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Estuaries and Coasts

, Volume 30, Issue 3, pp 491–496 | Cite as

Belowground decomposition of mangrove roots in Florida coastal everglades

  • Nicole Poret
  • Robert R. Twilley
  • Victor H. Rivera-Monroy
  • Carlos Coronado-Molina
Article

Abstract

Mangrove root decomposition rates were measured by distributing mesh bags containing fine root material across six sites with different soil fertility and hydroperiod to compare ambient differences to substrate quality. Roots from a site with lower soil phosphorus concentration were used as a reference and compared to ambient roots at five other sites with increased phosphorus concentration. Four mesh bags of each root type (ambient versus reference), separated into four 10-cm replicate intervals, were buried up to 42 cm depth at each site and incubated for 250 d (initiation in May 2004). Mass loss of ambient mangrove roots was significant at all study sites and ranged from 17% to 54%; there was no significant difference with depth at any one site. Reference decomposition constants (−k) ranged from 0.0012 to 0.0018 d−1 among Taylor Slough sites compared to 0.0023–0.0028 d−1 among Shark River sites, indicating slower decomposition rates associated with lower soil phosphorous and longer flood duration. Reference roots had similar decomposition rates as ambient roots in four of the six sites, and there were no significant correlations between indices of root substrate quality and decomposition rates. Among these distinct landscape gradients of south Florida mangroves, soil environmental conditions have a greater effect on belowground root decomposition than root substrate quality.

Keywords

Lignin Mangrove Forest Root Decomposition High Decomposition Rate Mangrove Root 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Estuarine Research Federation 2007

Authors and Affiliations

  • Nicole Poret
    • 1
  • Robert R. Twilley
    • 2
  • Victor H. Rivera-Monroy
    • 2
  • Carlos Coronado-Molina
    • 3
  1. 1.Department of BiologyUniversity of Louisiana at LafayetteLafayette
  2. 2.Wetland Biogeochemistry Institute, Department of Oceanography and Coastal SciencesLouisiana State UniversityBaton Rouge
  3. 3.South Florida Water Management DistrictWest Palm Beach

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