Oxic microzones and radial oxygen loss from roots of Zostera marina

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dc.contributor.author Jensen, Sheila en_US
dc.contributor.author Kuhl, Michael en_US
dc.contributor.author Glud, Ronnie en_US
dc.contributor.author Jorgensen, Lise en_US
dc.contributor.author Prieme, Anders en_US
dc.contributor.editor en_US
dc.date.accessioned 2012-02-02T07:23:18Z
dc.date.available 2012-02-02T07:23:18Z
dc.date.issued 2005 en_US
dc.identifier 2009005237 en_US
dc.identifier.citation Jensen Sheila et al. 2005, 'Oxic microzones and radial oxygen loss from roots of Zostera marina', Inter Research, vol. 293, pp. 49-58. en_US
dc.identifier.issn 0171-8630 en_US
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/14873
dc.description.abstract Oxygen microelectrodes and planar oxygen optodes were used to map the microdistribution of oxygen and the radial oxygen loss (ROL) from roots of Zostera marina kept in natural sediment. Substantial heterogeneity in the oxygen distribution was seen along the roots, with oxygen mainly leaking out from the root tips. Maximum oxygen levels at the root surface reached 19 to 80% of air saturation in the light and the oxygenated zone extended 1 to 2 mm away from the root tip. The oxygen concentration at the root surface decreased to 0?5% of air saturation at positions 3 to 6 mm behind the root apex. The high oxygen levels at the root tip surface were due to an effective barrier to ROL on the older part of the roots and the presence of an effective gas-transport system in the plant, with numerous intercellular spaces extending very close to the apical meristem of the root. Radial diffusion of oxygen from the root surface created a dynamic 0 to 1 mm-wide oxic microzone around the ~0.3 mm wide roots of Z. marina that varied with irradiance and distance from the root tip. Root-surface oxygen concentrations and ROL measured 2 mm behind the apex increased with increasing irradiance until ROL saturation was reached at irradiances >400 ?mol photons m?2 s?1. The ROL increased from 16.2 nmol O2 cm?2 h?1 in darkness to 21.6, 28.8 and 36.0 nmol O2 cm?2 h?1 at incident irradiances of 25, 111 and 467 ?mol photons m?2 s?1, respectively. Based on measured steady-state radial oxygen profiles, the total oxygen export from one 6 cm long root of the first actively growing root bundle with a total surface area of 0.56 cm2 was estimated to be 6.0 to 6.7 nmol O2 h?1 in saturating light. en_US
dc.language en_US
dc.publisher Inter Research en_US
dc.relation.isbasedon http://dx.doi.org/10.3354/meps293049 en_US
dc.title Oxic microzones and radial oxygen loss from roots of Zostera marina en_US
dc.parent Marine Ecology Progress Series en_US
dc.journal.volume 293 en_US
dc.journal.number en_US
dc.publocation Germany en_US
dc.identifier.startpage 49 en_US
dc.identifier.endpage 58 en_US
dc.cauo.name SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 060200 en_US
dc.personcode 0000061187 en_US
dc.personcode 107129 en_US
dc.personcode 0000061174 en_US
dc.personcode 0000062205 en_US
dc.personcode 0000061188 en_US
dc.percentage 100 en_US
dc.classification.name Ecology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity en_US
dc.description.keywords Radial oxygen loss ? Microelectrodes ? Optodes ? Zostera marina ? Rhizosphere en_US


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