Abstract In the last few decades, microbial inoculants have been used as organic fertilizers worldwide. Among the most widely used commercial products are arbuscular mycorrhizal (AM) fungi, as these fungi can associate with a variety of crops. Despite the potential benefits for soil quality and crop yield associated with AM fungal colonization, experiments assessing the persistence of the fungi in the field have yielded inconsistent results. Additionally, it is not yet clear whether or not the introduction of commercial inoculants could lead to changes to the resident fungal community, and eventually to invasion of the commercial products with a possible displacement of resident species. Here we use a partial differential equation model to assess the potential biodiversity risks and productivity benefits deriving from inoculation. We study the impact of AM fungal inoculation on the resident fungal community and on plant growth at a landscape scale. We determine how inoculant persistence and spread are affected by its competition with resident fungal species, by its mutualist quality, and by fungal dispersal. Our findings suggest that the increase in fungal abundance due to inoculation always leads to a short-term increase in host productivity, regardless of inoculant identity. However, the use of strongly competing inoculants constitutes a biodiversity risk, and may result in the invasion of low quality mutualists.

中文翻译：

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调查菌根接种物对常驻真菌群落和植物生长的影响

摘要 近几十年来，微生物菌剂在世界范围内被用作有机肥料。最广泛使用的商业产品是丛枝菌根 (AM) 真菌，因为这些真菌可以与多种作物相关联。尽管 AM 真菌定植对土壤质量和作物产量有潜在的好处，但评估真菌在田间持久性的实验产生了不一致的结果。此外，目前尚不清楚商业接种剂的引入是否会导致常驻真菌群落的变化，并最终导致商业产品入侵，并可能取代常驻物种。在这里，我们使用偏微分方程模型来评估接种带来的潜在生物多样性风险和生产力收益。我们在景观尺度上研究了 AM 真菌接种对常驻真菌群落和植物生长的影响。我们确定接种剂的持久性和传播如何受其与常驻真菌物种的竞争、共生质量和真菌传播的影响。我们的研究结果表明，无论接种剂身份如何，接种引起的真菌丰度的增加总是会导致宿主生产力的短期增加。然而，强竞争接种剂的使用构成了生物多样性风险，并可能导致低质量互惠者的入侵。并通过真菌传播。我们的研究结果表明，无论接种剂身份如何，接种引起的真菌丰度的增加总是会导致宿主生产力的短期增加。然而，强竞争接种剂的使用构成了生物多样性风险，并可能导致低质量互惠者的入侵。并通过真菌传播。我们的研究结果表明，无论接种剂身份如何，接种引起的真菌丰度的增加总是会导致宿主生产力的短期增加。然而，强竞争接种剂的使用构成了生物多样性风险，并可能导致低质量互惠者的入侵。