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Herbivores alleviate the negative effects of extreme drought on plant community by enhancing dominant species
Journal of Plant Ecology ( IF 2.7 ) Pub Date : 2021-06-17 , DOI: 10.1093/jpe/rtab066
Chong Xu 1, 2 , Yuguang Ke 2 , Honghui Wu 3 , Melinda D Smith 4 , Nathan P Lemoine 5 , Weiguo Zhang 1 , Qiang Yu 2
Affiliation  

Abstract
Aims
Both extreme drought and insect herbivores can suppress plant growth in grassland communities. However, most studies have examined extreme drought and insects in isolation, and there is reason to believe that insects might alter the ability of grasslands to withstand drought. Unfortunately, few studies have tested the interactive effects of extreme drought and insect herbivores in grassland communities.
Methods
Here, we tested the drought–herbivore interactions using a manipulative experiment that factorially crossed extreme drought with the exclusion of insect herbivores in a temperate semiarid grassland in Inner Mongolia.
Important Findings
Our results demonstrated that both extreme drought and insect herbivores separately decreased total plant cover. When combined, insect herbivores reduced the impact of drought on total cover by increasing the relative abundance of drought-resistant dominant species. Our results highlight that the negative effect of extreme drought on total plant cover could be alleviated by maintaining robust insect herbivore communities.


中文翻译:

草食动物通过增强优势物种减轻极端干旱对植物群落的负面影响

摘要
目标
极端干旱和昆虫食草动物都可以抑制草原群落的植物生长。然而,大多数研究都孤立地研究了极端干旱和昆虫,有理由相信昆虫可能会改变草原抵御干旱的能力。不幸的是,很少有研究测试草原群落中极端干旱和昆虫食草动物的相互作用。
方法
在这里,我们使用一个操纵性实验测试了干旱与食草动物的相互作用,该实验通过排除内蒙古温带半干旱草原的昆虫食草动物,在极端干旱条件下进行了因子分析。
重要发现
我们的研究结果表明,极端干旱和昆虫食草动物分别降低了植物总覆盖率。当结合起来时,昆虫食草动物通过增加抗旱优势物种的相对丰度来减少干旱对总覆盖的影响。我们的研究结果强调,极端干旱对总植物覆盖的负面影响可以通过维持强大的昆虫食草动物群落来缓解。
更新日期:2021-06-17
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