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Hydrological fluxes of a crest laurel subtropical forest in the Garajonay National Park

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2007 ASAE Annual Meeting  072299.(doi:10.13031/2013.23503)
Authors:   Axel Ritter, Carlos M Regalado
Keywords:   Evapotranspiration; forest hydrology; fog precipitation; laurisilva; canopy water interception; subtropical mountain cloud forest

A study was carried out to quantify the relative importance of the hydrological fluxes involved in crest areas of a laurel subtropical forest ecosystem in the Garajonay National Park (Canary Islands). From a two-year time series of micrometeorological measurements, the forest water inputs and potential evapotranspiration were quantified. Different models were adapted for this type of vegetation to describe physical processes such as potential evapotranspiration, canopy interception losses and the impaction of fog water droplets onto cylindrical elements (needle-like leaves). Conventional precipitation shows seasonality, while impaction models predict that fog precipitation acts as an additional water supply distributed along the year, representing around 20-45% of total yearly rainfall. Due to the prevailing climatic conditions and the stomatal control exhibited by this vegetation, the forest water demand is constrained by reduced yearly evapotranspiration values, which are satisfied mainly by rainfall and additionally by fog interception.

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