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 |