摘要
利用一维多层水热耦合SHAW(The simultaneous heat and water)模型,在田间实验的基础上,模拟河南省商丘地区2015年冬小麦拔节后近地面层0~40 cm垂直方向上的每小时气温变化特征。结果表明,冬小麦近地面层气温模拟整体效果较好,其中48%模拟的绝对误差低于1℃,75%模拟的绝对误差低于2℃,不同高度上模型效率ME均大于0.94;夜晚气温的模拟效果优于白天的模拟效果,白天11:00—14:00气温被过低估计,并随着近地面层高度的增加,模拟值误差越大;近地面层内3种气温特征值模拟效果的优劣依次为:日平均气温、日最低气温、日最高气温,其中,日平均气温模拟值与实测值基本吻合,日最低气温被略微高估,日最高气温被过低估计。此外,SHAW模型在冬小麦拔节后6个生育期的模拟效果均存在差异,拔节期、灌浆期和乳熟期模拟效果较好,孕穗期和开花期次之,抽穗期模拟效果相对较差。
The air temperature within near-ground layer is an important surrounding factor that can affect winter wheat growth. The simultaneous heat and water( SHAW) model,which is a detailed process model of heat and water movement in the plant-snow-residue-soil system,was evaluated in simulating the air temperature within near-ground layer from 0 cm to 40 cm at after-jointing stage of winter wheat. Field experiment was taken in Shangqiu City, Henan Province to observe the winter wheat growth and surrounding factors,such as air temperature. The SHAW model was calibrated and driven with inputs of part of field experiment data and empirical parameters. The results showed that the SHAW model performed well in simulating air temperature within near-ground layer in winter wheat field,with 48% of the absolute error of simulated values was less than 1℃,75% of the absolute error of simulated values was less than 2℃,and the model efficiency at different heights was higher than 0. 94. The simulated values had higher biases during the day than those at night and they were increased with the increase of height from ground,and their biases generally reached the largest value during 11: 00 and 14: 00. The daily mean values of the simulated and observed air temperature values were basically the same,while the daily lowest values were overestimated and the daily highest values were underestimated. The model had better effects at jointing,filling and dough stages than those at booting,blooming and heading stages.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2015年第S1期274-282,共9页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金资助项目(41471342)
关键词
冬小麦
气温模拟
近地面层
SHAW模型
Winter wheat
Air temperature simulation
Near-ground layer
SHAW model
