Shan Liping, Hou Meng
Key Laboratory of Wetland Ecology and Environment, State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China.
Plant Divers. 2023 Oct 6;46(5):640-647. doi: 10.1016/j.pld.2023.09.002. eCollection 2024 Sep.
Alien plant invasion success can be inhibited by two key biotic factors: native herbivores and plant diversity. However, few studies have experimentally tested whether these factors interact to synergistically resist invasion success, especially factoring in changing global environments (e.g. nutrient enrichment). Here we tested how the synergy between native herbivores and plant diversity affects alien plant invasion success in various nutrient conditions. For this purpose, we exposed alien plant species in pot-mesocosms to different levels of native plant diversity (4 . 8 species), native generalist herbivores, and high and low soil nutrient levels. We found that generalist herbivores preferred alien plants to native plants, inhibiting invasion success in a native community. This inhibition was amplified by highly diverse native communities. Further, the amplified effect between herbivory and native plant diversity was independent of nutrient conditions. Our results suggest that a higher diversity of native communities can strengthen the resistance of native generalist herbivores to alien plant invasions by enhancing herbivory tolerance. The synergistic effect remains in force in nutrient-enriched habitats that are always invaded by alien plant species. Our results shed light on the effective control of plant invasions using multi-trophic means, even in the face of future global changes.
本地食草动物和植物多样性。然而，很少有研究通过实验来测试这些因素是否相互作用以协同抵抗入侵的成功，尤其是考虑到不断变化的全球环境（例如养分富集）。在这里，我们测试了本地食草动物与植物多样性之间的协同作用如何在各种养分条件下影响外来植物入侵的成功。为此，我们将盆栽中型生态系统中的外来植物物种暴露于不同水平的本地植物多样性（4至8种）、本地广食性食草动物以及高和低土壤养分水平下。我们发现，广食性食草动物更喜欢外来植物而非本地植物，从而抑制了本地群落中的入侵成功。这种抑制作用在高度多样化的本地群落中会被放大。此外，食草作用与本地植物多样性之间的放大效应与养分条件无关。我们的结果表明，更高的本地群落多样性可以通过增强食草耐受性来加强本地广食性食草动物对外来植物入侵的抵抗力。这种协同效应在总是受到外来植物物种入侵的养分富集栖息地中仍然有效。我们的研究结果揭示了即使面对未来的全球变化，利用多营养级手段有效控制植物入侵的方法。
