Modelling drainage fluxes in managed and natural forests in the Dinaric karst: a model comparison study |
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Authors: | Ur?a Vilhar Michael Starr Klaus Katzensteiner Primo? Simon?i? Lu?ka Kajfe?-Bogataj and Jurij Diaci |
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Institution: | (1) Slovenian Forestry Institute, Večna pot 2, 1000 Ljubljana, Slovenia;(2) Department of Forest Ecology, University of Helsinki, P.O. Box 27, 00014 Helsinki, Finland;(3) Department of Forest- and Soil Sciences, Institute of Forest Ecology, University of Natural Resources and Applied Life Sciences, Peter Jordanstr. 82, 1190 Vienna, Austria;(4) Slovenian Forestry Institute, Ljubljana, Slovenia;(5) Department of Agrometeorology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, Slovenia;(6) Department of Forestry and Renewable Forest Resources, Biotechnical Faculty, University of Ljubljana, Večna pot 83, 1000 Ljubljana, Slovenia |
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Abstract: | Two models for calculating the forest water balance were applied to different development stages of managed and non-managed
forests in the Dinaric Karst for two hydrologically contrasting growing seasons. A simple model WATBAL, which calculates water
balance on a monthly basis, and the BROOK90 model, which calculates water balance on daily basis, were used. Differences between
calculated drainage fluxes between the models were less pronounced in the drier growing season and were lower in the forest
stands compared to forest gaps. Average calculated drainage fluxes of the two growing seasons were highest in the gaps and
lowest in the stand in the virgin forest remnant, followed by the mature stand in the managed forest. According to model fitting,
testing the calibration robustness and sensitivity analysis the BROOK90 model was considered best at simulating the water
balance of the various research sites. The difference in model behaviour is considered to be mainly the result of the difference
in model time step and the inclusion of macropore flow in BROOK90. The greater complexity of the BROOK90 model meant it could
be parameterized to describe more fully the complexity of the horizontal and vertical structure of forest stand and soil properties.
A disadvantage of the BROOK90 model is the greater need of input data. WATBAL, however, was useful for obtaining rougher estimates
of the water balance components and can be applied to areas where there is less data available. Choice of model is therefore
determined by data availability. |
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