Understanding microbial network assembly is a promising way to predict potential impacts of environmental changes on ecosystem functions. Yet, soil microbial network assembly in mountain ecosystems and its underlying mechanisms remain elusive. Here, we characterized soil microbial co-occurrence networks across twelve altitudinal sites in Mountain Gongga. Despite differences in habitats, soil bacterial networks separated into two different clusters by altitude, namely the lower and higher altitudes, while fungi did not show such a pattern. Bacterial networks encompassed more complex and closer relationships at the lower altitudes, while fungi had closer relationships at the higher altitudes, which could be attributed to niche differentiation caused by high variations in soil environments and plant communities. Both abiotic and biotic factors (e.g. soil pH and bacterial community composition) shaped bacterial networks. However, biotic factors played more important roles than the measured abiotic factors for fungal network assembly. Further analyses suggest that multiple mechanisms including niche overlap/differentiation, cross-feeding and competition between microorganisms could play important roles in shaping soil microbial networks. This study reveals microbial co-occurrence networks in response to different ecological factors, which provides important insights into our comprehensive understanding of microbial network assembly and their functional potentials in mountain ecosystems.

中文翻译：

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不同的机制塑造了山区生态系统中的土壤细菌和真菌共生网络。

了解微生物网络的组装是预测环境变化对生态系统功能的潜在影响的有前途的方法。然而，山区生态系统中的土壤微生物网络组装及其潜在机制仍然难以捉摸。在这里，我们描述了贡嘎山十二个海拔站点的土壤微生物共生网络。尽管栖息地有所不同，但土壤细菌网络按海拔高度（低海拔和高海拔）分为两个不同的簇，而真菌并未显示出这种格局。细菌网络在较低海拔高度包含更复杂和更紧密的关系，而真菌在较高海拔高度具有更紧密的关系，这可能归因于土壤环境和植物群落的高度变异所引起的生态位分化。非生物和生物因素（例如 土壤pH和细菌群落组成）形成细菌网络。但是，对于真菌网络组装而言，生物因子比测得的非生物因子起着更重要的作用。进一步的分析表明，多种机制包括生态位重叠/分化，交叉进料和微生物之间的竞争可能在塑造土壤微生物网络中发挥重要作用。这项研究揭示了应对不同生态因素的微生物共生网络，这为我们对微生物网络组装及其在山区生态系统中的功能潜力的全面理解提供了重要见解。进一步的分析表明，多种机制包括生态位重叠/分化，交叉进料和微生物之间的竞争可能在塑造土壤微生物网络中发挥重要作用。这项研究揭示了应对不同生态因素的微生物共生网络，这为我们对微生物网络组装及其在山区生态系统中的功能潜力的全面理解提供了重要见解。进一步的分析表明，多种机制包括生态位重叠/分化，交叉进料和微生物之间的竞争可能在塑造土壤微生物网络中发挥重要作用。这项研究揭示了响应不同生态因素的微生物共生网络，这为我们对微生物网络组装及其在山区生态系统中的功能潜力的全面理解提供了重要见解。