计算农田蒸散量的冠层温度法研究

目前,测算农田蒸散的方法有许多种,但都难以准确地求出大面积范围内的平均蒸散.红外测温技术由蒸散的估算提供了一种新的方法,本文在对几种冠层温度——蒸散模型评述的基础上,由实测资料用Brown-Rosenbefg模型计算了冬小麦郁闭地面后的农田蒸散并与波文比方法计算的蒸散做了比较.结果表明,该模型可以较好地用于计算作物郁闭地面后的农田蒸散.

THE STUDY OF USING CANOPY TEMPERATURE TO ESTIMATE EVAPOTRANSPIRATION

Though there are many approaches to measure and estimate evapotranspiration,it is difficult to calculate the average evapotranspiration in large areas.Nowadays,with the development of infrared thermometry,a new approach was presented to estimate evapotranspi ration.In the paper,on the basis of revewing canopy temperatureevapotranspiration models,the Brown-Rosenberg model was used to calculate the evapotranspiration of winter wheat for full canopy cover with the meaaured data.And the results were compared with those of Bowen-ratio method.The comparison showed that this model might be used to calculate evapotranspiration for full canopy cover.