(山弄)岗植物区系考察报告

<正> 前言 一、鼻岗植物区系的组成 (一)科、属、种的统计 (二)10种以上的科的统计 (三)含10种以上的科在世界区系中的比重 (四)含10种以上的科在广西区系中的比重 (五)木本植物统计。 二、鼻岗植物区系的特点 (一)热带边缘性质 (二)特有性 (三)岩溶特性 三、鼻岗植物区系的地形分布特点及生态变化 (一)谷地、山坡、崖顶的分布概况 (二)水平分布的差异 (三)生态变化 四、鼻岗植物区系与邻近地区植物区系的关系 (一)与中印半岛的关系 (二)与海南岛的关系 (三)与广西阳朔的关系 (四)与花坪的关系 (五)与马来半岛岩溶植物区系的关系 (六)总的比校

A REPORT ON THE EXPLORATION OF THE FLORA OF LONGGANG

Longgang is a protected area, a type of limestone karst forest located on the edge of tropical zone which occupied a part of the two districts of Longzhou and Ningming in southwest Guaagxi. It' s area about 101 kilometre squares. Depending on 2271 specimens collected by twice explorations in 1979 and 1980, the flora counted for pha nerogams iaciading 172 families, 709 genera and 1454 species: of which, 91 species of 40 genera and of 23 families pertaining to pteridophyta; 5 species of 3 genera and of 3 families to Gymnospermae; 1131 species of 541 genera and of 118 families to Dicotyledoneae; 227 species of 112 genera and of 25 families to Moaocoty-ledoneae. The principal families of this flora are the dominent families of tropically floras of Tonkin Gulf and Hainan Island, such as Euphorbiaceae, Sa-pindaceae, Meliaceae, Tiliaceae, Guttiferae, Moraceae, Leguminosae, Sapotac-eae, Burseraceae, Anacardiaceaee, Palmae and Myristicaceae. There are 26 families its species number over 1% of those of the World Flora; of which there are 15 families of tropical families, i. e. Menispermaceae, Rutaceae, Moraceae, Cucurbitaceae, Sterculiaceae, Anacardiaceae, Zingiberaceae, Myrs-inaceae, Euphorbiaceae, Capparidaceae, Asclediadaceae, Meliaceae, Flacourti-aceae, Apocynaceae, Annonaceae. That means the Longgang flora prominent in tropical nature.Among the endemic species of Tonkin Gulf, Hainan Island and Guang-xi have been discovered at past time, there are 67 species of which also seen in Longgang. They are pertaining to 55 genra of 33 families. The most dominant family is Euphorbiaceae. It contents 9 species of 8 genera.In the Angiospermae, there are 170 species being the proper calciphilous plants specialized habited on limestone hills only, they pertaining to 126 genera of 61 families, 13% of the total species of Angiospermae in Long-gang. There are 379 species being the informal calciphilous plants pertaining to 349 genera of 109 families, 28% to the total species of Angiospermae in Longgang.The familiar indicis between Longgang and Indo-china are 88% and 24% separately to genus and species; and between Longgang and Hainan Island are 82% and 49% separately to genus and species. The genus familiar index between Longgang and Huaping Protected Area (northeast Guangxi) is 44%. Between Longgang and the limestone hill flora of Malaya Peninsula, the familiar indicis of genus and species separately 49% and 5%.Longgang Flora belongs to paleotropic kingdom, Malaysian subkingdom, Tonkin Gulf region, Southwest Guangxi province, Longgang district.