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. Although it is well known that evapotranspiration (ET) represents an important water flux at local to global scales, few studies have quantified themagnitude and relative importance of ET and its individual flux components inhigh-latitude forests. In this study, we combined empirical sapflux, throughfall, and eddy-covariance measurements with estimates from a process-based model to partition the water balance in a northern borealforested catchment. This study was conducted within the Krycklan catchment, which has a rich history of hydrological measurements, thereby providing us with the unique opportunity to compare the absolute and relative magnitudes ofET and its flux components to other water balance components. During thegrowing season, ET represented ca. 85 % of the incoming precipitation. Bothempirical results and model estimates suggested that tree transpiration( T ) and evaporation of intercepted water from the tree canopy ( IC) represented 43 % and 31 % of ET, respectively, and together were equal to ca. 70 % of incoming precipitation during the growing season. Understory evapotranspiration (ETu) was less important than T and IC during most of thestudy period, except for late autumn, when ETu was the largest ET flux component. Overall, our study highlights the importance of trees in regulating thewater cycle of boreal catchments, implying that forest management impacts onstand structure as well as climate change effects on tree growth are likelyto have large cascading effects on the way water moves through theseforested landscapes.

Partitioning growing season water balance within a forested boreal catchment using sap flux, eddy covariance, and a process-based model