小麦籽粒灌浆速率的模拟

摘要

籽粒灌浆期是小麦产量和品质形成的关键时期。为了定量分析小麦籽粒灌浆速率的变化规律，本研究以济南17(早熟)和济麦22(中晚熟)为材料，于2012~2013年在大田条件下研究不同施氮水平小麦籽粒千粒质量及灌浆参数的变化规律，并建立了小麦籽粒灌浆速率模型。经独立试验资料检验，小麦1000粒籽粒灌浆速率实测值与模拟值的根均方差( RMSE)、平均绝对误差( da )和决定系数( R2)分别为0.208 g/d、0.162 g/d和0.899。表明实测值与模拟值的吻合程度较好，所建模型可较好地模拟不同熟性、不同品种及不同氮素处理的小麦籽粒灌浆速率。%The grain filling stage was the key period of yield and quality formation for wheat. To quantitatively ana-lyze the changes of grain filling rate, wheat varieties Jinan 17 ( early maturing) and Jimai 22 ( late maturing) were adopted as materials to study the changes of 1 000-grain weights and some grain filling parameters at different nitrogen application levels in the field from 2012 to 2013, and the grain filling rate model was developed as a result. The model was validated u-sing independent experimental data sets. The results showed that the root mean squared error ( RMSE) , mean absolute er-ror ( da ) and determinant coefficient ( R2 ) between the simulated and measured values for wheat 1 000-grain filling rate were 0. 208 g/d, 0. 162 g/d and 0. 899, respectively, indicative of the good fit of the model. The model is applicable in simulating grain filling rate of wheat differring in maturity, variety and nitrogen application level.