Diurnal fluctuations in root oxygen release rate and dissolved oxygen budget in wetland mesocosm

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dc.contributor.author Dong, C.
dc.contributor.author Zhu, W.
dc.contributor.author Zhao, Y.Q.
dc.contributor.author Gao, M.
dc.date.accessioned 2011-08-26T15:42:52Z
dc.date.available 2011-08-26T15:42:52Z
dc.date.copyright 2011 Elsevier en
dc.date.issued 2011-05
dc.identifier.citation Desalination en
dc.identifier.issn 0011-9164
dc.identifier.uri http://hdl.handle.net/10197/3112
dc.description.abstract To assess the role of plants for oxygen offering in constructed wetlands, this study experimentally evaluated the amount of root oxygen release rate using mass balance method. The mass balance calculation is based on the following components: respiratory oxygen consumption of the roots; oxygen required for degradation of the organic matters; oxygen required for nitrification; and the amount of dissolved oxygen in the influent, effluent and substrate water. Experimental results have demonstrated that the root oxygen release rate was ranged from 20.3 to 58.3gO2/m2.d with average value of 38.4gO2/m2.d, which was affected dramatically by light intensity. Only 35% and 9% of the oxygen released by roots were used in the degradation of organic matters and nitrogen-nitrification, respectively, while 56% was used for roots respiration with little to be released to the surrounding medium. The results also showed that diurnal fluctuation of oxygen release and light intensity followed unimodal distribution. Meanwhile, a better understanding of the DO (dissolved oxygen) budget was proposed. Root oxygen release rate could be described by two fractions. One is “net specific oxygen release rate” and the other is “dischargeable oxygen release rate”. en
dc.description.sponsorship Other funder en
dc.format.extent 385263 bytes
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Elsevier en
dc.relation.requires Architecture, Landscape & Civil Engineering Research Collection en
dc.relation.requires Critical Infrastructure Group Research Collection en
dc.relation.requires Urban Institute Ireland Research Collection en
dc.rights This is the author’s version of a work that was accepted for publication in Desalination. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Desalination, 272 (1-3): 254-2582 DOI: 10.1016/j.desal.2011.01.030. en
dc.subject Constructed wetlands en
dc.subject Diurnal variation en
dc.subject DO budget en
dc.subject Mass balance method en
dc.subject Oxygen release rate en
dc.subject.lcsh Constructed wetlands en
dc.subject.lcsh Gases from plants--Measurement en
dc.subject.lcsh Water--Dissolved oxygen en
dc.subject.lcsh Mass budget (Geophysics) en
dc.subject.lcsh Biological rhythms in plants en
dc.title Diurnal fluctuations in root oxygen release rate and dissolved oxygen budget in wetland mesocosm en
dc.type Journal Article en
dc.internal.availability Full text available en
dc.internal.webversions Publisher's version en
dc.internal.webversions http://dx.doi.org/10.1016/j.desal.2011.01.030 en
dc.status Peer reviewed en
dc.identifier.volume 272 en
dc.identifier.issue 1-3 en
dc.identifier.startpage 254 en
dc.identifier.endpage 258 en
dc.identifier.doi 10.1016/j.desal.2011.01.030
dc.neeo.contributor Dong|C.|aut| en
dc.neeo.contributor Zhu|W.|aut| en
dc.neeo.contributor Zhao|Y.Q.|aut| en
dc.neeo.contributor Gao|M.|aut| en
dc.description.othersponsorship The National Natural Science Foundation of China (NSFC) en
dc.description.othersponsorship Ministry of Water Resources the People's Republic of China en


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