EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
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5/23/2018 | 9:30 AM - 9:45 AM | CONCENTRATION AND COMPOSITION OF DISSOLVED ORGANIC MATTER IN TEMPORARY DEPRESSIONAL WETLANDS ON THE DELMARVA PENINSULA VARY BETWEEN WETLANDS AND SEASONS | 321
CONCENTRATION AND COMPOSITION OF DISSOLVED ORGANIC MATTER IN TEMPORARY DEPRESSIONAL WETLANDS ON THE DELMARVA PENINSULA VARY BETWEEN WETLANDS AND SEASONS
Small, seasonally inundated depressional wetlands occur throughout the Delmarva Peninsula. Many form surface connections to perennial streams when inundated, exporting water and materials that may affect stream ecosystem structure or function. These wetlands are known to contain high concentrations of dissolved organic carbon (DOC) in the form of dissolved organic matter (DOM), but this material has not been characterized in detail. Understanding variation in DOM between wetlands and between seasons is necessary to understand the role of DOM in carbon cycling in these wetlands, and is the basis of understanding the potential impact of DOM exports on stream ecosystems.
We describe spatial and temporal variability in DOC concentrations and optical properties of surface water DOM in 20 wetlands distributed across a small area (<1600 hectares). Additionally, we report the likely molecular formulae of solid phase extracts from several wetlands. DOC concentrations varied between wetlands and through time (from 10 to over 40 mg/L). Canopy cover or wetland size may explain seasonal differences in optical properties. Delmarva wetland DOM resembles material described elsewhere as terrestrially-derived and humic, but the variation here presents opportunities to refine ecological implications within these categories.
- Wetland
- Carbon
- Biogeochemistry
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Presenters/Authors
Alec Armstrong
(), University of Maryland, aarmstr1@umd.edu;
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Margaret Palmer
(), National Socio-Environmental Synthesis Center, mpalmer@sesync.org;
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Michael Gonsior
(), Chesapeake Biological Laboratory , gonsior@umces.edu;
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