Aboveground herbivory can promote exotic plant invasion through intra- and interspecific aboveground–belowground interactions
Aboveground herbivory can promote exotic plant invasion through intra- and interspecific aboveground–belowground interactions
复制标题
地上食草可以通过种内和种间地上地下相互作用促进外来植物入侵
DOI：
10.1111/nph.18520
复制
发表时间：
2022
期刊：
影响因子：
9.4
通讯作者：
Xinmin Lu
中科院分区：
文献类型：
--
作者：
Lunlun Gao;Chunqiang Wei;Yifan He;Xuefei Tang;Wei Chen;Hao Xu;Yuqing Wu;Rutger A. Wilschut;Xinmin Lu
地下食草动物和土壤生物区系深刻地影响植物入侵。为了探讨外来植食性昆虫Agasicles hygrophila对空心莲子草入侵的影响，我们结合多年的野外调查和为期2年的PSF试验，研究了植食性昆虫如何影响植物-土壤反馈（PSFs）对本地植物和外来植物以及外来甲虫的影响。2014 - 2019年，喜旱莲子草相对于同属无柄莲子草的优势度基本保持不变，但无柄莲子草在低丰度时也经历了类似的食草动物损害，表明存在明显的竞争效应。我们的实验表明，对喜旱莲子草的草食改变了土壤微生物群落，延长了其对无柄莲子草的负PSF，并降低了对下一代入侵植物的嗜湿莲子草的繁殖性能。因此，当生长在被引入的甲虫落叶的入侵植物所调节的土壤中时，喜旱莲子草在本地植物的叶子上比入侵植物的叶子上表现得更好。我们的研究结果表明，地上草食动物可能通过增强其土壤介导的自我增强来促进而不是抑制喜旱莲子草的入侵，这为植物入侵提供了一种新的机制理解。这些研究结果突出表明，在评估潜在的生物防治剂时，需要纳入地上-地下的观点。
Aboveground herbivores and soil biota profoundly affect plant invasions. However, how they interactively affect plant invasions through plant–soil feedbacks (PSFs) remains unclear.To explore how herbivory by the introduced beetleAgasicles hygrophilaaffectsAlternanthera philoxeroidesinvasions in China, we integrated multiyear field surveys and a 2‐yr PSF experiment, in which we examined how herbivory affects PSFs on the performance of native and invasive plants and the introduced beetles.Despite increased herbivory fromA. hygrophila,A. philoxeroidesdominance over co‐occurring congeneric nativeAlternanthera sessilisremained constant from 2014 to 2019.While occurring at lower abundances,A. sessilisexperienced similar herbivore damage, suggesting apparent competitive effects. Our experiments revealed that herbivory onA. philoxeroidesaltered soil microbial communities, prolonged its negative PSF onA. sessilis, and decreasedA. hygrophilalarvae performance on the next‐generation invasive plants. Consequently,A. hygrophilalarvae performed better on leaves of natives than those of invasives when grown in soils conditioned by invasive plants defoliated by the introduced beetles.Our findings suggest that aboveground herbivory might promote rather than suppressA. philoxeroidesinvasion by enhancing its soil‐mediated self‐reinforcement, providing a novel mechanistic understanding of plant invasions. These findings highlight the need to incorporate an aboveground–belowground perspective during the assessment of potential biocontrol agents.