Energy Balance and Its Distribution in a Maize Field

摘要

The diurnal change of net solar radiation,latent heat flux,sensible heat flux and soil heat flux by the Bowen-ratio system under different cropping season and different weather condition were observed.The results show that the diurnal change curve of the solar net radiation,latent heat flux and soil heat flux are all the typical single-peak curve,and the change mainly occurred between 6:00 and 20:00 and in the rest time the value is nearly negative.Under different weather conditions,the variations were different,which reached the maximum on sunny day and the minimum on overcast day.Sensible heat flux changed rulelessly because of the complicated factor.The diurnal change process is common between latent heat flux and net radiation.Weather condition has a bigger influence on evaporation than on transpiration.