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Temporal Dynamics in the Concentration, Flux, and Optical Properties of Tree‐Derived Dissolved Organic Matter in an Epiphyte‐Laden Oak‐Cedar Forest
Author(s) -
Van Stan John T.,
Wagner Sasha,
Guillemette François,
Whitetree Ansley,
Lewis Julius,
Silva Leticia,
Stubbins Aron
Publication year - 2017
Publication title -
journal of geophysical research: biogeosciences
Language(s) - English
Resource type - Journals
eISSN - 2169-8961
pISSN - 2169-8953
DOI - 10.1002/2017jg004111
Subject(s) - stemflow , throughfall , dissolved organic carbon , environmental science , hydrology (agriculture) , plant litter , tree canopy , environmental chemistry , soil water , canopy , ecology , chemistry , nutrient , soil science , geology , biology , geotechnical engineering
Studies on the fate and transport of dissolved organic matter (DOM) along the rainfall‐to‐discharge flow pathway typically begin in streams or soils, neglecting the initial enrichment of rainfall with DOM during contact with plant canopies. However, rain water can gather significant amounts of tree‐derived DOM (tree‐DOM) when it drains from the canopy, as throughfall, and down the stem, as stemflow. We examined the temporal variability of event‐scale tree‐DOM concentrations, yield, and optical (light absorbance and fluorescence) characteristics from an epiphyte‐laden Quercus virginiana ‐ Juniperus virginiana forest on Skidaway Island, Savannah, Georgia (USA). All tree‐DOM fluxes were highly enriched in dissolved organic carbon (DOC) compared to rainfall, and epiphytes further increased concentrations. Stemflow DOC concentrations were greater than throughfall across study species, yet larger throughfall water yields produced greater DOC yields versus stemflow. Tree‐DOM optical characteristics indicate it is aromatic‐rich with fluorescent DOM dominated by humic‐like fluorescence, containing 10–20% protein‐like (tryptophan‐like) fluorescence. Storm size was the only storm condition that strongly correlated with tree‐DOM concentration and flux; however, throughfall and stemflow optical characteristics varied little across a wide range of storm conditions (from low magnitude events to intense tropical storms). Annual tree‐DOM yields from the study forest (0.8–46 g C m −2 yr −1 ) were similar to other yields from discrete down‐gradient fluxes (litter leachates, soil leachates, and stream discharge) along the rainfall‐to‐discharge flow path.