Global sensitivity analysis of N2O emission of APSIM model based on EFAST method
To quantitatively discuss the impact of various parameters in the APSIM model on N2O gas emis-sions from dryland wheat fields,the spring wheat variety'Dingxi 35'from 2019 to 2021 was selected as the re-search object.The Extended Fourier Amplitude Sensitivity Test method was used to analyze the sensitivity of various parameters affecting the model output of spring wheat,focusing on the influence of model inputs on crop variety pa-rameters,meteorological parameters,soil parameters,and management parameters on the model output.The results indicated that the most sensitive crop variety parameter affecting the N2O gas emission index of spring wheat was the accumulated temperature from emergence to jointing stage,followed by the accumulated temperature at the initial flowering stage,the accumulated temperature at the filling stage,vernalization sensitivity index,potential filling rate,and photoperiod sensitivity index.Among meteorological parameters,the most sensitive to the N2O gas emis-sion index is the daily maximum temperature,followed by rainfall and daily minimum temperature.For soil parame-ters,the most sensitive to the N2 O gas emission index was the field capacity,followed by soil bulk density,wheat wilting coefficient,and wheat water absorption coefficient.Among management parameters,the most sensitive to the N2O gas emission index was the amount of fertilizer applied.The EFAST method can quickly screen sensitive pa-rameters of the model and simplify the parameter calibration process.
spring wheatEFAST methodAPSIM modelN2O emissionsensitive analysis
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