Although native species diversity is frequently reported to enhance invasion resistance, within‐species diversity of native plants can also moderate invasions. While the positive diversity–invasion resistance relationship is often attributed to competition, indirect effects mediated through plant–soil feedbacks can also influence the relationship. We manipulated the genotypic diversity of an endemic species, Scirpus mariqueter, and evaluated the effects of abiotic versus biotic feedbacks on the performance of a global invader, Spartina alterniflora. We found that invader performance on live soils decreased non‐additively with genotypic diversity of the native plant that trained the soils, but this reversed when soils were sterilized to eliminate feedbacks through soil biota. The influence of soil biota on the feedback was primarily associated with increased levels of microbial biomass and fungal diversity in soils trained by multiple‐genotype populations. Our findings highlight the importance of plant–soil feedbacks mediating the positive relationship between genotypic diversity and invasion resistance.

中文翻译：

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基因型多样性通过土壤生物反馈增强本土植物的入侵抵抗力

虽然本地物种多样性经常被报道可以增强入侵抵抗力，但本地植物的物种内多样性也可以减轻入侵。虽然积极的多样性与入侵抵抗关系通常归因于竞争，但通过植物-土壤反馈介导的间接效应也会影响这种关系。我们操纵了特有物种的基因型多样性，三棱草，并评估了非生物反馈与生物反馈对全球入侵者表现的影响，互花米草。我们发现，入侵者在活土壤上的表现与训练土壤的本地植物的基因型多样性呈非加性下降，但当对土壤进行消毒以消除通过土壤生物群的反馈时，这种情况会逆转。土壤生物群对反馈的影响主要与多基因型群体训练的土壤中微生物生物量和真菌多样性水平的增加有关。我们的研究结果强调了植物-土壤反馈调节基因型多样性和入侵抵抗力之间正向关系的重要性。