温室黄瓜发育期模拟模型的检验

针对作物生育期研究主要有3种方法:有效积温法、生理发育时间法和正弦指数函数法。试验选取不同温室不同茬口黄瓜的发育期数据和温室环境数据对3种发育期模拟模型方法进行验证。温室黄瓜发育期的预测结果表明,正弦指数函数法预测准确而稳定,回归估计标准误差(RMSE)在0.8~2.4d之间,以每日平均气温和每小时平均气温为输入值的生理发育时间法RMSE值分别在0.8~6.1和0.8~7.0d,有效积温法1.3~6.2d。基于以上验证结果,3种模拟预测发育期方法中,正弦指数函数法表现出较好的预测性和较强的机理性,适用于作物发育期的预测。

Verification and evaluation of development stage model for greenhouse cucumber

Accurate simulation of plant development is an important component in crop simulation models since many biochemical actions change with plant development stage.Thus, it is important to find the advantages and disadvantages of each model when applied at different conditions.This study was therefore conducted to evaluate three approaches of thermal time, physiological development time and exponential sine equation for predicting crop development stages.Four greenhouse cucumber (Cucumis sativus L.) experiments were carried out in different cropping seasons.The root mean square errors (RMSE) of greenhouse cucumber in initial flowering stage, fruiting stage and mature stage for each approach were 0.8-2.4 days for exponential sine equation (Malo''s equation), (T_d) 0.8-6.1 and 0.8-7.0 days (T_h) for physiological development time and 1.3-6.2 days for thermal time (GDD).These results suggest that Malo''s equation might be suitable to predict greenhouse cucumber development stages under the environment with a wide range of photoperiods and temperatures.