| Applicability analysis of CERES-Maize model in different agro-ecological zone of Henan |
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| DOI：10.7606/j.issn.1000-7601.2017.02.01 |
| Key Words: CERES-Maize crop model calibration and validation summer maize |
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| Abstract: |
| The main production region of summer maize in Henan Province was divided into four agro-ecological zones. The genetic parameters of representative maize varieties in each zone were determined to calibrate and validate CERES-Maize model by using data from 18 agro-meteorological stations in recently ten years. The data from 2003 to 2005 were used for calibration and from 2006 to 2010 for validation. According to the mean values of calibration and validation in different zones, four sets of zonal variety parameters for modeling were gotten. From the genetic parameters of maize in different zones, it was found that the accumulated temperature in zone I was the largest, followed by zone Ⅲ and Ⅳ; the potential maximum number of kernels per ear was the largest in zone I, followed by zone Ⅲ, and it was the lowest in zone Ⅳ; the kernel filling rate was relatively low in zone Ⅲ, and it was similar in other zones. The calibration and validation results of biomass and yield in different zones showed that the normalized root mean square error (NRMSE) was lower than 20%. The ability of CERES-Maize model was strong in simulating biomass and yield in different zones, but there were some spatial differences in simulating effect. The observed value was close to the simulated value in calibration period of biomass, but it was generally greater than the simulated value in validation period, especially for zone I and Ⅱ. In validation period of yield, the simulated value was lower than the observed value in zone I and Ⅱ，but greater in zone Ⅲ and Ⅳ. The correlation coefficients between observed value and simulated value of biomass and yield in zone Ⅰ to Ⅲ wholly passed the significance test, so the simulating effect of biomass and yield was good in these zones. According to the calibration and validation results of biomass and leaf area index, it was found that the simulating effect of above-ground biomass was good. The observed value of leaf area index slightly lagged behind the simulated value, but their overall trend coincided quite well. |
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