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FLOATING ISLANDS--BIOGEOMORPHIC FEATURES OF HILLSBORO MARSH, NORTHEASTERNEVERGLADES, FLORIDA
Title
FLOATING ISLANDS--BIOGEOMORPHIC FEATURES OF HILLSBORO MARSH, NORTHEASTERNEVERGLADES, FLORIDA.
Creator
STONE, PETER ALAN., Florida Atlantic University, Craig, Alan K., Charles E. Schmidt College of Science, Department of Geosciences
Abstract/Description
Floating islands are common natural features in modern Hillsboro Marsh. Most floating islands: 1) occur as detached, free-floating batteries (raft-like peaty masses that rise from substrate), and 2) form in habitats containing abundant waterlilies. New batteries are quickly colonized by marsh, and often terrestrial, plants. Differences in species diversity and early succession occur between two ecologically different subareas. In one subarea many batteries succeed quickly to mixed graminoid...
Show moreFloating islands are common natural features in modern Hillsboro Marsh. Most floating islands: 1) occur as detached, free-floating batteries (raft-like peaty masses that rise from substrate), and 2) form in habitats containing abundant waterlilies. New batteries are quickly colonized by marsh, and often terrestrial, plants. Differences in species diversity and early succession occur between two ecologically different subareas. In one subarea many batteries succeed quickly to mixed graminoid-arborescent vegetation. Floating batteries form hydrologically unusual Everglades habitats and support some locally rare plants. Battery formation produces local topographic elevations and depressions. Apparent size-successional vegetational and landform continuumns seem to link batteries with small extant tree-islands. Radiometric evidence suggests presence of batteries in peat profiles of two tree-islands. Everglades floating islands most resemble others reported in southeastern United States and appear dissimilar morphologically and in mode of origin to those reported from elsewhere worldwide.
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Date Issued
1978
PURL
http://purl.flvc.org/fcla/dt/13940
Subject Headings
Islands--Florida--Everglades, Botany--Florida--Ecology, Everglades (Fla)
Format
Document (PDF)
Investigating biogenic gas dynamics from peat soils of the Everglades using hydrogeophysical methods
Title
Investigating biogenic gas dynamics from peat soils of the Everglades using hydrogeophysical methods.
Creator
Wright, William J., Comas, Xavier, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Geosciences
Abstract/Description
Peat soils are known to be a significant emitter of atmospheric greenhouse gasses. However, the spatial and temporal variability in production and release of greenhouse gases (such as methane) in peat soils remains uncertain, particularly for low-latitude peatlands like the Florida Everglades, as the majority of studies on gas dynamics in peatlands focus on northern peatlands. The purpose of the work outlined here is focused on understanding the spatial and temporal variability in biogenic...
Show morePeat soils are known to be a significant emitter of atmospheric greenhouse gasses. However, the spatial and temporal variability in production and release of greenhouse gases (such as methane) in peat soils remains uncertain, particularly for low-latitude peatlands like the Florida Everglades, as the majority of studies on gas dynamics in peatlands focus on northern peatlands. The purpose of the work outlined here is focused on understanding the spatial and temporal variability in biogenic gas dynamics (i.e. production and release of methane and carbon dioxide) by implementing various experiments in the Florida Everglades at different scales of measurement, using noninvasive hydrogeophysical methods. Non-invasive methods include ground-penetrating radar (GPR), gas traps, time-lapse cameras, and hydrostatic pressure head measurements, that were constrained with direct measurements on soil cores like porosity, and gas composition using gas chromatography. By utilizing the measurements of in-situ gas volumes, we are able to estimate gas production using a mass balance approach, explore spatial and temporal variabilities of gas dynamics, and better constrain gas ebullition models. A better understanding of the spatial and temporal variability in gas production and release in peat soils from the Everglades has implications regarding the role of subtropical wetlands in the global carbon cycle, and can help providing better production and flux estimates to help global climate researchers improve their predictions and models for climate change.
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Date Issued
2018
PURL
http://purl.flvc.org/fau/fd/FA00013146
Subject Headings
Peat soils, Gas dynamics, Carbon cycle (Biogeochemistry), Everglades (Fla), Biogenic gas
Format
Document (PDF)
INVESTIGATING THE EFFECTS OF SEA-LEVEL RISE AND INCREASED SALINITY ON PEAT SOILS OF THE EVERGLADES (FLORIDA): IMPLICATIONS FOR CHANGES IN BIOGENIC GAS DYNAMICS AND PEAT COLLAPSE
Title
INVESTIGATING THE EFFECTS OF SEA-LEVEL RISE AND INCREASED SALINITY ON PEAT SOILS OF THE EVERGLADES (FLORIDA): IMPLICATIONS FOR CHANGES IN BIOGENIC GAS DYNAMICS AND PEAT COLLAPSE.
Creator
Sirianni, Matthew J., Comas, Xavier, Florida Atlantic University, Department of Geosciences, Charles E. Schmidt College of Science
Abstract/Description
While repeated transgressive and regressive sea level cycles have shaped south Florida throughout geological history, modern rates of sea level rise pose a significant risk to the structure and function of the freshwater wetland ecosystems throughout the low-lying Everglades region. Current regionally corrected sea level projections for south Florida indicate a rise of 0.42m by 2050 and 1.15m by 2100, suggesting the salinization of previously freshwater areas of the Everglades is conceivable....
Show moreWhile repeated transgressive and regressive sea level cycles have shaped south Florida throughout geological history, modern rates of sea level rise pose a significant risk to the structure and function of the freshwater wetland ecosystems throughout the low-lying Everglades region. Current regionally corrected sea level projections for south Florida indicate a rise of 0.42m by 2050 and 1.15m by 2100, suggesting the salinization of previously freshwater areas of the Everglades is conceivable. As freshwater areas become increasingly exposed to saltwater they experience shifts in vegetation composition, soil microbial populations, plant productivity, and physical soil properties that ultimately result in a phenomenon called peat collapse. Recent work in the Everglades has sought to further explain the mechanisms of peat collapse, however the physical changes to the peat matrix induced by saltwater intrusion are still uncertain. Moreover, the combination of physical alterations to the peat matrix associated with peat collapse and shifts in wetland salinity regimes will also likely disrupt the current carbon gas dynamics of the Everglades.
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Date Issued
2020
PURL
http://purl.flvc.org/fau/fd/FA00013589
Subject Headings
Sea level rise, Peat soils, Everglades (Fla)
Format
Document (PDF)