The objective of this project is to quantify seasonal patterns of carbon fluxes (CO2 and CH4) in two dominant marsh types in the Florida Everglades: short- and long- hydroperiod Everglades marshes. The Taylor Slough (short-hydroperiod) and Shark River Slough (long-hydroperiod) exhibit major hydrogeomorphological variations that lead to measurable differences in species form and composition, productivity, nutrient availability, and ecosystem sensitivity to climate. The strong spatial and temporal gradient in water flow has formed a unique network of subtropical freshwater and coastal wetland ecosystems and provides a unique opportunity to examine ecosystem function with differing hydroperiods while still experiencing similar climate.
Freshwater marsh ecosystems in Taylor Slough are subject to a greater range of water level change, which has led to the development of marl substrate and sparse sawgrass communities. Unlike the short-hydroperiods observed in Taylor Slough, Shark River Slough typically remains inundated with moisture throughout the year, except in years with below average precipitation. The northern part of Shark River Slough is dominated by sawgrass peat marsh that transitions to a brackish marsh with a mixture of sparse sawgrass and dwarf mangroves, and then to a saltwater coastal mangrove forest. The Everglades mangrove ecotone lies at the interface of land (i.e., freshwater marsh) and sea and has been one of the areas most impacted by changes in freshwater flows.
This project combines whole-system estimates of net carbon exchange, remote sensing data, and simulation modeling to quantify the drivers of wetland ecosystem carbon dynamics. The Eddy Covariance technique is being used to estimate net carbon exchange.
Schedlbauer, J.L., Oberbauer, S.F., Starr, G., & Jimenez, K.L. 2010. Seasonal differences in the CO2 exchange of a short-hydroperiod Florida Everglades marsh. Agricultural and Forest Meteorology, 150:7-8, 994-1006, doi:10.1016/j.agrformet.2010.03.005.
Schedlbauer, J.L., Oberbauer, S.F., Starr, G., & Jimenez, K.L. 2011. Controls on sensible heat and latent energy fluxes from a short-hydroperiod Florida Everglades marsh. Hydrology, 411, 331-341, doi:10.1016/j.jhydrol.2011.10.014.
Schedlbauer, J.L., Munyon, J.W., Oberbauer, S.F., Gaiser, E.E., & Starr, G. 2012. Controls on ecosystem carbon dioxide exchange in short- and long-hydroperiod Florida Everglades freshwater marshes. Wetlands, doi:10.1007/s13157-012-0311-y.
Malone, Sparkle. 2014. Hydrology drives Everglades ecosystem function: Implications for ecosystem vulnerability to drought, energy balance, climate teleconnections, and climate change. (Dissertation) University of Alabama. Available upon request.
Malone, S.L., Staudhammer, C.L., Oberbauer, S.F., Olivas, P., Ryan, M.G., Schedlbauer, J., Loescher, H.W., & Starr, G. 2014. El Niño Southern Oscillation (ENSO) amplifies precipitation extremes, enhancing CO2 exchange rates in freshwater marsh ecosystems in the Florida Everglades. PlosOne, 9(12): e115058. doi:10.1371/journal.pone.0115058.
Malone, S.L., Keough, C., Staudhammer, C.L., Ryan, M.G., Parton, W.J., Oberbauer, S.F., Olivas, P., Schedlbauer, J., Starr, G. (In review). Ecosystem persistence in the face of climate change: A case study from the freshwater marshes of the Florida Everglades.