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<p>While soil microorganisms mediate important ecosystem functions, their community assembly mechanisms along a spatially connected environmental continuum remain elusive. Here, we profiled the taxonomic and functional characteristics of soil microbiomes across three independent wetland-grassland-bareland continua on the Pamir Plateau. Along this spatial environmental continuum, microbial diversity, network complexity, and network stability decreased significantly towards barelands. Null model analyses revealed a pronounced shift in community assembly within barelands, characterized by increased heterogeneous selection and dispersal limitation. This assembly shift, potentially associated with water limitation and salt stress, may contribute to the diminished diversity and network robustness. Notably, predicted soil microbial functional potential peaked in grasslands, likely reflecting enhanced plant-soil feedbacks. By linking community properties to predicted functionality, we demonstrated that microbial diversity, rather than network complexity, was more strongly associated with variation in predicted soil microbial functional potential. Ultimately, these findings provide a mechanistic understanding of microbial community assembly and functional transition in sensitive alpine ecosystems.</p>

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Community Assembly Mechanisms Facilitate Understanding of Microbial Responses to Habitat Transition along a Spatial Environmental Continuum in Alpine Plateaus

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月29日

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  • Wenrui Wang,
  • Changjiang Huang,
  • Congrui Liu

摘要

While soil microorganisms mediate important ecosystem functions, their community assembly mechanisms along a spatially connected environmental continuum remain elusive. Here, we profiled the taxonomic and functional characteristics of soil microbiomes across three independent wetland-grassland-bareland continua on the Pamir Plateau. Along this spatial environmental continuum, microbial diversity, network complexity, and network stability decreased significantly towards barelands. Null model analyses revealed a pronounced shift in community assembly within barelands, characterized by increased heterogeneous selection and dispersal limitation. This assembly shift, potentially associated with water limitation and salt stress, may contribute to the diminished diversity and network robustness. Notably, predicted soil microbial functional potential peaked in grasslands, likely reflecting enhanced plant-soil feedbacks. By linking community properties to predicted functionality, we demonstrated that microbial diversity, rather than network complexity, was more strongly associated with variation in predicted soil microbial functional potential. Ultimately, these findings provide a mechanistic understanding of microbial community assembly and functional transition in sensitive alpine ecosystems.