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

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dc.contributor.author Jimenez, K. L.
dc.contributor.author Staudhammer, Christina L.
dc.contributor.author Schedlbauer, J. L.
dc.contributor.author Loescher, H. W.
dc.contributor.author Malone, S. L.
dc.contributor.author Oberbauer, S. F.
dc.contributor.author Starr, G.
dc.coverage.spatial Everglades (Fla.) en_US
dc.date.accessioned 2018-11-30T20:44:54Z
dc.date.available 2018-11-30T20:44:54Z
dc.identifier.citation Jimenez, 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 en_US
dc.identifier.uri http://ir.ua.edu/handle/123456789/5123
dc.description.abstract Everglades 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 (Reco) versus air temperature, and Reco 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.mimetype application/pdf en_US
dc.subject CO2 fluxes en_US
dc.subject Everglades National Park en_US
dc.subject ecosystem respiration (Reco) en_US
dc.subject freshwater marshes en_US
dc.subject hydroperiod en_US
dc.subject net ecosystem exchange (NEE) en_US
dc.title Carbon dioxide exchange rates from short- and long-hydroperiod Everglades freshwater marsh en_US
dc.type text en_US


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