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Background and aims <p>Increasing anthropogenic nitrogen (N) and phosphorus (P) deposition is intensifying imbalances in global biogeochemical cycles. However, the effects of this deposition on soil carbon (C) and P linkages remain poorly understood due to their complex physical and biochemical interactions.</p> Methods <p>We investigated the concentrations and chemistry (using <sup>13</sup>C solid-state and solution <sup>31</sup>P NMR spectroscopy) of C and P in bulk soil and soil organic C (SOC) fractions (particulate (POM) and mineral-associated organic matter (MAOM)) in a tropical coastal forest after 12&#xa0;years of N and P additions.</p> Results <p>Nutrient additions did not significantly alter SOC concentrations, C fractions, or chemical composition. However, P additions significantly increased soil total and inorganic P, particularly P in POM, but not in MAOM. Crucially, P additions induced divergent responses in soil C and P pools mediated by soil functional carbon fractions. This finding also challenges the prevailing paradigm that P limitation constrains soil C sequestration in highly weathered tropical soils.</p> Conclusions <p>Our results provide insights into how long-term nutrient deposition disrupts soil C-P interactions, with implications for predicting soil C stability in tropical forests. These findings call for context-specific nutrient management in regions experiencing sustained P deposition.</p>

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Divergent chemical responses of soil carbon and phosphorus to nutrient addition mediated by functional carbon pools in tropical forests

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Tengteng Li,
  • Jiaxin Zheng,
  • Yue Li,
  • Zhijian Mou,
  • Jing Zhang,
  • Wenjia Wu,
  • Tao Wang,
  • Faming Wang,
  • Jun Wang,
  • Dafeng Hui,
  • Donghai Wu,
  • Yunfei Yuan,
  • Hans Lambers,
  • Jordi Sardans,
  • Josep Peñuelas,
  • Zhanfeng Liu

摘要

Background and aims

Increasing anthropogenic nitrogen (N) and phosphorus (P) deposition is intensifying imbalances in global biogeochemical cycles. However, the effects of this deposition on soil carbon (C) and P linkages remain poorly understood due to their complex physical and biochemical interactions.

Methods

We investigated the concentrations and chemistry (using 13C solid-state and solution 31P NMR spectroscopy) of C and P in bulk soil and soil organic C (SOC) fractions (particulate (POM) and mineral-associated organic matter (MAOM)) in a tropical coastal forest after 12 years of N and P additions.

Results

Nutrient additions did not significantly alter SOC concentrations, C fractions, or chemical composition. However, P additions significantly increased soil total and inorganic P, particularly P in POM, but not in MAOM. Crucially, P additions induced divergent responses in soil C and P pools mediated by soil functional carbon fractions. This finding also challenges the prevailing paradigm that P limitation constrains soil C sequestration in highly weathered tropical soils.

Conclusions

Our results provide insights into how long-term nutrient deposition disrupts soil C-P interactions, with implications for predicting soil C stability in tropical forests. These findings call for context-specific nutrient management in regions experiencing sustained P deposition.