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

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dc.contributor.authorNilsen, Erik T.en
dc.contributor.authorLei, T. T.en
dc.contributor.authorSemones, S. W.en
dc.contributor.departmentBiological Sciencesen
dc.date.accessed2014-06-26en
dc.date.accessioned2014-06-27T14:45:38Zen
dc.date.available2014-06-27T14:45:38Zen
dc.date.issued2009-07en
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.en
dc.description.sponsorshipUSDA Forest/Range/Crop/Wetland Ecosystems 95-37101-1902en
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: 10.1086/599240en
dc.identifier.doihttps://doi.org/10.1086/599240en
dc.identifier.issn1058-5893en
dc.identifier.urihttp://hdl.handle.net/10919/49133en
dc.identifier.urlhttp://www.jstor.org/stable/10.1086/599240en
dc.language.isoen_USen
dc.publisherUniversity of Chicago Pressen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectdynamic photosynthesisen
dc.subjectsunfleck responsesen
dc.subjecttransient lighten
dc.subjectadvanceen
dc.subjectregenerationen
dc.subjectdeciduous foresten
dc.subjectquercus rubraen
dc.subjectrhododendron maximumen
dc.subjectrhododendron-maximum thicketsen
dc.subjectappalachian hardwood forestsen
dc.subjecttemperateen
dc.subjectdeciduous foresten
dc.subjectcoastal british-columbiaen
dc.subjectcanopy-tree seedlingsen
dc.subjecttropical rain-foresten
dc.subjectsouthern new-englanden
dc.subjectphotosynthetic responsesen
dc.subjectlight environmentsen
dc.subjectshade-toleranten
dc.subjectplant sciencesen
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 presenten
dc.title.serialInternational Journal of Plant Sciencesen
dc.typeArticle - Refereeden

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