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Aims <p>Promoting coupled soil carbon and nitrogen accumulation facilitates a virtuous cycle of forest soil carbon sequestration. Mixing pines with AM (arbuscular mycorrhizal) tree species results in higher soil organic carbon (SOC) than with EcM (ectomycorrhizal) species. Yet it is unclear whether both mixed-forest conversions promote carbon and nitrogen co-accumulation, or share the same underlying mechanisms.</p> Methods <p>We obtained 2,869 pairs of data from 98 studies, which included data on SOC, total nitrogen, available nitrogen, and environmental factors, and conducted a comprehensive analysis by linear mixed-effects model.</p> Results <p>Conversion of pure pine forests to forests mixed with AM tree species (PMAM) significantly promoted the coordinated increase of soil organic carbon and available nitrogen in topsoil, with increases of 6.76% and 7.03% respectively. This effect was observed only in topsoil. After the conversion of pure pine forests to forests mixed with EcM tree species (PMEcM), the contents of soil organic carbon and total nitrogen only significantly increased simultaneously in topsoil, increasing by 6.27% and 10.68% respectively. Further analysis revealed that reduced mean annual precipitation correlated with higher soil pH in PMAM and lower soil moisture in PMEcM, facilitating carbon–nitrogen co-accumulation in PMAM topsoil while suppressing it in PMEcM topsoil.</p> Conclusions <p>Due to the higher soil pH and moisture content being conducive to the simultaneous accumulation of carbon and nitrogen in PMAM and PMEcM respectively, we suggest selecting AM tree species with abundant alkaline litter for PMAM, and EcM tree species with large litter input and strong water retention capacity for PMEcM.</p> Graphical Abstract <p></p>

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Mycorrhizal types of mixed tree species mediates soil carbon and nitrogen co-accumulation in mixed pine forests

  • 期刊论文

  • 发表日期：

    2026年7月15日

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  • Yaoxiong Wang,
  • Yunchao Zhou,
  • Fenghua Tang,
  • Jian Feng,
  • Jirong Feng,
  • Yang Peng,
  • Qianbin Cao,
  • Piaoyun Deng,
  • Yunxing Bai

摘要

Aims

Promoting coupled soil carbon and nitrogen accumulation facilitates a virtuous cycle of forest soil carbon sequestration. Mixing pines with AM (arbuscular mycorrhizal) tree species results in higher soil organic carbon (SOC) than with EcM (ectomycorrhizal) species. Yet it is unclear whether both mixed-forest conversions promote carbon and nitrogen co-accumulation, or share the same underlying mechanisms.

Methods

We obtained 2,869 pairs of data from 98 studies, which included data on SOC, total nitrogen, available nitrogen, and environmental factors, and conducted a comprehensive analysis by linear mixed-effects model.

Results

Conversion of pure pine forests to forests mixed with AM tree species (PMAM) significantly promoted the coordinated increase of soil organic carbon and available nitrogen in topsoil, with increases of 6.76% and 7.03% respectively. This effect was observed only in topsoil. After the conversion of pure pine forests to forests mixed with EcM tree species (PMEcM), the contents of soil organic carbon and total nitrogen only significantly increased simultaneously in topsoil, increasing by 6.27% and 10.68% respectively. Further analysis revealed that reduced mean annual precipitation correlated with higher soil pH in PMAM and lower soil moisture in PMEcM, facilitating carbon–nitrogen co-accumulation in PMAM topsoil while suppressing it in PMEcM topsoil.

Conclusions

Due to the higher soil pH and moisture content being conducive to the simultaneous accumulation of carbon and nitrogen in PMAM and PMEcM respectively, we suggest selecting AM tree species with abundant alkaline litter for PMAM, and EcM tree species with large litter input and strong water retention capacity for PMEcM.

Graphical Abstract