Bremen 2017 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 4: Boden- und Agrarphysik
UP 4.1: Vortrag
Dienstag, 14. März 2017, 15:45–16:00, GW2 B3009
Assessment of the hydrological effect of fire-induced vegetation changes on evapotranspiration at a regional scale — •Melanie Häusler1, João Manuel Neves Silva1, João Pedro Nunes2, Paula Soares1, Thorsten Warneke3, Jan Jacob Keizer4, and José Miguel Cardoso Pereira1 — 1CEF, Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal — 2CE3C, Centre for Ecology, Evolution and Environmental Changes, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal — 3Institute of Environmental Physics, University of Bremen, 28359 Bremen, Germany — 4CESAM and Department of Environment and Planning, University of Aveiro, Aveiro, Portugal
This study aims to understand the changes of evapotranspiration (ET) in eucalyptus stands in the Caramulo Mountain range, located around 30 km inland from the city Aveiro, Portugal. A two-source energy balance model in combination with medium-resolution imagery (Landsat 8) was used to estimate ET and its changes over time. The fire events occurred from 2011 to 2013, and their effects on fire-driven changes in ET, albedo and partial vegetation cover (Pv) were assessed for the years 2013 to 2015. Model estimates were compared to ground-based measurements, where evaporation was assumed to be equal to interception (Gash model to retrieve rainfall interception) and transpiration estimated by a water balance fed by soil moisture measurements. Results show that ET and its evolution over time was driven by fire severity and forest properties.