Carbon dioxide exchange rates from short- and long-hydroperiod Everglades freshwater marsh

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dc.contributor.authorJimenez, K. L.
dc.contributor.authorStarr, G.
dc.contributor.authorStaudhammer, C. L.
dc.contributor.authorSchedlbauer, J. L.
dc.contributor.authorLoescher, H. W.
dc.contributor.authorMalone, S. L.
dc.contributor.authorOberbauer, S. F.
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.contributor.otherState University System of Florida
dc.contributor.otherFlorida International University
dc.contributor.otherPennsylvania State System of Higher Education (PASSHE)
dc.contributor.otherWest Chester University of Pennsylvania
dc.contributor.otherUniversity of Colorado System
dc.contributor.otherUniversity of Colorado Boulder
dc.contributor.otherUnited States Department of Agriculture (USDA)
dc.contributor.otherUnited States Forest Service
dc.coverage.spatialEverglades (Fla.)
dc.date.accessioned2018-11-30T20:44:54Z
dc.date.available2018-11-30T20:44:54Z
dc.description.abstractEverglades freshwater marshes were once carbon sinks, but human-driven hydrologic changes have led to uncertainty about the current state of their carbon dynamics. To investigate the effect of hydrology on CO2 exchange, we used eddy covariance measurements for 2 years (2008-2009) in marl (short-hydroperiod) and peat (long-hydroperiod) wetlands in Everglades National Park. The importance of site, season, and environmental drivers was evaluated using linear and nonlinear modeling, and a novel method was used to test for temporally lagged patterns in the data. Unexpectedly, the long-hydroperiod peat marsh was a small CO2 source (19.9 g C m(-2) from July to December 2008 and 80.0 g C m(-2) in 2009), and at no time over the study period was it a strong sink. Contrary to previous research suggesting high productivity rates from a short-hydroperiod marsh, we estimated that the marl site was a small CO2 sink in 2008 (net ecosystem exchange [NEE] = -78.8 g C m(-2)) and was near neutral for carbon balance in 2009. In addition, both sites had relatively low gross ecosystem exchange (GEE) over the 2 years of this study. The two sites showed similar responses for NEE versus air temperature, ecosystem respiration (R-eco) versus air temperature, and R-eco versus water depth, although the magnitude of the responses differed. We saw small lags (30 min in most cases) between carbon fluxes and environmental drivers. This study is foundational for understanding the carbon balance of these ecosystems prior to implementation of the planned Everglades restoration of historical water flow that will likely alter the future trajectory of the carbon dynamics of the Everglades as a whole.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationJimenez, K. et al. (2012): Carbon dioxide exchange rates from short- and long-hydroperiod Everglades freshwater marsh. Journal of Geophysical Research, 117. DOI: 10.1029/2012JG002117
dc.identifier.doi10.1029/2012JG002117
dc.identifier.orcidhttps://orcid.org/0000-0001-9034-1076
dc.identifier.urihttp://ir.ua.edu/handle/123456789/5123
dc.languageEnglish
dc.language.isoen_US
dc.publisherAmerican Geophysical Union
dc.subjectECOSYSTEM CO2 EXCHANGE
dc.subjectENVIRONMENTAL CONTROLS
dc.subjectFLORIDA EVERGLADES
dc.subjectWETLAND
dc.subjectFLUXES
dc.subjectRESPONSES
dc.subjectPRODUCTIVITY
dc.subjectRESPIRATION
dc.subjectTEMPERATURE
dc.subjectEMISSIONS
dc.subjectEnvironmental Sciences
dc.subjectGeosciences, Multidisciplinary
dc.subjectEnvironmental Sciences & Ecology
dc.subjectGeology
dc.titleCarbon dioxide exchange rates from short- and long-hydroperiod Everglades freshwater marshen_US
dc.typetext
dc.typeArticle
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