东亚、热带亚州的成分最多,而地中海、温带亚洲、旧世界则很少联系。 与邻近地区比较,与湘南联系最高,其次是广西大瑶山,黑石顶低一些。

A PRELIMINARY STUDY ON THE FLORA OF LECHANG COUNTY, GUANGDONG

Lechang county is located in north of Guangdong Province, at 24°57'-25°31' N. and 112°51'- 113°34' E., with an area of 239100 ha. The flora of Lechang consists of 1603 species of vascular plants belonging to 781 genera and 205 families. Of these, there are 147 species of ferns belonging to 75 genera and 37 families, is species of gymnosperms belonging to 14 genera and 8 families, 1438 species of ang-iosperms belonging to 692 genera and 160 families. The dominant families are Magnoliaceae, Lauraceae, Rosaceae, Fagaceae, Euphorbiaceae, Papilionaceae, Mora-ceae, Myrsinaceae, Styracaceae, Symplcaceae, Aquifoliaceae, Rutaceae and so on. According to the geographical distribution of spermatophytic genera in Lechang, there may be divided into 14 types, of which Pantropic, N. Temperate, E. Asia and Tropicol Asia are the main elements of the flora. There are a few Mediterranea, Temperate Asia and Old World Temperate elements in this flora. Comparing the composition of the flora with those of 3 neighbouring regions, the flora of Lechang is quite similar to those of South Hunan. The coefficient of generic similarity between them is 78%. The flora belongs to South China Region, Sino-Japan Forest Subkingdom, Holartic Kingdom.