We developed simple models, which were termed SG models, for soil CO
2 efflux, CH
4 uptake, and N
2O efflux in forest soils (Hashimoto et al. 2011, Ecological Modelling). Here we report the modeling of N
2O efflux. We described the gas flux in terms of three functions: soil physiochemical property (C/N ratio for N
2O), water-filled pore space (WFPS, 5-cm depth), and soil temperature (5-cm depth). We used Bayesian calibration for optimization of the model. Then we estimated climate-driven changes in N
2O emission fluxes in Japanese forests from 1980 to 2009 using the models (Hashimoto et al. 2011, Scientific Reports). Our study reveals that the N
2O flux in Japanese forests has been increasing over the past 30 years at the rate of 0.0052 Gg N yr
−2 for N
2O (0.27 % yr
−1).
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