The role of interception and desuction in the dynamics of run-off formation
2004
Pichler, V.,Technical University in Zvolen (Slovak Republic). Faculty of Forestry | Gregor, J.
Presented study investigates the influence of interception and desuction in a beech forest on the amount of water available for run-off from a forest soil. Until recently, there has been a prevailing opinion that run-off can be influenced mainly through opening or closing forest canopy by partial cuttings. However, based on combined measurements of soil water content and new methods for predicting soil hydraulic conductivity it was established that in a lower middle-mountains beech ecosystem desuction outweighed interception as the factor reducing soil water amount available for run-off. Towards the end of the vegetation period, in September, desution reached 1,91 mm/day, whereas the daily interception loss was only 0,94 mm/day. The desuction was effected mainly by the continuing transpiration of understorey trees in the stand since those trees were deprived of sufficient water supply needed during the main vegetation season. New findings thus indicate that forestry operations must consider both canopy closure, stand density and structure in order to optimise water-management function of forests, mainly those composed of tree species featuring high ecological plasticity.
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