State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, College of Soil and Water Conservation Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China; Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling, Shaanxi 712100, China; University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, College of Soil and Water Conservation Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.
J Environ Sci (China). 2025 May;151:88-99. doi: 10.1016/j.jes.2024.03.028. Epub 2024 Mar 22.
Global warming and nitrogen (N) deposition have a profound impact on greenhouse gas (GHG) fluxes and consequently, they also affect climate change. However, the global combined effects of warming and N addition on GHG fluxes remain to be fully understood. To address this knowledge gap, a global meta-analysis of 197 datasets was performed to assess the response of GHG fluxes to warming and N addition and their interactions under various climate and experimental conditions. The results indicate that warming significantly increased CO emissions, while N addition and the combined warming and N addition treatments had no impact on CO emissions. Moreover, both warming and N addition and their interactions exhibited positive effects on NO emissions. Under the combined warming and N addition treatments, warming was observed to exert a positive main effect on CO emissions, while N addition had a positive main effect on NO emissions. The interactive effects of warming and N addition exhibited antagonistic effects on CO, NO, and CH emissions, with CH uptake dominated by additive effects. Furthermore, we identified biome and climate factors as the two treatments. These findings indicate that both warming and N addition substantially impact soil GHG fluxes and highlight the urgent need to investigate the influence of the combination of warming and N addition on terrestrial carbon and N cycling under ongoing global change.
全球变暖与氮（N）沉降对温室气体（GHG）通量有深远影响，从而也影响气候变化。然而，变暖与 N 添加对 GHG 通量的全球综合影响仍有待充分理解。为了解决这一知识空白，我们对 197 组数据集进行了全球元分析，以评估在各种气候和实验条件下，GHG 通量对变暖与 N 添加及其相互作用的响应。结果表明，变暖显著增加了 CO2 的排放，而 N 添加以及变暖与 N 添加的综合处理对 CO2 的排放没有影响。此外，变暖与 N 添加及其相互作用都对 NO 的排放有积极影响。在变暖与 N 添加的综合处理下，变暖对 CO2 的排放有积极的主要影响，而 N 添加对 NO 的排放有积极的主要影响。变暖与 N 添加的相互作用对 CO、NO 和 CH 的排放表现出拮抗作用，而 CH 的吸收主要受加性效应的影响。此外，我们还确定了生物群落和气候因素是两种处理方式。这些发现表明，变暖与 N 添加都对土壤 GHG 通量有重大影响，并强调了在当前全球变化下，急需研究变暖与 N 添加的组合对陆地碳和 N 循环的影响。
