Clonal integration facilitating for the invasion of Alternanthera philoxeroides

多数恶性入侵水生植物都是克隆植物，阐明克隆整合属性对其潜在入侵性的影响对了解其入侵机制具有重要意义.以喜旱莲子草（Alternanthera philoxeroides）为研究对象，研究其克隆整合（匍匐茎连接）对入侵本地黄花水龙（Ludwigia peploides）种群时的光合性能、生长、竞争力和资源分配的影响，探讨克隆整合对该植物入侵性的贡献.结果表明，竞争显著降低了喜旱莲子草的光系统Ⅱ最大量子产量、总生物量、分株数和总匍匐茎长；但克隆整合却显著促进了竞争环境中喜旱莲子草的生长，提高了其光合特性、根冠比以及对本地物种的竞争力，因而有利于其入侵性的增强.;Many notorious alien invader are clonal plants,thus it is of great significance to understand the effect of clonal integra-tion on their potential invasiveness.This study investigated clonal integration (stolon connection) on the photosynthetic perform-ance,growth,competitive ability and biomass allocation of Alternanthera philoxeroides when it invaded the native Ludwigia pep-loides plant population,to explore the contribution of clonal integration on the invasion of this plant.We found that plant competi-tion significantly reduced the maximum quantum yield of photosystem Ⅱ,final biomass,ramet number and total stolon length of A.philoxeroides,whereas clonal integration greatly improved the photosynthetic performance,growth measures,significantly increased the competitive ability and root/shoot ratios of A.philoxeroides and facilitated its invasiveness.