Soil GHG fluxes are altered by N deposition: New data indicate lower N stimulation of the N2O flux and greater stimulation of the calculated C pools
Soil GHG fluxes are altered by N deposition: New data indicate lower N stimulation of the N2O flux and greater stimulation of the calculated C pools
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DOI：
10.1111/gcb.14970
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发表时间：
2020-01-28
影响因子：
11.6
通讯作者：
Peng, Changhui
中科院分区：
文献类型：
--
作者：
Deng, Lei;Huang, Chunbo;Peng, Changhui
氮沉降对陆地生态系统土壤有机碳和温室气体排放的影响是全球气候变化下影响温室气体收支的主要驱动因素。尽管在这方面已经进行了许多研究，我们仍然很少了解如何氮沉降影响土壤碳库和温室气体收支在全球范围内。我们综合了来自全球多个陆地生态系统的275个站点的综合数据集，并量化了全球土壤C库和温室气体通量的响应。结果表明，增施氮肥后，土壤有机碳含量平均增加3.7%，土壤CO2、CH 4和N2 O排放量平均增加0.3%、24.3%和91.3%，土壤CH 4吸收量平均减少6.0%。此外，N2 O排放量的增加百分比（91.3%）比Liu和Greaver报告的（215%）低两倍（Ecology Letters，2009，12：1103-1117）。土壤碳库的刺激作用（每千克氮公顷每年15.70千克碳公顷）也比以前报道的全球氮沉降更大。全球氮沉降结果表明，农田是最大的温室气体排放源（以CO2当量计算），其次是湿地。然而，森林和草原是两个重要的温室气体汇。在全球范围内，氮沉降增加陆地土壤碳汇6.34 Pg CO2/年。它还使土壤温室气体净排放量增加了10.20 Pg CO2-Geq（CO2当量）/年。因此，氮沉降不仅增加了土壤碳库的大小，但也增加了全球温室气体排放量，计算的全球变暖潜能值的方法。
The effects of nitrogen (N) deposition on soil organic carbon (C) and greenhouse gas (GHG) emissions in terrestrial ecosystems are the main drivers affecting GHG budgets under global climate change. Although many studies have been conducted on this topic, we still have little understanding of how N deposition affects soil C pools and GHG budgets at the global scale. We synthesized a comprehensive dataset of 275 sites from multiple terrestrial ecosystems around the world and quantified the responses of the global soil C pool and GHG fluxes induced by N enrichment. The results showed that the soil organic C concentration and the soil CO2, CH4 and N2O emissions increased by an average of 3.7%, 0.3%, 24.3% and 91.3% under N enrichment, respectively, and that the soil CH4 uptake decreased by 6.0%. Furthermore, the percentage increase in N2O emissions (91.3%) was two times lower than that (215%) reported by Liu and Greaver (Ecology Letters, 2009, 12:1103-1117). There was also greater stimulation of soil C pools (15.70 kg C ha(-1) year(-1) per kg N ha(-1) year(-1)) than previously reported under N deposition globally. The global N deposition results showed that croplands were the largest GHG sources (calculated as CO2 equivalents), followed by wetlands. However, forests and grasslands were two important GHG sinks. Globally, N deposition increased the terrestrial soil C sink by 6.34 Pg CO2/year. It also increased net soil GHG emissions by 10.20 Pg CO2-Geq (CO2 equivalents)/year. Therefore, N deposition not only increased the size of the soil C pool but also increased global GHG emissions, as calculated by the global warming potential approach.