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| Submitter's Name |
Bryce Van Dam |
| Session Name |
Posters - Understanding Natural, Anthropogenic and Legacy Sources of Nutrients |
| Category |
Understanding natural, anthropogenic and legacy sources of nutrients |
| Poster Number |
61 |
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| Author(s) |
Bryce Van Dam , UF Wetland Biogeochemistry Laboratory, Soil and Water Science Department, University of Florida (Presenting Author) |
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Todd Z. Osborne,
UF Wetland Biogeochemistry Laboratory, Soil and Water Science Department, University of Florida |
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Angelique Bochnak, Environmental Sciences Division, St Johns River Water Management District |
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Kanika S. Inglett, UF Wetland Biogeochemistry Laboratory, Soil and Water Science Department, University of Florida |
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Soil subsidence in a impacted Florida wetland |
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Current water management practices in the Upper St. Johns River Basin have resulted in significant losses of wetland soils in the St. Johns Marsh Conservation Area to subsidence (SJMCA). Because organic soils accrete at a very slow rate and oxidize rapidly under drained conditions, this soil subsidence is of major concern to water managers. With this permanent loss of soil material to oxidation comes the mineralization of other nutrients that contribute to downstream water quality degradation. Managers have relied on historic soil subsidence rates established as early as 1956 in the Everglades Agriculture Area which have been used to model soil loss in the SJMCA. While these well documented subsidence rates are certainly valid for the environments in which they were determined, their applicability to other systems is questionable. Therefore, we seek to model the effect of hydrologic status on soil subsidence for soils in the SJMCA. Field and laboratory studies were conducted in which CO2 and CH4 fluxes were monitored over changing hydrologic conditions. A separate lab study determined a subsidence rate that can be modeled along with gaseous carbon losses. |
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