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Depth-dependent responses of soil organic carbon under nitrogen deposition.

Authors :
Hu Y
Deng Q
Kätterer T
Olesen JE
Ying SC
Ochoa-Hueso R
Mueller CW
Weintraub MN
Chen J
Source :
Global change biology [Glob Chang Biol] 2024 Mar; Vol. 30 (3), pp. e17247.
Publication Year :
2024

Abstract

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.<br /> (© 2024 The Authors. Global Change Biology published by John Wiley & Sons Ltd.)

Details

Language :
English
ISSN :
1365-2486
Volume :
30
Issue :
3
Database :
MEDLINE
Journal :
Global change biology
Publication Type :
Academic Journal
Accession number :
38491798
Full Text :
https://doi.org/10.1111/gcb.17247