Abstract High irradiance utilization efficiency is one important character for some invasive plants. Chromolaena odorata is one noxious invasive species originating from Latin America, which had spread widely in most tropical and subtropical areas. To explore why C. odorata perform better than native plants in the understory of planted forests, we compared the irradiance utilization efficiency between invasive C. odorata and three co-occurring species (Merremia vitifolia, Pueraria phaseoloides, and Litsea monopetala). We found that C. odorata had lower leaf thickness but higher specific leaf area, net photosynthetic rate per leaf thickness and photosynthetic nitrogen use efficiency than the three native species. The photosynthetic resistance to irradiance damage was stronger for C. odorata than for the three native species. These traits may have contributed to the higher performance of C. odorata than native plants, which may in turn facilitate its invasion in the understory.

中文翻译：

---

一株林下侵入性红毛虫及其三种共生物种辐照利用效率的比较

摘要 高辐照利用效率是一些入侵植物的重要特征之一。Chromolaena odorata 是一种起源于拉丁美洲的有害入侵物种，已在大多数热带和亚热带地区广泛传播。为了探讨为什么在人工林的林下林木中，香椿比本地植物表现得更好，我们比较了入侵的香椿和三种共生物种（Merremia vitifolia、Pueraria phaseoloides 和 Litsea monopetala）之间的辐照利用效率。我们发现，与三种本地物种相比，C. odorata 具有较低的叶片厚度，但具有较高的比叶面积、每片叶片厚度的净光合速率和光合氮利用效率。C. odorata 对辐照损伤的光合抗性比三种本地物种更强。