Preliminary Approach on Adaptability of ORYZA2000 Model for Aerobic Rice in Beijing Region

The ORYZA2000 model for aerobic rice was tested and verified via field experiments conducted at the Changping Experiment Station (40˚02’ N, 116˚10’E; elevation of 43 m) of the China Agricultural University in Beijing, in 2002 and 2003. From aerobic field results in 2003, the developmental rates of aerobic rice in different stages, partitioning factors of dry matter, specific leaf areas and maxinmum root depth were obtained. The biomass, LAI and yield were verified using the experimental data in 2002. The slope(β), intercept(α),and determination coefficient(R2) of the linear regression between simulated and measured values as well as the student's t-test assuming unequal variance and the normalized root mean square error(NRMSE) were used for the evaluation of ORYZ2000 model's effective.The results showed that ORYZA2000 model was acceptable in simulations of biomasses and LAI. In general, the simulations for total biomass and panicle biomass were more accurate than that for green leave biomass and stem biomass. NRMSE of total biomass, green leave biomass, stem biomass and panicle biomass were 45%,35%,57%and 37%, respectively(Table 1). The simulations of yield were lower than the messured ones with NRMSE of 23% and LAI's simulations were with NRMSE of 35%(Table2).