施氮水平对冬小麦收获品质影响的模拟研究

Accurate estimation of yield and protein is of great significance. Crop models can capture the key physiological process, simulate crop growth and N uptake, and further estimate production, protein yield and grain protein concentration (GPC). However, the existing crop models have simplified the N uptake ability of storage organs (sink process), few models have considered the effects of multiple factors on sink process. In this study, individual grain N accumulation model and SWAP were combined together to construct SWAP-pro model, which have considered the influences of temperature, water availability, nitrogen status, and genotype on sink process. Comparison between SWAP and SWAP-pro showed that SWAP could not accurately simulate the nitrogen stress of winter wheat, had a poor estimation of yield, and significantly underestimated the protein yield; SWAP-pro demonstrated good robustness when simulated leaf area index, leaf nitrogen content and biomass. SWAP-pro had a more stable and accurate simulation of nitrogen stress, performed a better estimation of yield, and had a smaller simulation error of protein yield. This study can help understand the relationship between nitrogen cycle and harvest quality of winter wheat, and provide some reference for estimation of production and protein.