Diverse native plant communities resist non‐native plants more than species‐poor communities, in part through resource competition. The role of soil biota in diversity–invasibility relationships is poorly understood, although non‐native plants interact with soil biota during invasions. We tested the responses of non‐native plants to soil biota generated by different native plant diversities. We applied well‐watered and drought treatments in both conditioning and response phases to explore the effects of ‘historical’ and ‘contemporary’ environmental stresses. When generated in well‐watered soils, the microbial legacies from higher native diversity inhibited non‐native growth in well‐watered conditions. In contrast, when generated in drought‐treated soils, the microbial legacies from higher native diversity facilitated non‐native growth in well‐watered conditions. Contemporary drought eliminated microbial legacy effects on non‐native growth. We provide a new understanding of mechanisms behind diversity–invasibility relationships and demonstrate that temporal variation in environmental stress shapes relationships among native plant diversity, soil biota and non‐native plants.

中文翻译：

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本地植物多样性产生的微生物遗产，根据干旱历史，促进或抑制非本地植物


多样化的本土植物群落比物种贫乏的群落更能抵抗非本土植物，部分原因是资源竞争。尽管非本地植物在入侵期间与土壤生物群相互作用，但对土壤生物群在多样性与入侵关系中的作用知之甚少。我们测试了非本地植物对不同本地植物多样性产生的土壤生物群的反应。我们在调节和响应阶段都采用了充分浇水和干旱处理，以探索“历史”和“当代”环境压力的影响。当在水分充足的土壤中产生时，较高的本地多样性留下的微生物会抑制水分充足条件下的非本地生长。相比之下，当在干旱处理的土壤中产生时，来自较高本地多样性的微生物遗产促进了非本地在水分充足的条件下的生长。当代干旱消除了微生物对非本地生长的遗留影响。我们对多样性-入侵关系背后的机制提供了新的理解，并证明环境胁迫的时间变化塑造了本土植物多样性、土壤生物群和非本土植物之间的关系。