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dc.contributor.authorZak, Donald R.en_US
dc.contributor.authorPregitzer, Kurt S.en_US
dc.contributor.authorRothstein, David E.en_US
dc.date.accessioned2006-09-11T19:17:14Z
dc.date.available2006-09-11T19:17:14Z
dc.date.issued1996-10en_US
dc.identifier.citationRothstein, David E.; Zak, Donald R.; Pregitzer, Kurt S.; (1996). "Nitrate deposition in northern hardwood forests and the nitrogen metabolism of Acer saccharum marsh." Oecologia 108(2): 338-344. <http://hdl.handle.net/2027.42/47695>en_US
dc.identifier.issn0029-8549en_US
dc.identifier.issn1432-1939en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/47695
dc.description.abstractIt is generally assumed that plant assimilation constitutes the major sink for anthropogenic Nitrate NO 3 − deposited in temperate forests because plant growth is usually limited by nitrogen (N) availability. Nevertheless, plants are known to vary widely in their capacity for NO 3 − uptake and assimilation, and few studies have directly measured these parameters for overstory trees. Using a combination of field and greenhouse experiments, we studied the N nutrition of Acer saccharum Marsh. in four northern hardwood forests receiving experimental NO 3 − additions equivalent to 30 kg N ha −1 year −1 . We measured leaf and fine-root nitrate reductase activity (NRA) of overstory trees using an in vivo assay and used 15 N to determine the kinetic parameters of NO 3 − uptake by excised fine roots. In two greenhouse experiments, we measured leaf and root NRA in A. saccharum seedlings fertilized with 0–3.5 g NO 3 − −N m −2 and determined the kinetic parameters of NO 3 − and NH 4 + uptake in excised roots of seedlings. In both overstory trees and seedlings, rates of leaf and fine root NRA were substantially lower than previously reported rates for most woody plants and showed no response to NO 3 − fertilization (range = non-detectable to 33 nmol NO 2 − g −1 h −1 ). Maximal rates of NO 3 − uptake in overstory trees also were low, ranging from 0.2 to 1.0 μmol g −1 h −1 . In seedlings, the mean V max for NO 3 − uptake in fine roots (1 μmol g −1 h −1 ) was approximately 30 times lower than the V max for NH 4 + uptake (33 μmol g −1 h −1 ). Our results suggest that A. saccharum satisfies its N demand through rapid NH 4 + uptake and may have a limited capacity to serve as a direct sink for atmospheric additions of NO 3 − .en_US
dc.format.extent824787 bytes
dc.format.extent3115 bytes
dc.format.mimetypeapplication/pdf
dc.format.mimetypetext/plain
dc.language.isoen_US
dc.publisherSpringer-Verlagen_US
dc.subject.otherAcer Saccharumen_US
dc.subject.otherPlant Sciencesen_US
dc.subject.otherEcologyen_US
dc.subject.otherNitrogen Uptakeen_US
dc.subject.otherNitrogen Depositionen_US
dc.subject.otherLife Sciencesen_US
dc.subject.other15 Nen_US
dc.subject.otherNitrate Reductaseen_US
dc.titleNitrate deposition in northern hardwood forests and the nitrogen metabolism of Acer saccharum marshen_US
dc.typeArticleen_US
dc.subject.hlbsecondlevelNatural Resources and Environmenten_US
dc.subject.hlbsecondlevelMolecular, Cellular and Developmental Biologyen_US
dc.subject.hlbsecondlevelEcology and Evolutionary Biologyen_US
dc.subject.hlbtoplevelHealth Sciencesen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumSchool of Natural Resources and Environment, University of Michigan, 48109, Ann Arbor, MI, USAen_US
dc.contributor.affiliationumSchool of Natural Resources and Environment, University of Michigan, 48109, Ann Arbor, MI, USAen_US
dc.contributor.affiliationotherSchool of Forestry, Michigan Technological University, 49931, Houghton, MI, USA; Lake Superior Ecosystems Research Center, Michigan Technological University, 49931, Houghton, MI, USAen_US
dc.contributor.affiliationumcampusAnn Arboren_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/47695/1/442_2004_Article_BF00334659.pdfen_US
dc.identifier.doihttp://dx.doi.org/10.1007/BF00334659en_US
dc.identifier.sourceOecologiaen_US
dc.owningcollnameInterdisciplinary and Peer-Reviewed


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