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Aims <p>This study investigates the changes in microbial community (bacteria, fungi, and algae) and DOM during ecosystem primary succession in glacier forefield. The core scientific question is how shifting plant and microbial assemblies differentially contribute to DOM molecular recalcitrance and stability across a successional gradient?</p> Methods <p>Using a space-for-time substitution at the Kuoqionggangri Glacier forefield (Tibetan Plateau), we sampled surface soils (0–10&#xa0;cm) from barren ground, herb steppe, and legume steppe stages. Microbial communities were profiled via 16S, 18S rRNA gene, and ITS amplicon sequencing, while DOM composition was characterized using Fourier transform ion cyclotron resonance mass spectrometry. We employed co-occurrence network analysis to identify specific microbe-DOM associations and molecular mass shift analysis to quantify biochemical transformations and estimate microbial contributions to recalcitrant DOM accumulation.</p> Results <p>Plant colonization increased bacterial, fungal, and algal diversity, whereas subsequent plant succession-induced changes were taxonomically restricted in bacteria and fungi but triggered a systemic turnover of the algal community. We found that specialists, including Chloroflexi, Cyanobacteria, and Actinobacteriota, were primarily associated with recalcitrant DOM, whereas generalists (Bacteroidota, Planctomycetota, fungi, and algae) interacted with a diverse range of DOM types. Additionally, the drivers of DOM recalcitrance shifted over succession. Plant-derived inputs determined recalcitrance during initial colonization, whereas microbial reprocessing became the dominant driver during subsequent ecosystem development.</p> Conclusion <p>This study demonstrates that DOM stability is governed by a successional transition from plant-mediated inputs to taxon-specific microbial transformations. These findings provide a mechanistic framework for understanding organic carbon dynamics in rapidly evolving proglacial landscapes.</p>

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The interplay of plants and microbial communities in modulating dissolved organic matter dynamics in a Tibetan glacier forefield

  • 期刊论文

  • 发表日期：

    2026年1月29日

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  • Yang Liu,
  • Saifei Li,
  • Pengfei Liu,
  • Quan Shi,
  • Chen He,
  • Mukan Ji

摘要

Aims

This study investigates the changes in microbial community (bacteria, fungi, and algae) and DOM during ecosystem primary succession in glacier forefield. The core scientific question is how shifting plant and microbial assemblies differentially contribute to DOM molecular recalcitrance and stability across a successional gradient?

Methods

Using a space-for-time substitution at the Kuoqionggangri Glacier forefield (Tibetan Plateau), we sampled surface soils (0–10 cm) from barren ground, herb steppe, and legume steppe stages. Microbial communities were profiled via 16S, 18S rRNA gene, and ITS amplicon sequencing, while DOM composition was characterized using Fourier transform ion cyclotron resonance mass spectrometry. We employed co-occurrence network analysis to identify specific microbe-DOM associations and molecular mass shift analysis to quantify biochemical transformations and estimate microbial contributions to recalcitrant DOM accumulation.

Results

Plant colonization increased bacterial, fungal, and algal diversity, whereas subsequent plant succession-induced changes were taxonomically restricted in bacteria and fungi but triggered a systemic turnover of the algal community. We found that specialists, including Chloroflexi, Cyanobacteria, and Actinobacteriota, were primarily associated with recalcitrant DOM, whereas generalists (Bacteroidota, Planctomycetota, fungi, and algae) interacted with a diverse range of DOM types. Additionally, the drivers of DOM recalcitrance shifted over succession. Plant-derived inputs determined recalcitrance during initial colonization, whereas microbial reprocessing became the dominant driver during subsequent ecosystem development.

Conclusion

This study demonstrates that DOM stability is governed by a successional transition from plant-mediated inputs to taxon-specific microbial transformations. These findings provide a mechanistic framework for understanding organic carbon dynamics in rapidly evolving proglacial landscapes.