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Background and Aims <p>Forest soil is the largest organic carbon (C) pool in the global terrestrial ecosystem, and soil organic carbon (SOC) pool stability is crucial for maintaining C balance and coping with climate change. However, the dynamic changes of SOC fractions and the driving mechanism of SOC pool stability remain unclear as succession progresses.</p> Methods <p>Using the method of ‘space-for-time substitution’, this study examined four succession stages (early, middle, middle-late, and late) of poplar-birch secondary forests in the Northern Hebei Mountains, investigated dynamic variations in SOC fractions, and determined the key predictors of SOC pool stability.</p> Results <p>Soil total nitrogen (TN), total phosphorus, available nitrogen, available phosphorus, microbial biomass nitrogen (MBN), β-1,4-glucosidase, and β-D-cellobiosidase (CBH) increased greatly as succession progressed, but total potassium (TK) fell markedly. The content of SOC and SOC fractions (easily oxidizable organic C, mineral-associated organic C (MAOC), particulate organic C (POC), microbial biomass C, and dissolved organic C) increased significantly as succession progressed, and MAOC was the main body of the SOC (51.94%-63.75%). The C pool management index (CPMI) also rose dramatically as succession progressed. The partial least squares path model revealed that the increases in TN and MBN content stimulated CBH activity, promoted the accumulation of POC and MAOC, and ultimately significantly increased CPMI. Especially, TN was identified as the key predictor.</p> Conclusion <p>Soil fertility increased, and SOC pool stability improved as succession progressed, which had significant practical value for promoting the coordinated development of regional ecological restoration and C neutrality goals.</p>

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Soil total nitrogen drives the enhancement of carbon pool stability as the succession progresses in poplar-birch secondary forests

  • 期刊论文

  • 发表日期：

    2026年5月24日

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  • Ge Li,
  • Jiahe Zhou,
  • Qiang Liu,
  • Jiaying He,
  • Zhidong Zhang,
  • Yue Pang,
  • Jing Tian,
  • Qi Zhang,
  • Yuexun Wang

摘要

Background and Aims

Forest soil is the largest organic carbon (C) pool in the global terrestrial ecosystem, and soil organic carbon (SOC) pool stability is crucial for maintaining C balance and coping with climate change. However, the dynamic changes of SOC fractions and the driving mechanism of SOC pool stability remain unclear as succession progresses.

Methods

Using the method of ‘space-for-time substitution’, this study examined four succession stages (early, middle, middle-late, and late) of poplar-birch secondary forests in the Northern Hebei Mountains, investigated dynamic variations in SOC fractions, and determined the key predictors of SOC pool stability.

Results

Soil total nitrogen (TN), total phosphorus, available nitrogen, available phosphorus, microbial biomass nitrogen (MBN), β-1,4-glucosidase, and β-D-cellobiosidase (CBH) increased greatly as succession progressed, but total potassium (TK) fell markedly. The content of SOC and SOC fractions (easily oxidizable organic C, mineral-associated organic C (MAOC), particulate organic C (POC), microbial biomass C, and dissolved organic C) increased significantly as succession progressed, and MAOC was the main body of the SOC (51.94%-63.75%). The C pool management index (CPMI) also rose dramatically as succession progressed. The partial least squares path model revealed that the increases in TN and MBN content stimulated CBH activity, promoted the accumulation of POC and MAOC, and ultimately significantly increased CPMI. Especially, TN was identified as the key predictor.

Conclusion

Soil fertility increased, and SOC pool stability improved as succession progressed, which had significant practical value for promoting the coordinated development of regional ecological restoration and C neutrality goals.