17:15 〜 18:45
[BCG04-P04] Meta-analysis of the effects of nitrogen additions on CH4 oxidation in forest soils
Enhanced nitrogen (N) levels are known to have a significant impact on methane (CH4) fluxes in forest soil. While extensive research has been conducted on CH4 oxidation in forest ecosystems in response to N additions, there remains a gap in our understanding of the effects at multiple scales and with different types of nitrogen fertilizers used.
In this study, we conducted a comprehensive meta-analysis to elucidate the effects of N additions on CH4 oxidation in forest soils. We analyzed field observation data from over a hundred N addition trials spanning various forest biomes and nitrogen fertilizer types. Our analysis encompassed evaluations of the impacts of NH4+, NO3-, NH4NO3, and urea additions across boreal, temperate, subtropical, and tropical biomes.
The results revealed that nitrogen addition reduced methane oxidation in forest soils, its impact increasing with nitrogen fertilization level. Meanwhile, individual fertilizer types had similar effects on CH4 oxidation rates, but the combination of ammonium and nitrate had a synergistic effect, lowering CH4 oxidation even more than others. This suggests complex mechanisms governing the interactions between inorganic N and methane oxidation.
This study underscores the intricate interplay between the N and carbon cycles on a global scale, emphasizing the imperative examination of the potential impact of nitrogen on global methane (CH4) fluxes. Furthermore, it highlights the significance of additional research to elucidate the underlying mechanisms governing these interactions.
In this study, we conducted a comprehensive meta-analysis to elucidate the effects of N additions on CH4 oxidation in forest soils. We analyzed field observation data from over a hundred N addition trials spanning various forest biomes and nitrogen fertilizer types. Our analysis encompassed evaluations of the impacts of NH4+, NO3-, NH4NO3, and urea additions across boreal, temperate, subtropical, and tropical biomes.
The results revealed that nitrogen addition reduced methane oxidation in forest soils, its impact increasing with nitrogen fertilization level. Meanwhile, individual fertilizer types had similar effects on CH4 oxidation rates, but the combination of ammonium and nitrate had a synergistic effect, lowering CH4 oxidation even more than others. This suggests complex mechanisms governing the interactions between inorganic N and methane oxidation.
This study underscores the intricate interplay between the N and carbon cycles on a global scale, emphasizing the imperative examination of the potential impact of nitrogen on global methane (CH4) fluxes. Furthermore, it highlights the significance of additional research to elucidate the underlying mechanisms governing these interactions.