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<p>The positive effect of plant diversity on soil carbon (C) stocks is well documented, yet its role in shaping persistent C components essential for long-term soil C stability remains unclear. Using a 3,000-km transect survey of natural grasslands, we found that both bacterial and fungal necromass C increased with plant species richness, with more pronounced effects in the topsoil than in the subsoil and a steeper increase in fungal-derived necromass. Plant C inputs emerged as the primary driver of this response, exerting a stronger influence than soil nitrogen, pH, microbial attributes or mineral properties. These findings indicate that plant diversity promotes persistent soil C accumulation primarily through substrate supply that enhances microbial residue production. Our study underscores the importance of maintaining and restoring plant diversity in grasslands as a nature-based strategy to enhance stable soil C storage, thereby facilitating soil C sink capacity and contributing to climate change mitigation.</p>

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Plant diversity is key for microbial necromass carbon accrual in alpine grasslands

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月30日

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  • Yingjie Yan,
  • Yann Hautier,
  • Xinli Chen,
  • Jiaqiang Liao,
  • Junxiao Pan,
  • Yang Li,
  • Ruiyang Zhang,
  • Dashuan Tian,
  • Chen Chen,
  • Jinsong Wang,
  • Shuli Niu

摘要

The positive effect of plant diversity on soil carbon (C) stocks is well documented, yet its role in shaping persistent C components essential for long-term soil C stability remains unclear. Using a 3,000-km transect survey of natural grasslands, we found that both bacterial and fungal necromass C increased with plant species richness, with more pronounced effects in the topsoil than in the subsoil and a steeper increase in fungal-derived necromass. Plant C inputs emerged as the primary driver of this response, exerting a stronger influence than soil nitrogen, pH, microbial attributes or mineral properties. These findings indicate that plant diversity promotes persistent soil C accumulation primarily through substrate supply that enhances microbial residue production. Our study underscores the importance of maintaining and restoring plant diversity in grasslands as a nature-based strategy to enhance stable soil C storage, thereby facilitating soil C sink capacity and contributing to climate change mitigation.