| The APSIM(Agricultural Production Systems Simulator)model,as a mechanism model capable of simulating the elements of an agricultural production system,is a crop growth model established by the Australian Agricultural Production Systems Group and has many advantages over other models.This paper analyzes the adaptability of the APSIM model in the corn producing areas of Shanxi Province by using the daily weather data related to the six representative sites in Shanxi Province and the relevant observation data of corn fields.After analyzing the relevant data,The results show:The simulated values of the date and yield values of the maize growth period(emergence,flowering and maturity)of the six corn-growing meteorological sites simulated by the APSIM model were in good agreement with the measured values.Among the three stages,from sowing to emergence,sowing to flowering,and sowing to maturity,the root mean square error values are 0--3d,1--8d,and 0--8d,respectively.The measured yields of the selected five corn varieties were less than 30% of the simulated NRMSE.At the same time,the growth period of corn and the simulation results of the above-ground yield and biomass are all within the allowable range.It can be seen that the model has better simulation effects on different varieties of corn,whether it is yield,or above-ground biomass or growth period.After the parameters of the APSIM model were debugged,the localized APSIM model was used to simulate the growth period,yield formation,leaf area index and total biomass of the maize in Shanxi Province.The results showed rainfall,CO?content and minimum temperature.Meteorological factors such as the increase of corn are positively correlated with corn yield.Finally,based on the simulation results,the proposed measures for the development of dry farming in Shanxi and the conservation of water and fertilizer resources were provided,which provided suggestions for fundamentally improving the soil degradation and the low efficiency of agricultural production in the Loess Plateau. |
