Der Einfluß der Expositionszeit auf die Höhe der Bodenatmung bei Anwendung der Lundegardhmethode

The influence of exposure time on the magnitude of soil respiration under employment of the Lundegardh-procedure To assess the role of carbon-rich soils under a potential climate change much more data are needed then currently available. These have to be collected also under conditions, where only limited technical and personal resources are available. Therefore the easy to be accomplished Lundegardh-procedure, which is accepted as a standard procedure for exposure times up to 24 hours (Anderson, 1982), was tested for its suitability to longer periods of exposure. For this purpose six Lundegardh-traps were installed on seven consecutive days (treatment B), and the means of the six repetitions added to a weekly value. In the immediate vicinity to the former, six Lundegardh-traps were installed for periods from one to seven days (treatment A) This was done during the warm season as well as in the winter. The comparison of the treatments A and B revealed a linear correlation, which allows to substitute cumulated daily values by values of traps, that have been installed for several days. However, the “chamber-effect”, an overestimation of respiration by the traps installed for more than 24 hours found by Tesarova and Gloser (1976) has to be considered. In the summer, the same degree of overestimation (16%) was found as reported by Tesarova and Gloser (1976). In the winter, far lower absolute values and therefore higher statistical importance of extremes led to an overestimation of 46%.