A comparison of evapotranspiration rates for willow and reed in a riverine fen

Autor: Frahm, Enrico
Mitarbeiter: Miegel, Konrad; Salzmann, Thomas
In:

W3M Conference – For Wetlands: Monitoring, Modelling and Management. Wierzba, Polen

Jahr: 2005

Einordung:
Institut: Professur Hydrologie und Angewandte Meteorologie

Abstract:
A comparison of evapotranspiration rates for willow and reed in a riverine fen
E. Frahm, K. Miegel, Th. Salzmann

Institute for Environmental Engineering, University of Rostock, 18051 Rostock, Germany
(enrico.frahm@auf.uni-rostock.de), (konrad.miegel@agrarfak.uni-rostock.de),
(Thomas.salzmann@agrarfak.uni-rostock.de)

The aim of this study is to estimate the evapotranspiration rate of willow (Salix spp.) and reed (Phragmites australis) in a riverine fen. Because of using the Penman-Monteith equitation it will be assess characteristic surface resistance (rs) and aerodynamic resistance (ra). Finally there will be a comparison of the evapotranspiration rates of the two main vegetation units willow and reed.
The study side is situated in a typical riverine fen area of the German northeast lowlands along the river Warnow. Current investigations of the University of Rostock are focused on the water regime of this fen, which is related with the river Warnow and its discharge regime. This discharge behaviour of the river is affected substantially by the water regime of their floodplains including riverine fens. The specification and quantification of an important element in this process structure, the evapotranspiration, is the topic of this present work.
Two methods are used for estimating the evapotranspiration by the vegetation. There will be an comparison between an hydrological and a meteorological measurement program to estimate characteristic surface resistance (rs) and aerodynamic resistance (ra). The hydrological measurements including the recording of diurnal fluctuations of groundwater level, soil moisture and soil moisture tension with a time slice of 15 minutes. All required meteorological parameters for using the Penman-Monteith equation are measured in the field with the same short time intervalls, additionally rainfall, wind speed and wind direction. Also measured is the leaf area index by using the LAI-2000 Plant Canopy Analyzer. For characterising the interception storage the throughfall were measured within the willow.
First data interpretation are showing e.g. a maximum diurnal fluctuation of groundwater level of 9 cm beneath the willow and 6 cm beneath the reed vegetation. This results linked with other measurement results are an indication of significant differences between the evapotranspiration rates of reed and willow stands.

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