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Effects of cumulus clouds on microclimate and shoot-level photosynthetic gas exchange in Picea engelmannii and Abies lasiocarpa at treeline, Medicine Bow Mountains, Wyoming, USA

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dc.creatorHughes, Nicole M.spa
dc.creatorCarpenter, Kaylyn L.spa
dc.creatorCook, David K.spa
dc.creatorKeidel, Timothy S.spa
dc.creatorMiller, Charlene N.spa
dc.creatorNeal, Junior L.spa
dc.creatorSánchez Andrade, Adrianaspa
dc.creatorSmith, William K.spa
dc.date.accessioned2020-08-06T16:21:40Z
dc.date.available2020-08-06T16:21:40Z
dc.date.created2015-02-015spa
dc.description.abstractHere we describe the dynamic effects of cumulus clouds on microclimate and shoot-level photosynthetic gas exchange in saplings of two treeline conifer species—Picea engelmannii and Abies lasiocarpa. Measurements were made during both clear-sky and partly cloudy conditions (?10–70% cumulus cloud cover) throughout the 2012 growing season within an alpine-treeline ecotone. Cumulus clouds generated dynamic fluctuations in photosynthetically active radiation (PAR), higher maximum PAR (>2500 ?mol m?2 s?1), 2–4 fold increases in diffuse PAR, reduced daily mean and cumulative PAR, lower needle temperatures, and reduced leaf-to-air vapor pressure differences relative to clear-sky conditions. Onset of cloud-shade corresponded with declines in photosynthesis, needle temperatures, and evapotranspiration, which were proportional to cloud duration and opacity. Despite increased diffuse light and greater sunlight intensity during cloud-gaps, photosynthesis was never higher on partly cloudy days compared to clear days in either species, during cloud-gaps or cloud-shade. However, reduced transpiration paired with photosynthesis comparable with clear-sky levels during cloud-gaps resulted in greater instantaneous water use efficiency relative to clear-sky measurements. There was no apparent photoinhibition of photosynthesis reflected in gas exchange measurements in response to abrupt and dramatic changes in PAR levels caused by cumulus clouds. We conclude that cumulus clouds reduce instantaneous and daily carbon gain, although lower needle temperatures and associated reductions in transpirational water loss may alleviate daily and seasonal water stress, thereby enhancing carbon gain over the growing seasoneng
dc.format.mimetypeapplication/pdf
dc.identifier.doihttps://doi.org/10.1016/j.agrformet.2014.10.012
dc.identifier.issnISSN: 0168-1923
dc.identifier.issnEISSN: 1873-2240
dc.identifier.urihttps://repository.urosario.edu.co/handle/10336/26427
dc.language.isoengspa
dc.publisherElsevierspa
dc.relation.citationEndPage37
dc.relation.citationStartPage26
dc.relation.citationTitleAgricultural and Forest Meteorology, Agricultural Meteorology
dc.relation.citationVolumeVol. 201
dc.relation.ispartofAgricultural and Forest Meteorology, ISSN: 0168-1923;EISSN: 1873-2240, Vol.201 (2015-02-15);pp.26-37spa
dc.relation.urihttps://www.sciencedirect.com/science/article/pii/S0168192314002639?via%3Dihubspa
dc.rights.accesRightsinfo:eu-repo/semantics/restrictedAccess
dc.rights.accesoRestringido (Acceso a grupos específicos)spa
dc.sourceAgricultural and Forest Meteorology, Agricultural Meteorologyspa
dc.source.instnameinstname:Universidad del Rosario
dc.source.reponamereponame:Repositorio Institucional EdocUR
dc.subject.keywordCloud gap effectspa
dc.subject.keywordConifer needle morphologyspa
dc.subject.keywordDiffuse lightspa
dc.subject.keywordPhotosynthesisspa
dc.subject.keywordTreelinespa
dc.titleEffects of cumulus clouds on microclimate and shoot-level photosynthetic gas exchange in Picea engelmannii and Abies lasiocarpa at treeline, Medicine Bow Mountains, Wyoming, USAspa
dc.title.TranslatedTitleEfectos de los cúmulos en el microclima y el intercambio de gases fotosintéticos a nivel de brote en Picea engelmannii y Abies lasiocarpa en la línea de árboles, Medicine Bow Mountains, Wyoming, EE. UU.spa
dc.typearticleeng
dc.type.hasVersioninfo:eu-repo/semantics/publishedVersion
dc.type.spaArtículospa
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