Physical Sciences and Mathematics Commons^™

Effect Of Water Management On Interannual Variation In Bulk Soil Properties From The Eastern Coastal Everglades, R. M. Chambers, R. L. Hatch, T. M. Russell

FCE LTER Journal Articles

We examined interannual variation in soil properties from wetlands occurring in adjacent drainage basins from the southeastern Everglades. Triplicate 10-cm soil cores were collected, homogenized, and analyzed during the wet season 2006–2010 from five freshwater sawgrass wetland marshes and three estuarine mangrove forests. Soil bulk density from the Taylor Slough basin ranged from 0.15 gm-cm⁻³ to 0.5 gm-cm⁻³, was higher than from the Panhandle basin every year, and generally increased throughout the study period. Organic matter as a percent loss on ignition ranged from 7 % to 12 % from freshwater marshes and from 13 % to …

Seasonal Evapotranspiration Patterns In Mangrove Forests, Jordan G. Barr, Marcia S. Delonge, Jose D. Fuentes

FCE LTER Journal Articles

Diurnal and seasonal controls on water vapor fluxes were investigated in a subtropical mangrove forest in Everglades National Park, Florida. Energy partitioning between sensible and latent heat fluxes was highly variable during the 2004–2005 study period. During the dry season, the mangrove forest behaved akin to a semiarid ecosystem as most of the available energy was partitioned into sensible heat, which gave Bowen ratio values exceeding 1.0 and minimum latent heat fluxes of 5 MJ d1. In contrast, during the wet season the mangrove forest acted as a well-watered, broadleaved deciduous forest, with Bowen ratio values of 0.25 and latent …

Modeling Light Use Efficiency In A Subtropical Mangrove Forest Equipped With Co2 Eddy Covariance °C, Jordan G. Barr

FCE LTER Journal Articles

Despite the importance of mangrove ecosystems in the global carbon budget, the relationships between environmental drivers and carbon dynamics in these forests remain poorly understood. This limited understanding is partly a result of the challenges associated with in situ flux studies. Tower-based CO₂ eddy covariance (EC) systems are installed in only a few mangrove forests worldwide, and the longest EC record from the Florida Everglades contains less than 9 years of observations. A primary goal of the present study was to develop a methodology to estimate canopy-scale photosynthetic light use efficiency in this forest. These tower-based observations represent a …

Summertime Influences Of Tidal Energy Advection On The Surface Energy Balance In A Mangrove Forest, Jordan G. Barr, J. D. Fuentes, M. S. Delonge, T. L. O'Halloran, J. C. Zeiman

FCE LTER Journal Articles

Mangrove forests are ecosystems susceptible to changing water levels and temperatures due to climate change as well as perturbations resulting from tropical storms. Numerical models can be used to project mangrove forest responses to regional and global environmental changes, and the reliability of these models depends on surface energy balance closure. However, for tidal ecosystems, the surface energy balance is complex because the energy transport associated with tidal activity remains poorly understood. This study aimed to quantify impacts of tidal flows on energy dynamics within a mangrove ecosystem. To address the research objective, an intensive 10-day study was conducted in …

Mechanisms Of Bicarbonate Use Influence The Photosynthetic Carbon Dioxide Sensitivity Of Tropical Seagrasses, Justin E. Campbell, James W. Fourqurean

FCE LTER Journal Articles

The photosynthetic bicarbonate () use properties of three widely distributed tropical seagrasses were compared using a series of laboratory experiments. Photosynthetic rates of Thalassia testudinum, Halodule wrightii, and Syringodium filiforme were monitored in an enclosed chamber while being subjected to shifts in pH and dissolved inorganic carbon. Specific mechanisms of seagrass use were compared by examining the photosynthetic effects of the carbonic anhydrase inhibitor acetazolamide (AZ). All seagrasses increased photosynthetic rates with reduced pH, suggesting a large effect of dissolved aqueous carbon dioxide (CO_2(aq)). However, there was considerable interspecific variation in pH response. T. testudinum was …

Controls On Ecosystem Carbon Dioxide Exchange In Short- And Long-Hydroperiod Florida Everglades Freshwater Marshes, Jessica L. Schedlbauer, Jay W. Munyon, Steven F. Oberbauer, Evelyn E. Gaiser, Gregory Starr

FCE LTER Journal Articles

Although freshwater wetlands are among the most productive ecosystems on Earth, little is known of carbon dioxide (CO₂) exchange in low latitude wetlands. The Everglades is an extensive, oligotrophic wetland in south Florida characterized by short- and long-hydroperiod marshes. Chamber-based CO₂ exchange measurements were made to compare the marshes and examine the roles of primary producers, seasonality, and environmental drivers in determining exchange rates. Low rates of CO₂ exchange were observed in both marshes with net ecosystem production reaching maxima of 3.77 and 4.28 μmol CO₂ m⁻² s⁻¹ in short- and long-hydroperiod marshes, …

Survival And Growth Responses Of Eight Everglades Tree Species Along An Experimental Hydrological Gradient On Two Tree Island Types, Susana L. Stoffella, Michael S. Ross, Jay P. Sah, René M. Price, Pamela L. Sullivan, Eric A. Cline, Leonard J. Scinto

FCE LTER Journal Articles

Questions: How are the early survival and growth of seedlings of Everglades tree species planted in an experimental setting on artificial tree islands affected by hydrology and substrate type? What are the implications of these responses for broader tree island restoration efforts?

Location: Loxahatchee Impoundment Landscape Assessment (LILA), Boynton Beach, Florida, USA.

Methods: An experiment was designed to test hydrological and substrate effects on seedling growth and survivorship. Two islands – a peat and a limestone-core island representing two major types found in the Everglades – were constructed in four macrocosms. A mixture of eight tree species was planted on …