The increase in nitrogen (N) deposition may affect nitrous oxide (N₂O) emission in boreal peatlands by increasing N availability and/or altering vegetation composition. However, the effects of changes in vegetation composition (due to the increase in N deposition) on N₂O emission are still unknown. Therefore, we used a factorial design, comprising the removal of plant functional groups and N fertilization to investigate their independent effects and combined effects on N₂O fluxes at an ombrotrophic blanket bog in Western Newfoundland, Canada. The results reveal that N₂O emission significantly increased with N fertilization. Notably, the effect of N addition on N₂O fluxes was modulated by the removal of graminoids. In particular, the removal of graminoids reduced 69% of the N₂O emission increases due to N fertilization in the third year of the experiment. This result suggests that the enhancement of graminoid abundance due to increases in N deposition/fertilization may dramatically increase N₂O emissions in boreal peatlands leading to stronger impacts on the global climate and stratospheric ozone depletion in the future if no countermeasures to reduce reactive N emission are undertaken.

氮（N）沉积的增加可能会通过增加氮素的利用和/或改变植被组成而影响北方泥炭地中的一氧化二氮（N ₂ O）排放。但是，植被组成变化（由于氮沉积增加）对N ₂ O排放的影响仍然未知。因此，我们采用了析因设计，包括去除植物功能基团和​​施氮，以研究它们在加拿大纽芬兰西部的全营养营养毯沼泽中对N ₂ O通量的独立影响和综合影响。结果表明，随着施氮量的增加，N ₂ O的排放量显着增加。值得注意的是，添加氮对N _2的影响通过去除类人动物来调节O通量。特别是，在实验的第三年，去除了类固醇减少了因施氮而导致的N ₂ O排放增加量的69％。这一结果表明，由于氮沉积/施肥的增加而引起的类动物体丰度的提高可能极大地增加了北方泥炭地的N ₂ O排放量，如果未来没有减少活性氮排放的对策，则会对全球气候和平流层臭氧消耗产生更大的影响。进行。