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A numerical simulation model is presented in this paper,which comprises the processes ofcrop growth,soil organic carbon decomposition,and methane emissions in agroecosystems.Simulation results show that the model can simulate the main process of methane emissions well,and the correlation coefficient between the simulated values and observed data is 0.79 with 239samples,which passed a significance test of 0.01.The average error of methane emissionsimulation in whole growth period is about 15%.Numerical analysis of the model indicates that theaverage temperature during rice growth period has much impacts on methane emissions,and thebasic trend of interannual methane emissions is similar to that of average temperature.The amountof methane emissions reduces about 34.93%,when the fertilizer is used instead of manure in singlerice paddy.
A numerical simulation model is presented in this paper, which comprises the processes of crop growth, soil organic carbon decomposition, and methane emissions in agroecosystem. Simulation results show that the model can simulate the main process of methane emissions well, and the correlation coefficient between the simulated values and observed data is 0.79 with 239 samples, which passed a significance test of 0.01. The average error of methane emissionsimulation in whole growth period is about 15%. Numerical analysis of the model indicates that the temperature of during rice growth period has much more on methane emissions, and the basic trend of interannual methane emissions is similar to that of average of the amount of methane emissions reduces of about 34.93%, when the fertilizer is used instead of manure in singlerice paddy.