水氮胁迫对冬小麦籽粒灌浆速率影响的模拟研究

为定量分析水氮胁迫对冬小麦籽粒灌浆速率的影响,以‘济麦22’为材料,于2016—2017和2017—2018年度开展施氮试验。结合2017—2018年度试验资料,通过分析水氮胁迫对冬小麦籽粒灌浆速率的影响规律,引入氮素和水分影响因子,构建水氮胁迫对冬小麦籽粒灌浆速率影响的模拟模型S_(j,t)=S_(W3N300,t)×(1+F_N)×(1+F_W)。经2016—2017年小麦生长数据检验,除绝对误差占实测值比率d_ap略高外,RMSE值、平均绝对误差d_a以及相关系数r均显示模拟值和实测值有较高的一致性,说明实测值与模拟值吻合程度较好,所建模型可较好模拟水氮胁迫对冬小麦籽粒灌浆速率的影响。

Simulation of Grain Filling Rate of Winter Wheat Under Water and Nitrogen Stress

To quantitatively analyze the effects of water and nitrogen stress on winter wheat grain filling rate, we carried out field experiments in 2016-2017 and 2017-2018 growing seasons using winter wheat variety ‘Jimai 22’ under various water and nitrogen application levels. On the basis of experiment data collected in the 2017-2018 growing season, a simulation model of winter wheat grain filling rate under water and nitrogen stress was built by analyzing the influence rule of water and nitrogen stress on winter wheat grain filling rate, as well as introducing the water and nitrogen impact factors, and could be specifically described as: S_(j,t)=S_(W3N300,t)×(1+F_N)×(1+F_W). The model was then validated with an independent dataset collected in the 2016-2017 growing season. Except the ratio of mean absolute error (d_a) to the mean observation (d_ap), the root mean squared error (RMSE), mean absolute error (d_a), and correlation (r) all showed that the simulated values were well identical to the measured ones. The model can be used to simulate the effects of water and nitrogen stress on winter wheat growth and yield.