• Despite the ecological significance of ericoid mycorrhizal fungi, little is known about the abiotic and biotic factors driving their diversity and community composition.
• To determine the relative importance of abiotic and biotic filtering in structuring ericoid mycorrhizal fungal communities, we established 156 sampling plots in two highly contrasting environments but dominated by the same Ericaceae plant species: waterlogged bogs and dry heathlands. Plots were located across 25 bogs and 27 dry heathlands in seven European countries covering a gradient in nitrogen deposition and phosphorus availability. Putatively ericoid mycorrhizal fungal communities in the roots of 10 different Ericaceae species were characterized using high‐throughput amplicon sequencing.
• Variation in ericoid mycorrhizal fungal communities was attributed to both habitat and soil variables on the one hand and host plant identity on the other. Communities differed significantly between bogs and heathlands and, in a given habitat, communities differed significantly among host plant species. Fungal richness was negatively related to nitrogen deposition in bogs and phosphorus availability in bogs and heathlands.
• Our results demonstrate that both abiotic and biotic filtering shapes ericoid mycorrhizal fungal communities and advocate an environmental policy minimizing excess nutrient input in these nutrient‐poor ecosystems to avoid loss of ericoid mycorrhizal fungal taxa.

中文翻译：

---

欧洲沼泽和荒地中类固氮菌根真菌的多样性和群落结构跨氮沉积梯度。

• 尽管类固醇菌根真菌具有生态学意义，但对于驱动其多样性和群落组成的非生物和生物因素知之甚少。
• 为了确定非生物和生物过滤在构造类固醇菌根真菌群落中的相对重要性，我们在两个高度相反的环境中建立了156个采样区，但以相同的Ericaceae植物物种为主导：沼泽和沼泽地。分布在七个欧洲国家的25个沼泽和27个干旱荒地上的地块覆盖了氮沉降和磷的可利用量的梯度。使用高通量扩增子测序来表征10种不同埃里科科植物根中的类固醇菌根真菌真菌群落。
• 类固醇菌根真菌群落的变化一方面归因于生境和土壤变量，另一方面归因于寄主植物的特性。沼泽和荒地之间的群落显着不同，在给定的栖息地中，寄主植物物种之间的群落也显着不同。真菌的丰富度与沼泽中的氮沉积以及沼泽和荒地中的磷可利用性负相关。
• 我们的结果表明，非生物和生物过滤均能塑造类固醇菌根真菌群落，并倡导一项环境政策，以尽量减少这些营养贫乏的生态系统中过多的养分输入，以避免类固醇菌根真菌的分类。