Invasive plants may be more plastic than non‐invasive plants and maintain high fitness under various environmental conditions. Previous studies mainly focused on the comparisons between invasive and native plants, and comparisons between highly invasive and less invasive exotic species are still relatively rare, especially for comparisons at the subspecies level. This study examined the effects of nutrient addition and shading on the performance of the highly invasive Mimosa invisa and its less invasive subspecies M. invisa var. inermis under either isolated or competitive conditions. Nutrient addition increased biomass and plant height and decreased root‐to‐shoot ratio (R/S). Shading decreased biomass and R/S and increased plant height. Under isolated conditions, the two invaders did not differ in R/S, plant height and plasticity of these traits in response to nutrient addition or shading, and the two invaders also did not differ in biomass production under each of the nutrient and light treatments. When the two invaders competed with each other, M. invisa outcompeted M. invisa var. inermis under high soil nutrient conditions, and the two invaders did not differ in performance under other growth conditions. Thus, only considering competition may we find out the difference between highly invasive species and their closely related, less invasive subspecies. Management of M. invisa should focus on habitats with high soil nutrient availability, in which M. invisa is more likely to dominate.

中文翻译：

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在不同养分和光照条件下高侵害性含羞草及其低侵染性亚种的比较性能

侵入性植物可能比非侵入性植物更具塑性，并在各种环境条件下保持较高的适应性。先前的研究主要集中在外来入侵植物与本土植物之间的比较，而高入侵性和低入侵性外来物种之间的比较仍然相对罕见，尤其是在亚种水平上的比较。这项研究检查了营养添加和遮荫对高侵害性含羞草及其低侵染性亚种M. invisa var的性能的影响。无形在孤立或竞争条件下。营养添加增加了生物量和植物高度，并降低了根茎比（R / S）。遮荫降低了生物量和R / S，增加了株高。在孤立的条件下，两个入侵者在响应营养添加或遮荫下的R / S，株高和这些性状的可塑性没有差异，并且在每种营养和光照条件下，两个入侵者的生物量生产也没有差异。当两个入侵者相互竞争时，M。invisa战胜了M. invisa var。无形在高土壤养分条件下，两个入侵者在其他生长条件下的性能没有差异。因此，只有考虑竞争，我们才能发现高侵入性物种与其密切相关，侵入性较小的亚种之间的差异。粘虫的管理应集中在土壤养分利用率高的栖息地上，其中粘虫更可能占主导地位。