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Medientyp:
E-Artikel
Titel:
Technical note: Estimating light-use efficiency of benthic habitats using underwater O<sub>2</sub> eddy covariance
Beteiligte:
Attard, Karl M.;
Glud, Ronnie N.
Erschienen:
Copernicus GmbH, 2020
Erschienen in:Biogeosciences
Sprache:
Englisch
DOI:
10.5194/bg-17-4343-2020
ISSN:
1726-4189
Entstehung:
Anmerkungen:
Beschreibung:
<jats:p>Abstract. Light-use efficiency defines the ability of primary producers to convert
sunlight energy to primary production and is computed as the ratio between
the gross primary production and the intercepted photosynthetic active
radiation. While this measure has been applied broadly within terrestrial
ecology to investigate habitat resource-use efficiency, it remains underused
within the aquatic realm. This report provides a conceptual framework to
compute hourly and daily light-use efficiency using underwater O2 eddy
covariance, a recent technological development that produces habitat-scale
rates of primary production under unaltered in situ conditions. The
analysis, tested on two benthic flux datasets, documents that hourly
light-use efficiency may approach the theoretical limit of 0.125 O2 per photon under low-light conditions, but it decreases rapidly towards
the middle of the day and is typically 10-fold lower on a 24 h basis.
Overall, light-use efficiency provides a useful measure of habitat
functioning and facilitates site comparison in time and space.
</jats:p>