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Abstract:
Relaxed eddy accumulation is applied for measuring fluxes of trace gases for which
there is a lack of sensors fast enough in their resolution for eddy-covariance. On managed
grasslands, the length of time between management events and the application
5 of relaxed eddy accumulation has an essential influence on the determination of the
proportionality factor b and thereby on the resulting flux. In this study this effect is
discussed for the first time. Also, scalar similarity between proxy scalars and scalars
of interest is affected until the ecosystem has completely recovered. Against this background,
CO2 fluxes were continuously measured and 13CO2 isofluxes were determined
10 with a high measurement precision on two representative days in summer 2010. This
enabled the evaluation of the 13CO2 flux portion of the entire CO2 flux, in order to estimate
potential influences on tracer experiments in ecosystem sciences and to compare
a common method for the partitioning of the net ecosystem exchange into assimilation
and respiration based on temperature and light response with an isotopic approach
15 directly based on the isotope discrimination of the biosphere.
