湖南长沙生态入侵植物群落重要值研究

利用3个特征指标综合为重要值的定量方法,测定入侵植物在群落组成中的地位与作用.结果表明:生态入侵植物分布的生境类型表现出多样化;在各区域中,入侵植物种类随着人为活动干扰的强度的增加而先增后减,其对当地生态系统结构和功能以及生物多样性的影响是随着人为活动干扰的强度增加而增加.根据样地中群落优势种和外来植物重要值的情况确定了危害最严重的几种外来植物是空心莲子草、吊球草、两耳草、婆婆纳.

Study on the Importance Value of Exotic Plants Community in Changsha of Hunan Province

The quantitative method,which importance value was synthesized from three characteristic indexes,was applied to the determination of the status and function of exotic plants.The result showed that the habitat form of exotic plants displayed diversify.With the interference increasing of human,the species of exotic plants increased at first and then declined,but the influence of exotic plants on structure,function and biodiversity of local ecosystem increased.Base on the dominate species of community and importance value of exotic plants,the most harmful exotic plants in Changsha were Alternanthera philoxeroide,Hyptis rhomboidea,Paspalum conjugatum and Veronica polita.