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<p><UnorderedList Mark="Bullet"> <ItemContent> <p>C dynamics and microbial traits along a wetland-to-forest gradient were assessed.</p> </ItemContent> <ItemContent> <p>Vascular plant encroachment reduced soil nutrient availability and C pools.</p> </ItemContent> <ItemContent> <p>Microbial diversity and communities shifted along the degradation gradient.</p> </ItemContent> <ItemContent> <p>Soils in the small-tree-dominated area exhibited the lowest microbial diversity.</p> </ItemContent> <ItemContent> <p>Stochasticity had a greater influence on bacterial than fungal community assembly.</p> </ItemContent> </UnorderedList></p><p>Peatlands are critical terrestrial carbon (C) pool, yet their C sequestration capacity is highly susceptible to climate changes. Warming- and drought-driven <i>Sphagnum</i> decline and vascular plant encroachment are expected to accelerate C decomposition and ecosystem transitions. Here, we established a wetland-to-forest successional gradient, including Herb-, Shrub-, Small-tree-, and Tree-dominated areas, to investigate how plant encroachment affected C dynamics and microbial community assembly in a subtropical peatland. Our findings revealed that soil nutrient availability and C contents significantly declined with plant encroachment, favoring microbial taxa adapted to distinct C substrates and oxygen regimes. Microbial diversity was lowest in the ecotone (Small-tree-dominated area), suggesting strong environmental filtering during community reassembly in response to peatland degradation. Microbial community assembly was predominantly governed by deterministic processes, with stochasticity playing a more substantial role in shaping bacterial assemblages than in fungal community. Moreover, bacterial co-occurrence networks became increasingly simplified, while fungal networks grew more complex along the successional gradient, indicating divergent microbial responses to peatland degradation. These findings provide new insights into C and microbial dynamics along a forest successional gradient in subtropical peatlands. The vascular encroachment could serve as an early warning signal of peatland degradation, highlighting the need for proactive conservation strategies.</p>

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Vascular plant encroachment drives soil carbon loss and microbial assembly shifts across a successional gradient in a subtropical Sphagnum-dominated peatland

  • 期刊论文

  • 发表日期：

    2026年2月7日

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  • Meng-Jie Yu,
  • Ting Wang,
  • Jia-Peng Wang,
  • Ze-Dong Lang,
  • Zhi-Yi Zhao,
  • Jing-Yan Hu,
  • Yi-Yue Wang,
  • Yu-Huan Wu

摘要

C dynamics and microbial traits along a wetland-to-forest gradient were assessed.

Vascular plant encroachment reduced soil nutrient availability and C pools.

Microbial diversity and communities shifted along the degradation gradient.

Soils in the small-tree-dominated area exhibited the lowest microbial diversity.

Stochasticity had a greater influence on bacterial than fungal community assembly.

Peatlands are critical terrestrial carbon (C) pool, yet their C sequestration capacity is highly susceptible to climate changes. Warming- and drought-driven Sphagnum decline and vascular plant encroachment are expected to accelerate C decomposition and ecosystem transitions. Here, we established a wetland-to-forest successional gradient, including Herb-, Shrub-, Small-tree-, and Tree-dominated areas, to investigate how plant encroachment affected C dynamics and microbial community assembly in a subtropical peatland. Our findings revealed that soil nutrient availability and C contents significantly declined with plant encroachment, favoring microbial taxa adapted to distinct C substrates and oxygen regimes. Microbial diversity was lowest in the ecotone (Small-tree-dominated area), suggesting strong environmental filtering during community reassembly in response to peatland degradation. Microbial community assembly was predominantly governed by deterministic processes, with stochasticity playing a more substantial role in shaping bacterial assemblages than in fungal community. Moreover, bacterial co-occurrence networks became increasingly simplified, while fungal networks grew more complex along the successional gradient, indicating divergent microbial responses to peatland degradation. These findings provide new insights into C and microbial dynamics along a forest successional gradient in subtropical peatlands. The vascular encroachment could serve as an early warning signal of peatland degradation, highlighting the need for proactive conservation strategies.