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Estimation of evapotranspiration rates for willow and reed stands. In: 7th Intecol International Wetlands Conference 2004
Autor: Frahm, Enrico
Mitarbeiter: Miegel, Konrad; Salzmann, Thomas
In:
7th Intecol International Wetlands Conference 2004
Ort: Utrecht
Jahr: 2004
Einordung:
Institut: Professur Hydrologie und Angewandte Meteorologie
Abstract:
Introduction
Running investigations at the University of Rostock are focussed on the water regime of a typical riverine fen in the northeast lowlands of Germany, related to the river Warnow and its outflow system. The discharge behaviour of the river, which is substantially affected by its floodplain and river fens, has not yet been sufficiently researched or quantified. The specification and quantification of one important element in this system, evapotranspiration, is the central theme of this presentation.
The aim of this study is to obtain meaningful parameters for the determination of the actual evapotranspiration by carrying out extensive investigations of the hydrologic, climatological and phytological situation of the riverine fens of the river Warnow. There will be an comparison of the Evapotranspiration rates between the two mean vegetation units: willow (Salix spp.) and reed (Phragmites australis) stands.
Method
The site
The study site (with an area of 0,9 km2) is located in a riverine fen along the River Warnow about 5 km south of Rostock, northeast of Germany. Because of the formerly use of the wetland for peat mining/agriculture and the present hydraulic interactions with the river Warnow, the upper peat is lightly humified. The hydraulic situation is mainly effected by the river Warnow. During the year the groundwater level is relatively close to subsurface (between 0,10 m and 0,60 m).
Theory
Two methods are used for estimating the evapotranspiration of the vegetation. There will be an comparison between a meteorological and an hydrological measurement program to estimtate characteristic surface resistance (rs) and aerodynamic resistance (ra).
Measurements
The hydraulic measurements include the recording of diurnal fluctuations of groundwater level, soil water tension and soil water content. All required meteorological parameters for using the Penman-Monteith-equation are measured, in addition to rainfall, wind speed and wind direction. Also measured is the leaf area index by using the LAI-2000 Plant Canopy Analyzer. Ansprechpartner Weitere Information im WWW
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Letzte Änderung des Eintrages:
05.02.2008
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