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

Jimenez, Kristine L.; Starr, Gregory; Staudhammer, Christina L.; Schedlbauer, Jessica L.; Loescher, Henry W.; Malone, Sparkle L.; Oberbauer, S. F.

doi:10.1029/2012jg002117

Cited by 78 publications

(103 citation statements)

References 113 publications

(110 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…DAYCENT weakly captured fluctuations in v www.esajournals.org daily CO 2 exchange rates, though monthly estimates were very similar to those observed and previously reported for NEE, R eco and GEE at TS and SRS for 2008 to 2009 (Jimenez et al 2012). Atmospheric convention is used for CO 2 exchange rates, where a positive value denotes a loss of C from the ecosystem.…”

Section: Daycent Validationsupporting

confidence: 69%

“…v www.esajournals.org sink, source, or near neutral annually (Jimenez et al 2012, Malone et al 2014b, rising CO 2 concentration may cause an enhancement in the sink potential of Everglades freshwater marsh ecosystems by improving resource use efficiencies, though the response to CO 2 enrichment will be limited by low P levels.…”

Section: Main and Interactive Effects Of Multifactor Climate Changementioning

confidence: 99%

“…Observed soil temperature (T soil , 8C) was measured at 5 cm depths at two locations within each site using insulated thermocouples (Type-T, Omega Engineering, Stamford, CT). Observed VWC, T soil and CO 2 exchange rates (NEE, R eco , and GEE) were obtained from the eddy covariance tower sites at TS (TS-1b) (Schedlbauer et al 2010, Schedlbauer et al 2011, Jimenez et al 2012) and SRS (SRS-2) (Jimenez et al 2012). All observed data is available through AmeriFlux (http://ameriflux.…”

Section: Daycent Validationmentioning

confidence: 99%

“…The irrigation option keeps soils saturated, which influences soil oxygen levels, but does not include the effects of standing water on exposed leaf area. To incorporate the effects of standing water on the productivity of emergent vegetation (Jimenez et al 2012), we adjusted the optimum and maximum temperatures for production and altered the coefficients used to calculate water stress on vegetation production. We matched historical seasonal water levels at each site; at TS, the system was inundated throughout the wet season, while SRS remained inundated during the entire year.…”

Section: Daycent Parameterizationmentioning

confidence: 99%

See 3 more Smart Citations

Ecosystem resistance in the face of climate change: a case study from the freshwater marshes of the Florida Everglades

et al. 2015

View full text Add to dashboard Cite

Abstract. Shaped by the hydrology of the Kissimmee-Okeechobee-Everglades watershed, the Florida Everglades is composed of a conglomerate of wetland ecosystems that have varying capacities to sequester and store carbon. Hydrology, which is a product of the region's precipitation and temperature patterns combined with water management policy, drives community composition and productivity. As shifts in both precipitation and air temperature are expected over the next 100 years as a consequence of climate change, CO 2 dynamics in the greater Everglades are expected to change. To reduce uncertainties associated with climate change and to explore how projected changes in atmospheric CO 2 concentration and climate can alter current CO 2 exchange rates in Everglades freshwater marsh ecosystems, we simulated fluxes of carbon among the atmosphere, vegetation, and soil using the DAYCENT model. We explored the effects of low, moderate, and high scenarios for atmospheric CO 2 (550, 850, and 950 ppm), mean annual air temperature (þ1, þ2.5, and þ4.28C) and precipitation (À2, þ7, and þ14%), as predicted by the IPCC for the year 2100 for the region, on CO 2 exchange rates in short-and long-hydroperiod wetland ecosystems. Under 100 years of current climate and atmospheric CO 2 concentration, Everglades freshwater marsh ecosystems were estimated to be CO 2 -neutral. As atmospheric CO 2 concentration increased and under climate change projections, there were slight shifts in the start and length of the wet season (À1 to þ7 days) and a small enhancement in the sink capacity (by À169 to À573 g C m À2 century À1 ) occurred at both short-and longhydroperiod ecosystems compared to CO 2 dynamics under the current climate regime. Over 100 years, rising temperatures increased net CO 2 exchange rates (þ1 to 13 g C m À2 century À1) and shifts in precipitation patterns altered cumulative net carbon uptake by þ13 to À46 g C m À2 century À1. While changes in ecosystem structure, species composition, and disturbance regimes were beyond the scope of this research, results do indicate that climate change will produce small changes in CO 2 dynamics in Everglades freshwater marsh ecosystems and suggest that the hydrologic regime and oligotrophic conditions of Everglades freshwater marshes lowers the ecosystem sensitivity to climate change.

show abstract

Section: Daycent Validationsupporting

confidence: 69%

Section: Main and Interactive Effects Of Multifactor Climate Changementioning

confidence: 99%

Section: Daycent Validationmentioning

confidence: 99%

Section: Daycent Parameterizationmentioning

confidence: 99%

See 2 more Smart Citations

Ecosystem resistance in the face of climate change: a case study from the freshwater marshes of the Florida Everglades

et al. 2015

View full text Add to dashboard Cite

show abstract

“…For example, Jimenez et al (2012) and Schedlbauer et al (2010) indicate that additional deliveries of water into peat and marl sawgrass wetlands may diminish C accumulation within these wetlands. Eddy-covariance-derived estimates of net ecosystem productivity declined with increasing inundation during the wet season (Jimenez et al, 2012;Schedlbauer et al, 2010). These results were partially attributed to the amount of vegetation that, due to flooding, could not directly exchange carbon dioxide with the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Carbon exchange between the atmosphere and subtropical forested cypress and pine wetlands

Shoemaker

Anderson

Barr³

et al. 2015

Biogeosciences

View full text Add to dashboard Cite

Abstract. Carbon dioxide exchange between the atmosphere and forested subtropical wetlands is largely unknown. Here we report a first step in characterizing this atmospheric–ecosystem carbon (C) exchange, for cypress strands and pine forests in the Greater Everglades of Florida as measured with eddy covariance methods at three locations (Cypress Swamp, Dwarf Cypress and Pine Upland) for 2 years. Links between water and C cycles are also examined at these three sites, as are methane emission measured only at the Dwarf Cypress site. Each forested wetland showed net C uptake from the atmosphere both monthly and annually, as indicated by the net ecosystem exchange (NEE) of carbon dioxide (CO2). For this study, NEE is the difference between photosynthesis and respiration, with negative values representing uptake from the atmosphere that is retained in the ecosystem or transported laterally via overland flow (unmeasured for this study). Atmospheric C uptake (NEE) was greatest at the Cypress Swampp (−900 to −1000 g C m2 yr−1), moderate at the Pine Upland (−650 to −700 g C m2 yr−1) and least at the Dwarf Cypress (−400 to −450 g C m2 yr−1). Changes in NEE were clearly a function of seasonality in solar insolation, air temperature and flooding, which suppressed heterotrophic soil respiration. We also note that changes in the satellite-derived enhanced vegetation index (EVI) served as a useful surrogate for changes in NEE at these forested wetland sites.

show abstract

Carbon dioxide and methane emissions from an artificially drained coastal wetland during a flood: Implications for wetland global warming potential

Gatland

Santos

Maher

et al. 2014

J. Geophys. Res. Biogeosci.

View full text Add to dashboard Cite

Floods frequently produce deoxygenation and acidification in waters of artificially drained coastal acid sulfate soil (CASS) wetlands. These conditions are ideal for carbon dioxide and methane production. We investigated CO 2 and CH 4 dynamics and quantified carbon loss within an artificially drained CASS wetland during and after a flood. We separated the system into wetland soils (inundated soil during flood and exposed soil during post flood period), drain water, and creek water and performed measurements of free CO 2 ([CO 2 *]), CH 4 , dissolved inorganic and organic carbon (DIC and DOC), stable carbon isotopes, and radon ( 222 Rn: natural tracer for groundwater discharge) to determine aquatic carbon loss pathways. [CO 2 *] and CH 4 values in the creek reached 721 and 81 μM, respectively, 2 weeks following a flood during a severe deoxygenation phase (dissolved oxygen~0% saturation). CO 2 and CH 4 emissions from the floodplain to the atmosphere were 17-fold and 170-fold higher during the flooded period compared to the post-flood period, respectively. CO 2 emissions accounted for about 90% of total floodplain mass carbon losses during both the flooded and post-flood periods. Assuming a 20 and 100 year global warming potential (GWP) for CH 4 of 105 and 27 CO 2 -equivalents, CH 4 emission contributed to 85% and 60% of total floodplain CO 2-equivalent emissions, respectively. Stable carbon isotopes (δ 13 C in dissolved CO 2 and CH 4 ) and 222 Rn indicated that carbon dynamics within the creek were more likely driven by drainage of surface floodwaters from the CASS wetland rather than groundwater seepage. This study demonstrated that >90% of CO 2 and CH 4 emissions from the wetland system occurred during the flood period and that the inundated wetland was responsible for~95% of CO 2 -equivalent emissions over the floodplain.

show abstract

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

Cited by 78 publications

References 113 publications

Ecosystem resistance in the face of climate change: a case study from the freshwater marshes of the Florida Everglades

Ecosystem resistance in the face of climate change: a case study from the freshwater marshes of the Florida Everglades

Carbon exchange between the atmosphere and subtropical forested cypress and pine wetlands

Carbon dioxide and methane emissions from an artificially drained coastal wetland during a flood: Implications for wetland global warming potential

Contact Info

Product

Resources

About