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Background and aims <p>Nutrient availability affects soil microbial activity, thereby regulating soil carbon (C) formation, turnover and storage. Anthropogenic nitrogen (N) and phosphorus (P) inputs are altering soil nutrients, but their consequences for soil organic carbon (SOC) and its components in P-limited tropical forests are poorly understood.</p> Methods <p>We conducted a 13-year-long nutrient addition experiment in two tropical montane forests to investigate the effects of N and P additions on soil particulate organic carbon (POC) and mineral-associated organic carbon (MAOC).</p> Results <p>Long-term high-N addition increased soil POC concentration and its contribution to SOC through altering edaphic conditions (i.e., soil acidification and nutrient imbalance) and suppressing microbial biomass C together with activity of lignin-modifying enzymes. However, P addition had minor effects on POC pool, which was mainly attributed to alleviate P limitation and stimulate microbial decomposition. In addition, N and P additions did not significantly change soil MAOC in both forests.</p> Conclusion <p>Our results indicated that soil microorganisms play key roles in regulating soil C cycling through extracellular enzymes under N and P additions, suggesting a necessity of incorporating it into the prediction of ecosystem C dynamics under global change.</p>

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Effects of nitrogen and phosphorus additions on soil particulate organic carbon through altering microbial decomposition in two tropical montane rainforests

  • 期刊论文

  • 发表日期：

    2025年5月13日

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  • Kai Dong,
  • Zixin Chen,
  • Suhui Ma,
  • Xuemei Yang,
  • Wenao Wu,
  • Danhua Zhang,
  • Chen Yang,
  • Fan Fan,
  • Jiangling Zhu,
  • Chengjun Ji,
  • Jingyun Fang

摘要

Background and aims

Nutrient availability affects soil microbial activity, thereby regulating soil carbon (C) formation, turnover and storage. Anthropogenic nitrogen (N) and phosphorus (P) inputs are altering soil nutrients, but their consequences for soil organic carbon (SOC) and its components in P-limited tropical forests are poorly understood.

Methods

We conducted a 13-year-long nutrient addition experiment in two tropical montane forests to investigate the effects of N and P additions on soil particulate organic carbon (POC) and mineral-associated organic carbon (MAOC).

Results

Long-term high-N addition increased soil POC concentration and its contribution to SOC through altering edaphic conditions (i.e., soil acidification and nutrient imbalance) and suppressing microbial biomass C together with activity of lignin-modifying enzymes. However, P addition had minor effects on POC pool, which was mainly attributed to alleviate P limitation and stimulate microbial decomposition. In addition, N and P additions did not significantly change soil MAOC in both forests.

Conclusion

Our results indicated that soil microorganisms play key roles in regulating soil C cycling through extracellular enzymes under N and P additions, suggesting a necessity of incorporating it into the prediction of ecosystem C dynamics under global change.