Changes in Soil Particulate and Mineral-Associated Organic Carbon Contents Under Nitrogen Addition

Peng, Qi; Chen, Ji; Wang, Xiaojiao; Zhang, Renzhi; Cai, Liqun; Jiao, Ya peng; Li, Zhiqiang; Han, Guo jun

doi:10.2139/ssrn.4229654

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References 42 publications

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“…Besides, in the long term, the alleviated microbial N limitation with N addition is generally associated with decreased oxidase activities and increased formation of stable SOC in the topsoil (Chen et al, 2018;, thereby reducing the C leaching along the soil profile (Kaiser & Kalbitz, 2012). This explanation is supported by both increased particulate and mineral-associated organic carbon in the topsoil only observed in long-term N addition studies (Figure S5; Qi et al, 2023). Similarly, bioturbation contributes to mixing SOC from the topsoil to the subsoil (Wilkinson et al, 2009), whereas this process may be repressed in the later stage of N addition due to possible soil acidification or toxicity effects on soil organisms (Jansone et al, 2020).…”

Section: Long-term N Addition Decreased Subsoil Organic Carbonmentioning

confidence: 81%

Depth‐dependent responses of soil organic carbon under nitrogen deposition

Hu,

Deng,

Kätterer

et al. 2024

Global Change Biology

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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.

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