我国南沙群岛的植物与植被概况

南沙群岛是我国最南端的一个植物地理区域，但目前我国植物学家对这里的植物与植被还了解得不多。本文通过实地考察个别人工岛，并广泛收集国内外的有关文献资料，概述了南沙群岛的植物与植被的组成、特点及其与邻近地区植物区系的关系，为我国南海岛屿植物区系的研究提供基本资料．

STUDY ON THE FLORA AND VEGETATION OF NANSHA ISLANDS, CHINA

Nansha Islands are situated in the southern part of South China Sea, at 6 14°N., with an altitude of 1.8-6 m. The major types of vegetation are the evergreen coral island forest, scrub forest and beach vegetation. The dominant species of the forest communities are Cordia subcordata, Scaevola sericea and Terminalia catappa.So far as we know, there are 48 species of vascular plants belonging to 31 families and 45 genera in this area. All of them are immigrants by various ways from the neighboring continents and islands. The families of the flora are Rubiaceae, Boraginaceae, Goodeniaceae, Papilionaceae, Convulvulaceae, and Poaceae etc. A few species such as Triumfetta repens. Clitoria mocrophylla, Ochrosia borbonica and Ipomoea gracilis are found only in Nansha Islands, but not recorded elsewhere in China. All genera in the flora are tropical element, of which pantropic genera with 81.48% of total genera is the largest part. In this area there is no species endemic to itself, which may be ascribed to its very young flora in geological respect.