基于生长度日的甘薯植株发育模拟模型的研究

Study of Simulation Model of Sweet Potato Plants Development Based on Growing Degree Days

根据发育阶段生长度日恒定的原理和大田栽培试验,将大田甘薯生长发育阶段划分为发根还苗期、分枝结薯期、薯蔓同长期和薯块盛长期,建立大田甘薯地上部植株发育的动态模拟模型,并确定了发育阶段生长度日的参数,系统的预测甘薯生长发育阶段。模型检验结果表明,甘薯发育动态模拟模型具有较高的精确性,实测值与模拟值二者吻合较好。其中,模型对三个品种整个生育期的预测误差绝对值分别为3天、5天、4天,对济薯21的预测效应最好,其4个生育阶段的预测误差绝对值分别为2天、3天、3天、2天,均小于模型的综合效应评价值(3天、5天、4天)。

The simulation model of sweet potato under field condition was developed according to invariance of growing degree days and field cultivation experiment.The parameter of growing degree days in different development stages was quantified and different development stages were predicted systematically.Its development stages contained rooting and seeding stage,branching and tuberization stage,tube and vine growth stage and tuber vigorous growth stage.Model test showed that this model was of high accuracy,Results of test showed that the measurement value and the evaluation one were identical well.The absolute value of prediction error for simulation model of 3 cultivars was 3 d,5 d and 4 d.The prediction effect for simulation model of ＇Jishu21＇ was the best in the 3 cultivars.The absolute value of prediction error for 4 development stages of ＇ Jishu21 ＇ was 2 d,3 d,3 d and 2d,they were all less than the comprehensive evaluation value （3 d,5 d 4 d） for simulation model.