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dc.contributor.advisorWilliams, Daveen_US
dc.contributor.authorPedicino, Lisa Christine, 1973-
dc.creatorPedicino, Lisa Christine, 1973-en_US
dc.date.accessioned2013-05-16T09:34:07Z
dc.date.available2013-05-16T09:34:07Z
dc.date.issued1997en_US
dc.identifier.urihttp://hdl.handle.net/10150/291639
dc.description.abstractSince industrialization atmospheric CO₂ concentrations have increased from 280 to 365 ppmv and δ¹³Cₐᵢᵣ has decreased from -6.5 to -8.2‰. These two trends have consequences for plant physiology. I examine δ¹³C plant and physiological parameters in herbarium specimens of Atriplex confertifolia, Atriplex canescens, Ephedra viridis, Pinus edulis, Pinus flexilis , Juniperus scopulorum, and Quercus turbinella. For all species, I found relatively high and unsystematic variability. δ¹³C values for A. confertifolia and A. canescens varied by up to 7.9 and 9.5‰ respectively; δ¹³C values of these C₄ shrubs are unsuitable for reconstructing δ¹³Cₐᵢᵣ, as previously claimed. δ¹³C(plant) generally becomes more depleted except in P. edulis. Other calculated parameters such as Δ, Cᵢ/Cₐ, Cᵢ, and A/g have varying responses even among similar functional groups. Because much of the isotopic variability caused by interplant, intertree, intersite, and interannual differences is implicit, herbarium specimens are inadequate for precise detection of direct CO₂ effects on plant physiology.
dc.language.isoen_USen_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.subjectEnvironmental Sciences.en_US
dc.subjectBiogeochemistry.en_US
dc.subjectEnvironmental Sciences.en_US
dc.titleCarbon isotopic variations in 7 southwestern United States plants from herbarium collections of the last 150 yearsen_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
thesis.degree.grantorUniversity of Arizonaen_US
thesis.degree.levelmastersen_US
dc.identifier.proquest1387715en_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineRenewable Natural Resourcesen_US
thesis.degree.nameM.S.en_US
dc.identifier.bibrecord.b37744586en_US
refterms.dateFOA2018-06-17T04:29:00Z
html.description.abstractSince industrialization atmospheric CO₂ concentrations have increased from 280 to 365 ppmv and δ¹³Cₐᵢᵣ has decreased from -6.5 to -8.2‰. These two trends have consequences for plant physiology. I examine δ¹³C plant and physiological parameters in herbarium specimens of Atriplex confertifolia, Atriplex canescens, Ephedra viridis, Pinus edulis, Pinus flexilis , Juniperus scopulorum, and Quercus turbinella. For all species, I found relatively high and unsystematic variability. δ¹³C values for A. confertifolia and A. canescens varied by up to 7.9 and 9.5‰ respectively; δ¹³C values of these C₄ shrubs are unsuitable for reconstructing δ¹³Cₐᵢᵣ, as previously claimed. δ¹³C(plant) generally becomes more depleted except in P. edulis. Other calculated parameters such as Δ, Cᵢ/Cₐ, Cᵢ, and A/g have varying responses even among similar functional groups. Because much of the isotopic variability caused by interplant, intertree, intersite, and interannual differences is implicit, herbarium specimens are inadequate for precise detection of direct CO₂ effects on plant physiology.


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