Depth-dependent responses of soil organic carbon under nitrogen deposition
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Emerging evidence points out that the responses of soil organic carbon (SOC) to nitrogen (N) addition differ along the soil profile, highlighting the importance of synthesizing results from different soil layers. Here, using a global meta-analysis, we found that N addition significantly enhanced topsoil (0–30 cm) SOC by 3.7% (±1.4%) in forests and grasslands. In contrast, SOC in the subsoil (30–100 cm) initially increased with N addition but decreased over time. The model selection analysis revealed that experimental duration and vegetation type are among the most important predictors across a wide range of climatic, environmental, and edaphic variables. The contrasting responses of SOC to N addition indicate the importance of considering deep soil layers, particularly for long-term continuous N deposition. Finally, the lack of depth-dependent SOC responses to N addition in experimental and modeling frameworks has likely resulted in the overestimation of changes in SOC storage under enhanced N deposition.
| Originalsprog | Engelsk |
|---|---|
| Artikelnummer | e17247 |
| Tidsskrift | Global Change Biology |
| Vol/bind | 30 |
| Udgave nummer | 3 |
| Antal sider | 13 |
| ISSN | 1354-1013 |
| DOI | |
| Status | Udgivet - 2024 |
Bibliografisk note
Funding Information:
This study is granted by the National Natural Science Foundation of China (42361144886, 32371675), Shaanxi Province Natural Science Foundation for Distinguished Young Scholar (2024JC-JCQN-32), EU H2020 Marie Skłodowska-Curie Actions (no. 839806), Aarhus University Research Foundation (AUFF-E-2019-7-1), Danish Independent Research Foundation (1127-00015B), “Young Top-notch Talent” in Pearl River talent plan of Guangdong Province (2019QN01L763), Nordic Committee of Agriculture and Food Research, and Aarhus University iClimate.
Funding Information:
This study is granted by the National Natural Science Foundation of China (42361144886, 32371675), Shaanxi Province Natural Science Foundation for Distinguished Young Scholar (2024JC‐JCQN‐32), EU H2020 Marie Skłodowska‐Curie Actions (no. 839806), Aarhus University Research Foundation (AUFF‐E‐2019‐7‐1), Danish Independent Research Foundation (1127‐00015B), “Young Top‐notch Talent” in Pearl River talent plan of Guangdong Province (2019QN01L763), Nordic Committee of Agriculture and Food Research, and Aarhus University iClimate.
Publisher Copyright:
© 2024 The Authors. Global Change Biology published by John Wiley & Sons Ltd.
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