苹果树主干温度变化特征及其与气温的关系

A preliminary study on the variation of apple tree trunk temperature and its relation with air temperature

对苹果树主干温度与气温进行监测,分析苹果树主干温度日变化和季节变化,利用曲线回归建立不同天气类型下苹果树主干温度与气温的关系模型.结果表明:果树主干温度与气温关系密切,两者日平均值、极值大小、极值出现时间在不同天气类型下表现出不同的情况.夏、秋、冬三季气温波动比果树主干温度大,春季与之相反.利用模型效率系数对建立的不同模型进行评价,结果显示:晴天夜晚、阴天夜晚和雨天白天的模型效果最佳,效率系数超过0.9,模拟值与实测值之间的平均绝对误差小于2℃,适用于晴天夜晚、阴天夜晚及雨天白天的主干温度模拟.

To study the relationship between the apple tree trunk temperature and the air temperature, this paper designs experiments to monitor the air temperature and temperature of apple tree trunk and makes a preliminary analysis on diurnal and seasonal variations. Based on this, the relationship models of air temperature and trunk temperature in different weather types are established by curve regression. The models show that the apple tree trunk temperature is closely related to the air temperature. The daily average values, the extreme values, and the extreme value occurrence times of these two temperatures are different in different weather types. The fluctuations of the air temperature in summer, autumn and winter are larger than that of the apple tree trunk temperature, however, the situation is opposite in spring. In order to evaluate the efficiency of the models established in this paper, the efficiency coefficient is introduced. The evaluation results show that the models on sunny nights, cloudy nights and rainy days have the best effect, with efficiency coefficients larger than 0.9.And the average absolute errors between the simulated values of the established models and measured values are less than2 °C, which indicates that the models established in this paper are suitable for the simulation of the trunk temperature on sunny nights, cloudy nights and rainy days.