1. Fungal mycelium is increasingly recognized as a central component of soil biogeochemical cycling, yet our current understanding of the ecological controls on fungal necromass decomposition is limited to single sites and vegetation types.
2. By deploying common fungal necromass substrates in a temperate oak savanna and hardwood forest in the midwestern USA, we assessed the generality of the rate at which high‐ and low‐quality fungal necromass decomposes; further, we investigated how the decomposer ‘necrobiome’ varies both across and within sites under vegetation types dominated by either arbuscular or ectomycorrhizal plants.
3. The effects of necromass quality on decay rate were robust to site and vegetation type differences, with high‐quality fungal necromass decomposing, on average, 2.5 times faster during the initial stages of decay. Across vegetation types, bacterial and fungal communities present on decaying necromass differed from bulk soil microbial communities and were influenced by necromass quality. Moulds, yeasts and copiotrophic bacteria consistently dominated the necrobiome of high‐quality fungal substrates.
4. Synthesis. We show that regardless of differences in decay environments, high‐quality fungal substrates decompose faster and support different types of decomposer micro‐organisms when compared with low‐quality fungal tissues. These findings help to refine our theoretical understanding of the dominant factors affecting fast cycling components of soil organic matter and the microbial communities associated with rapid decay.

中文翻译：

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在不同植被类型下，基质质量​​驱动真菌坏死性腐烂和分解者群落结构

1. 真菌菌丝体日益被认为是土壤生物地球化学循环的重要组成部分，但是我们目前对真菌坏死菌分解的生态控制的理解仅限于单个部位和植被类型。
2. 通过在美国中西部的温带橡木大草原和阔叶林中部署常见的真菌坏死基质，我们评估了高品质和低质量真菌坏死分解速率的一般性。此外，我们研究了分解剂“坏死生物组”在丛枝植物或外生菌根植物占主导地位的植被类型下的地点之间和地点之间如何变化。
3. 坏死质量对腐烂率的影响对于部位和植被类型的差异很强，高质量的真菌坏死在腐烂初期平均分解速度要快2.5倍。在各种植被类型中，腐烂坏死微生物中存在的细菌和真菌群落不同于散装土壤微生物群落，并且受到坏死微生物质量的影响。霉菌，酵母和营养缺陷型细菌始终占据着高质量真菌底物的坏死生物组的主导地位。
4. 综合。我们表明，与低质量的真菌组织相比，无论腐烂环境如何变化，高质量的真菌底物都能更快地分解并支持不同类型的分解微生物。这些发现有助于完善我们对影响土壤有机质快速循环组分以及与快速腐烂相关的微生物群落的主要因素的理论理解。