Denitrification measurements of sediments using cores and chambers

Macreadie, Peter I., Ross, D. Jeff, Longmore, Andrew R. and Keough, Michael J. 2006, Denitrification measurements of sediments using cores and chambers, Marine ecology progress series, vol. 326, pp. 49-59, doi: 10.3354/meps326049.

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Title Denitrification measurements of sediments using cores and chambers
Author(s) Macreadie, Peter I.ORCID iD for Macreadie, Peter I.
Ross, D. Jeff
Longmore, Andrew R.
Keough, Michael J.
Journal name Marine ecology progress series
Volume number 326
Start page 49
End page 59
Total pages 11
Publisher Inter-Research
Place of publication Amelinghausen, Germany
Publication date 2006-11-17
ISSN 0171-8630
Keyword(s) Benthic chambers
Nutrient flux
Port Phillip Bay
Sediment cores
Summary Denitrification is commonly measured using in situ benthic chambers or laboratory incubations of sediment cores. These techniques are similar in principle but differ considerably in cost and practicality. Despite widespread use of both techniques, it is uncertain whether they give comparable results. We compared cores and chambers for measuring fluxes (dissolved oxygen [DO], N 2, NH4+, NO3- and NO 2-) and denitrification efficiency at 2 sites in Port Phillip Bay, Victoria, Australia. Overall, denitrification efficiency was not significantly different between cores and chambers, but fluxes of DO, NO 3- and NO2- differed. Chambers demonstrated higher levels of oxygen consumption and net fluxes of NO 3- and NO2- out of the sediment, suggesting that denitrification and nitrification were closely coupled. In contrast, there was a greater relative importance for uncoupled denitrification in cores as indicated by reduced oxygen consumption and net fluxes of NO 3- into the sediment. We conclude that cores and chambers give different flux results and therefore are not comparable techniques for measuring denitrification. To ascertain the cause of this, we tested the hypothesis that cores failed to adequately incorporate the impacts of macrofauna on fluxes, due to the small size of cores relative to chambers. However, densities of macrofauna were not significantly different in cores and chambers. We then hypothesised that disturbance during core collection, transportation, and handling may account for differences, but cores deployed in situ and in the laboratory gave similar results. We suggest that compression of sediment during insertion of core cylinders into the sediment may account for differences between core and chamber fluxes.
Language eng
DOI 10.3354/meps326049
Field of Research 050304 Soil Chemistry (excl Carbon Sequestration Science)
Socio Economic Objective 960503 Ecosystem Assessment and Management of Coastal and Estuarine Environments
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2006, Inter-Research
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