中文摘要：

为了解入侵植物牛膝菊与白车轴草的竞争效应,采用盆栽取代试验方法观察不同密度、不同比例条件下两种植物的竞争表现,定量分析其单株生物量和竞争能力,为探究牛膝菊入侵机理和生物替代提供理论依据.结果表明,混种时白车轴草的生长受到牛膝菊的竞争抑制作用;在不同种植密度下,牛膝菊和白车轴草混种和单种时的单株生物量均表现出随密度增加而下降的趋势;在不同密度、不同比例种植条件下,牛膝菊的相对产量（RY）＞1,差异显著;相对产量总和（RYT）＞1,差异不显著;相对攻击力系数（A）＞0;牛膝菊有可能通过种间竞争将白车轴草排除种群,在牛膝菊和白车轴草混种时,白车轴草处于劣势;种植密度、种植比例及密度×比例对牛膝菊和白车轴草的竞争力没有显著影响.

英文摘要：

In order to understand the competitive effect between Galinsoga parviflora and Trifolium repens, a greenhouse competition experiment was conducted with invasive plant G.porviflora and T.repens, with different densities and proportions of combination, to investigate their competitive behavior and the growth response, and relative competitive ability was evaluated. The results were as follows： The relative competitive ability of G.parviflora was higher than this of T.repens in the mixed planting. The individual biomass of G.parviflora and T.repens decreased as the density enhanced with monocuhure and mixed planting in different densities. The RY value of G.parviflora was significantly greater than 1, however, the PYT value of G.parviflora was not significantly greater than 1, the A value of G.parviflora was significantly greater than zero of all test densities, when mixed planting and monoculture, indicating that the competitive ability of G.parviflora was stronger than T.repens. The density, proportion, density x proportion had no significant effect on competitive ability between G.parviflora and T.repens.