PDF(Pubmed)
Abstract：
Soil salinization poses a global threat to terrestrial ecosystems. Soil microorganisms, crucial for maintaining ecosystem services, are sensitive to changes in soil structure and properties, particularly salinity. In this study, contrasting dynamics within the rhizosphere and bulk soil were focused on exploring the effects of heightened salinity on soil microbial communities, evaluating the influences shaping their composition in saline environments. This study observed a general decrease in bacterial alpha diversity with increasing salinity, along with shifts in community structure in terms of taxa relative abundance. The size and stability of bacterial co-occurrence networks declined under salt stress, indicating functional and resilience losses. An increased proportion of heterogeneous selection in bacterial community assembly suggested salinity\'s critical role in shaping bacterial communities. Stochasticity dominated fungal community assembly, suggesting their relatively lower sensitivity to soil salinity. However, bipartite network analysis revealed that fungi played a more significant role than bacteria in intensified microbial interactions in the rhizosphere under salinity stress compared to the bulk soil. Therefore, microbial cross-domain interactions might play a key role in bacterial resilience under salt stress in the rhizosphere.
摘要：
土壤盐渍化对陆地生态系统构成全球性威胁。土壤微生物,对于维持生态系统服务至关重要，对土壤结构和性质的变化敏感，特别是盐度。在这项研究中,根际和块状土壤的对比动态集中在探索盐分升高对土壤微生物群落的影响上，评估在盐水环境中塑造其成分的影响。这项研究观察到细菌α多样性随着盐度的增加而普遍下降，随着群落结构在分类群相对丰度方面的变化。盐胁迫下细菌共生网络的大小和稳定性下降，表明功能和弹性损失。细菌群落组装中异质选择比例的增加表明盐度在形成细菌群落中的关键作用。随机支配真菌群落组装，表明它们对土壤盐分的敏感性相对较低。然而,双向网络分析显示，与散装土壤相比，在盐分胁迫下，真菌在根际增强的微生物相互作用中起着比细菌更重要的作用。因此,微生物跨域相互作用可能在根际盐胁迫下的细菌恢复力中起关键作用。
