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The importance of securing water resources and their efficient management has attracted more attention recently due to water deficit. In water budget analysis, however, evapotranspiration() has been approximated as the residual in the water balance equation or estimated from empirical equations and assumptions. To minimize the uncertainties in these estimates, it is necessary to directly measure . In this study, using the eddy covariance technique, we have measured in a mixed forest in the Seolmacheon catchment in Korea from September 2007 to December 2008. During the growing season(May-July), in this mixed forest averaged about , whereas it was on average during the non-growing season in winter. The annual total in 2008 was , which is about 1/3 of the annual precipitation of 1997 mm. Despite the differences in the amount and frequency of precipitation, the accumulated during the overlapping period(i.e., September to December) for 2007 and 2008 was both mm, showing virtually no difference. The omega factor, which is a measure of decoupling between forest and the atmosphere, was on average 0.5, indicating that the contributions of equilibrium and imposed to the total were about the same. The results suggest that in this mixed forest was controlled by various factors such as net radiation, vapor pressure deficit, and canopy conductance. In this study, based on the direct measurements of , we have quantified the relative contribution of in the water balance of a mixed forest in the Seolmacheon catchment. In combination with runoff data, the information on would greatly enhance the reliability of water budget analysis in this catchment.

Seasonal Variations of Evapotranspiration Observed in a Mixed forest in the Seolmacheon Catchment