中文摘要：

江西南部是我国中亚热带的南缘、中亚热带和南亚热带的过渡区域,研究该区域外来植物及其对生态安全的影响具有一定的典型意义。结果表明：江西南部有外来植物111种（包括变种、变型）,隶属于47科84属,物种多样性较高。江西南部的外来植物的原产地涉及到世界5大洲;属的地理成分的特点以热带性成分为主;草本种数最多,高位芽植物也有较高的比例;有害外来植物只有13种。此外,有害外来植物具有三个特点,这些特点对我们进一步研究外来入侵植物的危害机理具有一定意义。

英文摘要：

Southern part of Jiangxi Province,which is called the transitional area from the middle subtropical zone to the southern subtropical zone,is located at edge of the southern subtropical zone in China. Because of this,studying on the alien plants in this area becomes a typical case to discuss the diversity and safety of alien plants in southern China. Based on this point,a study on the alien plants in the southern part of Jiangxi Province has been conducted to get the conclusions as follows：1）there are 111 species of alien plants in the southern part of Jiangxi Province,which belong to 47 families and 84 genus;2） the alien plants,which come from 5 continents in the world,show higher diversity in the southern part of Jiangxi Province; 3） the main geographic components of genus of the alien plants in this area are of tropical distribution type; among these alien plants,herb plants and phanerophytes have more numbers of species,harmful alien plants have only 13 species. Besides these,the harmful alien plants in southern Jiangxi show three characteristics which will help us approach the mechanism of invasive alien plants in China.