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dc.contributorVirginia Tech
dc.contributor.authorNilsen, E. T.
dc.contributor.authorLei, T. T.
dc.contributor.authorSemones, S. W.
dc.date.accessioned2014-06-27T14:45:38Z
dc.date.available2014-06-27T14:45:38Z
dc.date.issued2009-07
dc.identifier.citationE. T. Nilsen, T. T. Lei, and S. W. Semones. "Presence of Understory Shrubs Constrains Carbon Gain in Sunflecks by Advance_Regeneration Seedlings: Evidence from Quercus rubra Seedlings Growing in Understory Forest Patches with or without Evergreen Shrubs Present," International Journal of Plant Sciences, Vol. 170, No. 6 (July/August 2009), pp. 735-747. DOI: 10.1086/599240
dc.identifier.issn1058-5893
dc.identifier.urihttp://hdl.handle.net/10919/49133
dc.description.abstractWe investigated whether dynamic photosynthesis of understory Quercus rubra L. (Fagaceae) seedlings can acclimate to the altered pattern of sunflecks in forest patches with Rhododendron maximum L. (Ericaceae), an understory evergreen shrub. Maximum photosynthesis (A) and total CO(2) accumulated during lightflecks was greatest for 400-s lightflecks, intermediate for 150-s lightflecks, and lowest for 50- and 75-s lightflecks. For the 400-s lightflecks only, maximum A and total CO(2) accumulated were significantly lower for seedlings in forest patches with shrubs present (SF) than for seedlings in forest patches without shrubs (F). These effects were found only when A was calculated on a leaf-area basis because the specific leaf area of seedlings in F patches was 16% lower than it was for seedlings in SF patches. Photosynthesis reached 50% induction in 159 s for seedlings in F patches compared with 226 s for seedlings in SF patches. The faster induction of A for seedlings in F patches resulted in a significantly higher lightfleck use efficiency than for seedlings in SF patches. The inefficient use of lightflecks by Q. rubra seedlings in SF patches may be a primary mechanism by which Q. rubra seedlings are inhibited by subcanopy thickets of R. maximum.
dc.description.sponsorshipUSDA Forest/Range/Crop/Wetland Ecosystems 95-37101-1902
dc.language.isoen_US
dc.publisherUniversity of Chicago Press
dc.subjectdynamic photosynthesis
dc.subjectsunfleck responses
dc.subjecttransient light
dc.subjectadvance
dc.subjectregeneration
dc.subjectdeciduous forest
dc.subjectquercus rubra
dc.subjectrhododendron maximum
dc.subjectrhododendron-maximum thickets
dc.subjectappalachian hardwood forests
dc.subjecttemperate
dc.subjectdeciduous forest
dc.subjectcoastal british-columbia
dc.subjectcanopy-tree seedlings
dc.subjecttropical rain-forest
dc.subjectsouthern new-england
dc.subjectphotosynthetic responses
dc.subjectlight environments
dc.subjectshade-tolerant
dc.subjectplant sciences
dc.titlePresence of understory shrubs constrains carbon gain in sunflecks by advance-regeneration seedlings: evidence from quercus rubra seedlings growing in understory forest patches with or without evergreen shrubs present
dc.typeArticle - Refereed
dc.identifier.urlhttp://www.jstor.org/stable/10.1086/599240
dc.date.accessed2014-06-26
dc.title.serialInternational Journal of Plant Sciences
dc.identifier.doihttps://doi.org/10.1086/599240


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