PDF(Pubmed)
Abstract：
Revealing the roles of biotic factors in driving community assembly, which is crucial for the understanding of biodiversity and ecosystem functions, is a fundamental but infrequently investigated subject in microbial ecology. Here, combining a cross-biome observational study with an experimental microcosm study, we provided evidence to reveal the major roles of biotic factors (i.e., soil fungi and cross-kingdom species associations) in determining soil bacterial biogeography and community assembly in complex terrestrial ecosystems of the arid regions of northwest China. The results showed that the soil fungal richness mediates the balance of assembly processes of bacterial communities, and stochastic assembly processes decreased with increasing fungal richness. Our results further suggest that the predicted increase in aridity conditions due to climate change will reduce bacterial α-diversity, particularly in desert soils and subsurface layer, and induce more negative species associations. Together, our study represents a significant advance in linking soil fungi to the mechanisms underlying bacterial biogeographic patterns and community assembly in arid ecosystems under climate aridity and land-use change scenarios.
摘要：
揭示生物因素在推动社区集会中的作用，这对于理解生物多样性和生态系统功能至关重要，是微生物生态学中一个基本但不经常研究的课题。这里,将跨生物群落观察研究与实验性微观世界研究相结合，我们提供了证据来揭示生物因子的主要作用(即，土壤真菌和跨王国物种协会）确定中国西北干旱地区复杂陆地生态系统中的土壤细菌生物地理和群落组装。结果表明,土壤真菌丰富度介导了细菌群落组装过程的平衡,随机装配过程随着真菌丰富度的增加而减少。我们的结果进一步表明，由于气候变化导致的干旱条件的预测增加将减少细菌α-多样性，特别是在沙漠土壤和地下层，并诱导更多的负面物种关联。一起,我们的研究代表了在气候干旱和土地利用变化情景下，将土壤真菌与干旱生态系统中细菌生物地理模式和群落组装的潜在机制联系起来的重大进展。
