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publications > paper > PP 1011 > ecosystems > freshwater and terrestrial > mixed swamp forests
Ecosystems of south Florida
Freshwater and terrestrial ecosystems
Mixed swamp forests
The Fakahatchee Strand is the largest mixed swamp forest in the Big Cypress Swamp. The strand was logged in the late 1940's and early 1950's, and virtually all large cypress trees were removed. Maple, oak, willow, and other swamp hardwoods became dominant after the removal (Alexander and Crook, 1973).
The strand is still known for its rich and diverse flora, which includes at least 39 species of orchids, some of which are found nowhere else (Luer, 1964), 20 species of ferns, and 11 species of bromeliads (Finn, 1966). Numerous small lakes are distributed along the axis of the strand.
Trees and shrubs are the primary producers of the mixed swamp forest. Their production sustains the animals and microbes. The Fakahatchee Strand, an undrained swamp, produced twice the total biomass and four times the woody growth as a nearby, but recently drained, swamp. Stress on the drained swamp-forest system was indicated by a thinning of the canopy; leaf litterfall was 45 percent greater in the drained swamp than in the undrained swamp. Thinning of the canopy decreases productivity and increases sunlight penetration. Increased sunlight accelerates drying of leaf litter and makes the system vulnerable to fire damage (Carter and others, 1973).
Cycling of mineral nutrients on the swamp-forest floor is also controlled by moisture conditions. Moist conditions accelerate litter decomposition by at least a factor of 1.3, creating favorable conditions for macrodecomposers to further accelerate the process by 1.6 times. As a result, concentrations of mineral nutrients increase more rapidly in the litter of the Fakahatchee than in the drained strand (Carter and others, 1973).
U.S. Department of the Interior, U.S. Geological Survey
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Last updated: 04 September, 2013 @ 02:04 PM (KP)
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