Denitrification measurements of sediments using cores and chambers

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Show simple item record Macreadie, PI Ross, DJ Longmore, AR Keough, MJ 2012-02-02T06:49:10Z 2006-11-17
dc.identifier.citation Marine Ecology Progress Series, 2006, 326 pp. 49 - 59
dc.identifier.issn 0171-8630
dc.identifier.other C1UNSUBMIT en_US
dc.description.abstract 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. © Inter-Research 2006.
dc.language eng
dc.relation.isbasedon 10.3354/meps326049
dc.title Denitrification measurements of sediments using cores and chambers
dc.type Journal Article
dc.description.version Published
dc.parent Marine Ecology Progress Series
dc.journal.volume 326
dc.journal.number en_US
dc.publocation Germany en_US
dc.identifier.startpage 49 en_US
dc.identifier.endpage 59 en_US SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 0602 Ecology
dc.personcode 108249
dc.percentage 100 en_US Ecology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US
dc.location.activity en_US
dc.description.keywords Benthic chambers
dc.description.keywords Denitrification
dc.description.keywords Disturbance
dc.description.keywords Macrofauna
dc.description.keywords Nutrient flux
dc.description.keywords Port Phillip Bay
dc.description.keywords Sediment cores
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Strength - C3
utslib.copyright.status Open Access 2015-04-15 12:23:47.074767+10
pubs.consider-herdc false
utslib.collection.history General (ID: 2)

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