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dc.contributor.authorTierney, Julie Anne
dc.date.accessioned2018-03-21T04:30:15Z
dc.date.available2018-03-21T04:30:15Z
dc.date.issued2017-08
dc.identifier.othertierney_julie_a_201708_ms
dc.identifier.urihttp://purl.galileo.usg.edu/uga_etd/tierney_julie_a_201708_ms
dc.identifier.urihttp://hdl.handle.net/10724/37508
dc.description.abstractBiological nitrogen fixation (BNF) can alleviate nitrogen (N) deficiencies that inhibit ecosystem recovery, yet how BNF achieves this under frequent fire disturbance is unclear. We investigated BNF’s capacity to provide N to restored longleaf pine savannas, how it is organized and regulated over time, and how it responds to fire. We conducted this study in 54 1-ha plots of longleaf pine across gradients of stand age and fire frequency at two sites in the southeastern US. We determined BNF by three functional groups of N-fixers (legumes, soil crusts, and asymbiotic bacteria), and quantified components of the N cycle. We found that BNF was maintained over time, and fire enhanced BNF from legumes. Despite this, BNF was insufficient to balance N losses from fire. Unexpectedly, differences between the two sites described the most variation in BNF, highlighting that landscape-level drivers can have dramatic influences on BNF.
dc.languageeng
dc.publisheruga
dc.rightspublic
dc.subjectNitrogen fixation
dc.subjectDisturbance
dc.subjectFire
dc.subjectEcosystem recovery
dc.subjectLongleaf pine savannas
dc.titleBiological nitrogen fixation dynamics during ecosystem recovery in longleaf pine savannas
dc.typeThesis
dc.description.degreeMS
dc.description.departmentInstitute of Ecology
dc.description.majorEcology
dc.description.advisorNina Wurzburger
dc.description.committeeNina Wurzburger
dc.description.committeeJoseph O'Brien
dc.description.committeeMiguel Cabrera


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