Energy Budget in a Paddy Field

抄録

Characteristics of diurnal variations of sensible and latent heat fluxes above and within plant canopies were presented, using the data obtained by the eddy correlation method. The results show that the latent heat fluxes above plant canopies are much larger than those within plant canopies and that they are also much larger than sensible heat fluxes above plant canopies. The upper part of plant canopies contributes as a sink for sensible heat and a source of water vapor. The downward sensible heat fluxes could be readily observed in a paddy field. Model calculation shows that this may be caused by combinations of several factors such as lower insolation, higher air temperature, and higher wind speed.