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<p>Forest development is known to increase soil organic carbon (C) storage, yet the understanding of the stability of this accumulated C remains elusive. To address this gap, the study examined how soil C turnover-a key indicator of stability-changes with forest development, by combining a global meta-analysis with two long-term forest chronosequences spanning subtropical and temperate regions. Global data analysis revealed that soil C stability increased with forests development, showing decreasing soil C turnover rates that were primarily driven by increasing fungi: bacteria ratio. Across two long-term forest chronosequences at Changbai Mountain and Dinghu Mountain, soil C turnover declined with forest succession and was positively associated with fungal <i>K/r</i>-strategies, whereas bacterial community attributes exhibited weak relationships. Notably, conventional indicators of physical C protection, such as the mineral-associated to particulate organic C ratio, along with microbial indicators (microbial biomass, extracellular enzyme activities, and respiration rates), explained only a limited proportion of the variation in soil C turnover. These findings highlight that microbial resource-use strategies are more critical predictors of forest soil C stability than traditional physical or microbial indicators.</p>

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Microbial resource-use strategies mediate soil carbon turnover across forest succession

  • 期刊论文

  • 发表日期：

    2026年6月27日

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  • Wenya Du,
  • Shuxian Jia,
  • Miriam Muñoz-Rojas,
  • Yanghui He,
  • Lingyan Zhou,
  • Guiyao Zhou,
  • Kaiyan Zhai,
  • Minhuang Wang,
  • Zhenghu Zhou,
  • Ruiqiang Liu,
  • Pete Smith,
  • Xuhui Zhou

摘要

Forest development is known to increase soil organic carbon (C) storage, yet the understanding of the stability of this accumulated C remains elusive. To address this gap, the study examined how soil C turnover-a key indicator of stability-changes with forest development, by combining a global meta-analysis with two long-term forest chronosequences spanning subtropical and temperate regions. Global data analysis revealed that soil C stability increased with forests development, showing decreasing soil C turnover rates that were primarily driven by increasing fungi: bacteria ratio. Across two long-term forest chronosequences at Changbai Mountain and Dinghu Mountain, soil C turnover declined with forest succession and was positively associated with fungal K/r-strategies, whereas bacterial community attributes exhibited weak relationships. Notably, conventional indicators of physical C protection, such as the mineral-associated to particulate organic C ratio, along with microbial indicators (microbial biomass, extracellular enzyme activities, and respiration rates), explained only a limited proportion of the variation in soil C turnover. These findings highlight that microbial resource-use strategies are more critical predictors of forest soil C stability than traditional physical or microbial indicators.