Biogeochemical contributions of tree islands to Everglades wetland landscape nitrogen cycling during seasonal inundation

Tiffany G. Troxler, Daniel Childers

    Research output: Contribution to journalArticle

    9 Scopus citations

    Abstract

    In the Florida Everglades, tree islands are conspicuous heterogeneous elements in the herbaceous wetland landscape. We characterized the biogeochemical role of a seasonally flooded tree island during wet season inundation, specifically examining hydrologically mediated flows of nitrogen (N) and N retention by the tree island. We estimated ecosystem N standing stocks and fluxes, soil and litter N transformation rates, and hydrologic fluxes of N to quantify the net ecosystem N mass flux. Results showed that hydrologic sources of N were dominated by surface water loads of nitrate (NO3) and ammonium (NH4). Nitrate immobilization by soils and surficial leaf litter was an important sink for surface water dissolved inorganic N (DIN). We estimated that the net annual DIN retention by a seasonally flooded tree island was 20.5 ± 5.0 g m-2 during wet season inundation. Based on the estimated tree island surface water DIN loading rate, a seasonally flooded tree island retained 76% of imported DIN. As such, seasonally flooded tree islands have the potential to retain 55% of DIN entering the marsh landscape via upstream canal overland flow in the wet season. By increasing reactive surface area and DOC availability, we suggest that tree islands promote convergence of elements that enhance DIN retention. Tree islands of this region are thus important components of landscape-scale restoration efforts that seek to reduce sources of anthropogenic DIN to downstream estuaries.

    Original languageEnglish (US)
    Pages (from-to)75-89
    Number of pages15
    JournalEcosystems
    Volume13
    Issue number1
    DOIs
    StatePublished - Feb 1 2010

    Keywords

    • Denitrification
    • Ecosystem budget
    • Gross mineralization
    • Gross nitrification
    • Landscape heterogeneity
    • Nitrogen fixation
    • Plant uptake

    ASJC Scopus subject areas

    • Ecology, Evolution, Behavior and Systematics
    • Environmental Chemistry
    • Ecology

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