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dc.contributor.authorSefcik, Lesley
dc.contributor.authorZak, D.R.
dc.contributor.authorEllsworth, D.S.
dc.date.accessioned2020-02-13T05:26:43Z
dc.date.available2020-02-13T05:26:43Z
dc.date.issued2007
dc.identifier.citationSefcik, L.T. and Zak, D.R. and Ellsworth, D.S. 2007. Seedling survival in a northern temperate forest understory in increased by elevated atmospheric carbon dioxide and atmospheric nitrogen deposition. Global Change Biology. 13 (1): pp. 132-146.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/77907
dc.identifier.doi10.1111/j.1365-2486.2006.01293.x
dc.description.abstract

We tested the main and interactive effects of elevated carbon dioxide concentration ([CO2]), nitrogen (N), and light availability on leaf photosynthesis, and plant growth and survival in understory seedlings grown in an N‐limited northern hardwood forest. For two growing seasons, we exposed six species of tree seedlings (Betula papyrifera, Populus tremuloides, Acer saccharum, Fagus grandifolia, Pinus strobus, and Prunus serotina) to a factorial combination of atmospheric CO2 (ambient, and elevated CO2 at 658 μmol CO2 mol−1) and N deposition (ambient and ambient +30 kg N ha−1 yr−1) in open‐top chambers placed in an understory light gradient. Elevated CO2 exposure significantly increased apparent quantum efficiency of electron transport by 41% (P<0.0001), light‐limited photosynthesis by 47% (P<0.0001), and light‐saturated photosynthesis by 60% (P<0.003) compared with seedlings grown in ambient [CO2]. Experimental N deposition significantly increased light‐limited photosynthesis as light availability increased (P<0.037). Species differed in the magnitude of light‐saturated photosynthetic response to elevated N and light treatments (P<0.016). Elevated CO2 exposure and high N availability did not affect seedling growth; however, growth increased slightly with light availability (R2=0.26, P<0.0001). Experimental N deposition significantly increased average survival of all species by 48% (P<0.012). However, seedling survival was greatest (85%) under conditions of both high [CO2] and N deposition (P<0.009). Path analysis determined that the greatest predictor for seedling survival in the understory was total biomass (R2=0.39, P<0.001), and that carboxylation capacity (Vcmax) was a better predictor for seedling growth and survival than maximum photosynthetic rate (Amax). Our results suggest that increasing [CO2] and N deposition from fossil fuel combustion could alter understory tree species recruitment dynamics through changes in seedling

dc.languageEnglish
dc.publisherBLACKWELL PUBLISHING
dc.subjectScience & Technology
dc.subjectLife Sciences & Biomedicine
dc.subjectBiodiversity Conservation
dc.subjectEcology
dc.subjectEnvironmental Sciences
dc.subjectBiodiversity & Conservation
dc.subjectEnvironmental Sciences & Ecology
dc.subjectelevated CO2
dc.subjectgrowth
dc.subjectlight-limitation
dc.subjectN-limitation
dc.subjectnitrogen
dc.subjectnorthern hardwood species
dc.subjectpath analysis
dc.subjectphotosynthesis
dc.subjectshade tolerance
dc.subjectsurvival
dc.subjectRELATIVE GROWTH-RATE
dc.subjectPHOTOSYNTHETIC ACCLIMATION
dc.subjectCO2 CONCENTRATION
dc.subjectSHADE-TOLERANCE
dc.subjectPOPULUS-TREMULOIDES
dc.subjectSUCCESSIONAL STATUS
dc.subjectLIGHT AVAILABILITY
dc.subjectLEAF NITROGEN
dc.subjectCHLOROPLAST ULTRASTRUCTURE
dc.subjectCO2-ENRICHED ATMOSPHERE
dc.titleSeedling survival in a northern temperate forest understory in increased by elevated atmospheric carbon dioxide and atmospheric nitrogen deposition
dc.typeJournal Article
dcterms.source.volume13
dcterms.source.number1
dcterms.source.startPage132
dcterms.source.endPage146
dcterms.source.issn1365-2486
dcterms.source.titleGlobal Change Biology
dc.date.updated2020-02-13T05:26:42Z
curtin.departmentOffice of the Academic Registrar
curtin.accessStatusFulltext not available
curtin.facultyOffice of the Academic Registrar
curtin.contributor.orcidSefcik, Lesley [0000-0002-6877-6943]
curtin.contributor.scopusauthoridSefcik, Lesley [57192923946]


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