Environmental And Stand Variables Influencing Soil CO2 Efflux Across The Managed Range Of Loblolly Pine

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dc.contributor.authorTempleton, Benjamin Seanen
dc.contributor.committeechairSeiler, John R.en
dc.contributor.committeememberWynne, Randolph H.en
dc.contributor.committeememberJones, Robert H.en
dc.contributor.committeememberFox, Thomas R.en
dc.contributor.departmentForestryen
dc.date.accessioned2014-03-14T20:32:48Zen
dc.date.adate2009-04-10en
dc.date.available2014-03-14T20:32:48Zen
dc.date.issued2009-02-03en
dc.date.rdate2009-04-10en
dc.date.sdate2009-03-23en
dc.description.abstractManaged loblolly pine forests comprise an important pool in the global carbon cycle. Understanding the influences upon inputs and outputs of this pool, including the effects of management activities, will allow landowners to understand how carbon can be sequestered in their stands. Specific to this study, we sought to create multivariate models of the output of carbon from the soil in the form of soil CO2 efflux (Rs) and a component of that total efflux, heterotrophic respiration index (Rh), from data collected across the managed range of loblolly pine in the Southeastern U.S. We also performed tests of significance on controlled subsets of these data for the effects of fertilization and of thinning. Finally, we sought a connection between stand leaf area index (LAI) and total soil CO2 efflux or heterotrophic respiration. Our models indicated variability in both Rs and Rh across latitude and physiographic province, respectively, within this range. The Rs (R2 = 0.56) model included temperature, latitude, a soil moisture by temperature effect, soil nitrogen, and bulk density variables. The Rh (R2 = 0.50) model included soil moisture, a temperature by moisture interaction, and physiographic province. Rs was not significantly affected by either fertilization or thinning, yet Rh was influenced by both (negatively and positively, respectively). This indicates a shift in relative contributions of heterotrophic respiration and root respiration components to Rs in response to these treatments. Heterotrophic respiration was shown to have a weak negative response (R2 = 0.04) to increasing stand LAI.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-03232009-092544en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-03232009-092544/en
dc.identifier.urihttp://hdl.handle.net/10919/31529en
dc.publisherVirginia Techen
dc.relation.haspartTempleton_THESIS.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectCarbon Cycleen
dc.subjectCarbon Sequestrationen
dc.subjectSoil Respirationen
dc.subjectRegion Wideen
dc.subjectPinus taedaen
dc.titleEnvironmental And Stand Variables Influencing Soil CO2 Efflux Across The Managed Range Of Loblolly Pineen
dc.typeThesisen
thesis.degree.disciplineForestryen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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