Comparison of three models to estimate evapotranspiration for a temperate mixed forest

摘要: Forest evapotranspiration is one of the main components in regional water budget. A comparison between measured and estimated eddy covariance (EC) data, considering, Katerji-Perrier (KP), Todorovic (TD) Priestley-Taylor (PT) actual methods, was carried out. These models, relying on more easily obtainable are valuable when long-term direct measurements not available. The objective this paper to compare effectivity these three models. In paper, experimental data were obtained within temperate mixed forest broad-leaved coniferous trees Changbai Mountains northeastern China during growing seasons 2003 2005. KP method gave most effective values for half-hourly daily computed by Summing Up estimates, TD overestimated about 30%. diurnal courses showed bell curves, similar that net radiation. except a slight increase at 14:30 solar time due peak value vapour pressure deficit (VPD). For case using mean micrometeorological variables, PT presented closest measurements. Accuracy estimation related VPD negatively (especially > 1.5 kPa). parameters, considered be vegetation dependent, = 0.545 b 1.31 site. constant parameter (alpha 1.18) applied evapotranspiration. Daily alpha responded (negatively) strongly than soil moisture (positively) forest. experiment inherent limits advantages methods. method, semi-empirical approach, preferred estimate Was mechanistic approach reference always being site dependent simplest enough large time-scale (at least daily) Copyright (C) 2008 John Wiley & Sons, Ltd.