Estuaries and Coasts

, Volume 40, Issue 3, pp 822–831 | Cite as

Iron and Pyritization in Wetland Soils of the Florida Coastal Everglades

  • Paul JulianEmail author
  • Randy Chambers
  • Timothy Russell


We explored environmental factors influencing soil pyrite formation within different wetland regions of Everglades National Park. Within the Shark River Slough (SRS) region, soils had higher organic matter (62.65 ± 1.88 %) and lower bulk density (0.19 ± 0.01 g cm−3) than soils within Taylor Slough (TS; 14.35 ± 0.82 % and 0.45 ± 0.01 g cm−3, respectively), Panhandle (Ph; 15.82 ± 1.37 % and 0.34 ± 0.009 g cm−3, respectively), and Florida Bay (FB; 5.63 ± 0.19 % and 0.73 ± 0.02 g cm−3, respectively) regions. Total reactive sulfide and extractable iron (Fe) generally were greatest in soils from the SRS region, and the degree of pyritization (DOP) was higher in soils from both SRS (0.62 ± 0.02) and FB (0.52 ± 0.03) regions relative to TS and Ph regions (0.30 ± 0.02 and 0.31 ± 0.02, respectively). Each region, however, had different potential limits to pyrite formation, with SRS being Fe and sulfide limited and FB being Fe and organic matter limited. Due to the calcium-rich soils of TS and Ph regions, DOP was relatively suppressed. Annual water flow volume was positively correlated with soil DOP. Soil DOP also varied in relation to distance from water management features and soil percent organic matter. We demonstrate the potential use of soil DOP as a proxy for soil oxidation state, thereby facilitating comparisons of wetland soils under different flooding regimes, e.g., spatially or between wet years versus dry years. Despite its low total abundance, Fe plays an important role in sulfur dynamics and other biogeochemical cycles that characterize wetland soils of the Florida coastal Everglades.


Iron Sulfur Pyrite Everglades Carbon 



We would like to thank the FCE LTER crew for field support and the anonymous peer reviewer(s) and editor(s) for their efforts and constructive review of this manuscript. This material was developed in collaboration with the FCE LTER program which is funded by National Science Foundation Grant No. DEB-9910514, Grant No. DBI-0620409, and Grant No. DEB-1237517.


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Copyright information

© Coastal and Estuarine Research Federation 2016

Authors and Affiliations

  1. 1.Florida Department of Environmental Protection, Office of Ecosystem ProjectsFort MyersUSA
  2. 2.University of Florida, Soil and Water SciencesFt. PierceUSA
  3. 3.College of William and Mary, W.M. Keck Environmental Field LaboratoryWilliamsburgUSA

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