Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/9008
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dc.contributor.authorForrester, David Ien
dc.contributor.authorSchortemeyer, Marcusen
dc.contributor.authorStock, William Den
dc.contributor.authorBauhus, Jurgenen
dc.contributor.authorKhanna, Partap Ken
dc.contributor.authorCowie, Annetteen
dc.date.accessioned2011-12-08T10:59:00Z-
dc.date.issued2007-
dc.identifier.citationTree Physiology, 27(9), p. 1319-1328en
dc.identifier.issn1758-4469en
dc.identifier.issn0829-318Xen
dc.identifier.urihttps://hdl.handle.net/1959.11/9008-
dc.description.abstractMixtures of 'Eucalyptus globulus' Labill. and 'Acacia mearnsii' de Wildeman are twice as productive as 'E. globulus' monocultures growing on the same site in East Gippsland, Victoria, Australia, possibly because of increased nitrogen (N) availability owing to N₂ fixation by 'A. mearnsii'. To investigate whether N2 fixation by 'A. mearnsii' could account for the mixed-species growth responses, we assessed N₂ fixation by the accretion method and the 15N natural abundance method. Nitrogen gained by 'E. globulus' and 'A. mearnsii' mixtures and monocultures was calculated by the accretion method with plant and soil samples collected 10 years after plantation establishment. Nitrogen in biomass and soil confirmed that 'A. mearnsii' influenced N dynamics. Assuming that the differences in soil, forest floor litter and biomass N of plots containing 'A. mearnsii' compared with 'E. globulus' monocultures were due to N₂ fixation, the 10-year annual mean rates of N₂ fixation were 38 and 86 kg ha⁻¹ year⁻¹ in 1:1 mixtures and 'A. mearnsii' monocultures, respectively. Nitrogen fixation by 'A. mearnsii' could not be quantified on the basis of the natural abundance of 15N because such factors as mycorrhization type and fractionation of N isotopes during N cycling within the plant confounded the effect of the N source on the N isotopic signature of plants. This study shows that 'A. mearnsii' fixed significant quantities of N₂ when mixed with 'E. globulus'. A decline in δ15N values of 'E. globulus' and 'A. mearnsii' with time, from 2 to 10 years, is further evidence that N2 was fixed and cycled through the stands. The increased aboveground biomass production of 'E. globulus' trees in mixtures when compared with monocultures can be attributed to increases in N availability.en
dc.languageenen
dc.publisherOxford University Pressen
dc.relation.ispartofTree Physiologyen
dc.titleAssessing nitrogen fixation in mixed- and single-species plantations of 'Eucalyptus globulus' and 'Acacia mearnsii'en
dc.typeJournal Articleen
dc.identifier.doi10.1093/treephys/27.9.1319en
dc.subject.keywordsForestry Biomass and Bioproductsen
local.contributor.firstnameDavid Ien
local.contributor.firstnameMarcusen
local.contributor.firstnameWilliam Den
local.contributor.firstnameJurgenen
local.contributor.firstnamePartap Ken
local.contributor.firstnameAnnetteen
local.subject.for2008070502 Forestry Biomass and Bioproductsen
local.subject.seo2008820104 Native Forestsen
local.subject.seo2008820101 Hardwood Plantationsen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailacowie4@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20111202-095941en
local.publisher.placeUnited Kingdomen
local.format.startpage1319en
local.format.endpage1328en
local.peerreviewedYesen
local.identifier.volume27en
local.identifier.issue9en
local.contributor.lastnameForresteren
local.contributor.lastnameSchortemeyeren
local.contributor.lastnameStocken
local.contributor.lastnameBauhusen
local.contributor.lastnameKhannaen
local.contributor.lastnameCowieen
dc.identifier.staffune-id:acowie4en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:9198en
dc.identifier.academiclevelAcademicen
local.title.maintitleAssessing nitrogen fixation in mixed- and single-species plantations of 'Eucalyptus globulus' and 'Acacia mearnsii'en
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorForrester, David Ien
local.search.authorSchortemeyer, Marcusen
local.search.authorStock, William Den
local.search.authorBauhus, Jurgenen
local.search.authorKhanna, Partap Ken
local.search.authorCowie, Annetteen
local.uneassociationUnknownen
local.year.published2007en
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