中文摘要：

为探究不同积温计算方法对作物发育期模拟效果的影响情况,以北京密云冬小麦1989—2011年返青-拔节、拔节-抽穗和抽穗-成熟期为例,统计了基于3种线性假设的京冬8号和不区分品种的冬小麦活动积温及有效积温,对比分析了6种积温（GDD）模型和发育时间（DD）模型统计变量的变异系数（CV）及模拟偏差（SD）,结果表明：GDD模型对阶段积温模拟的稳定性较DD模型对发育日数的模拟效果更佳;区分品种的变量稳定性相对不分品种的稳定性更大且模拟效果更好;对比模型有效率（ME）、均方根误差（RMSE）及标准化均方根误差（NRMSE）得出结论：6种GDD模型相对DD模型对发育期的模拟效果均达到优秀;分品种的模拟效果较不分品种的模拟更优;同一线性假设中,活动积温比有效积温模拟效果更好;3种生长假设间,线性假设B对发育期模拟效果优于A和C。

英文摘要：

To explore the impact of methods of calculating growing degree-day on simulation effect of crop development processes,the data from 1989 to 2011 of the 3 developmental phases of Miyun winter wheat including reviving-jointing, jointing-heading and heading-maturity, were analyzed. The active and effective growing degree-days （GDD） were calculated by adapting six calculating methods based on three linear （Linear A, B and C） growth assumptions on single cultivar Jingdong 8 or all cultivars. The stability of coefficient of variation （CV） and simulation deviation （SD） of development days （DD） model and GDD models were analyzed. Results showed that.. Simulation effects of GDD models for different developmental phases were excellent compared with DD model; Simulation effect of single cultivar was better than that of all cultivars; The model efficiency （ME）, Root-mean-square error （RMSE） and Normalized RMSE （NRMSE） of DD model and GDD models were compared. Results showed that： Simulation effects of 6 GDD models are all excellent compared with DD model ; Simulation effect of single cultivar was better than that of all cultivars;Simulation effect of active GDD was better than that of effective GDD for same linear growth assumptions; Simulation effect of developmental process was significantly improved by linear B than that of linear A and C among three linear growth assumptions.