Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 7 4 2010 10.5194/bg-7-1247-2010 http://www.biogeosciences.net/7/1247/2010/ http://www.biogeosciences.net/7/1247/2010/bg-7-1247-2010.html http://www.biogeosciences.net/7/1247/2010/bg-7-1247-2010.pdf 1247 1261 2010-04-13 Decadal water balance of a temperate Scots pine forest (<i>Pinus sylvestris</i> L.) based on measurements and modelling B. Gielen bert.gielen@ua.ac.be H. Verbeeck J. Neirynck D. A. Sampson F. Vermeiren I. A. Janssens University of Antwerp, Research Group Plant and Vegetation Ecology, Universiteitsplein 1, 2610 Wilrijk, Belgium Ghent University, Laboratory of Plant Ecology, Department of Applied Ecology and Environmental Biology, Faculty Bioscience Engineering, Coupure Links 653, 9000 Ghent, Belgium Research Institute for Nature and Forest, Gaverstraat 4, 9500 Geraardsbergen, Belgium Arizona State University, Decision Center for a Desert City, Global Institute of Sustainability, Tempe, AZ 85287, USA We examined the water balance components of an 80-year-old Scots pine (<i>Pinus sylvestris</i> L.) forest stand in the Campine region of Belgium over a ten year period using five very different approaches; our methods ranged from data intensive measurements to process model simulations. Specifically, we used the conservative ion method (CI), the Eddy Covariance technique (EC), an empirical model (WATBAL), and two process models that vary greatly in their temporal and spatial scaling, the ORCHIDEE global land-surface model and SECRETS a stand- to ecosystem-scale biogeochemical process model. Herein we used the EC technique as a standard for the evapotranspiration (ET) estimates. Using and evaluating process based models with data is extremely useful as models are the primary method for integration of small-scale, process level phenomena into comprehensive description of forest stand or ecosystem function. Results demonstrated that the two process models corresponded well to the seasonal patterns and yearly totals of ET from the EC approach. However, both WATBAL and CI approaches overestimated ET when compared to the EC estimates. 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