Prerequisites for application of hyperbolic relaxed eddy accumulation on managed grasslands and alternative net ecosystem exchange flux partitioning
Relaxed eddy accumulation is still applied in ecosystem sciences for measuring trace gas fluxes. On managed grasslands, the length of time between management events and the application of relaxed eddy accumulation has an essential influence on the determination of the proportionality factor <i>...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2014-12-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | http://www.atmos-meas-tech.net/7/4237/2014/amt-7-4237-2014.pdf |
| Summary: | Relaxed eddy accumulation is still applied in ecosystem sciences for
measuring trace gas fluxes. On managed grasslands, the length of time between
management events and the application of relaxed eddy accumulation has an
essential influence on the determination of the proportionality factor <i>b</i>
and thus 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, CO<sub>2</sub> fluxes were continuously measured and
<sup>13</sup>CO<sub>2</sub> isofluxes were determined with a high measurement precision
on two representative days in summer 2010.
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Moreover, a common method for the partitioning of the net ecosystem exchange
into assimilation and respiration based on temperature and light response was
compared with an isotopic approach directly based on the isotope
discrimination of the biosphere. This approach worked well on the grassland
site and could enhance flux partitioning results by better reproducing the
environmental conditions. |
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| ISSN: | 1867-1381 1867-8548 |