2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/26/2021 | 8:30 AM - 10:30 AM | WHOLE WETLAND DENITRIFICATION POTENTIAL IN AGRICULTURALLY IMPACTED WETLANDS | Virtual Platform
WHOLE WETLAND DENITRIFICATION POTENTIAL IN AGRICULTURALLY IMPACTED WETLANDS
In agriculturally impacted watersheds, wetlands are valued for their capacity to intercept and remove nutrients that otherwise might degrade water quality in river networks. Vegetation in these wetlands tends toward monocultures of tolerant species such as Typha spp., which suppresses other vegetation via dense canopies and detrital mats. In this study, we investigated the contribution of vegetation to nitrate removal via assimilation and enhanced denitrification in two agriculturally impacted wetlands. Denitrification rates were assessed on all available solid substrates, which included sediments, detritus, and surfaces of live vegetation. Areal denitrification rates were greatest on sediments but occurred on all substrates including detritus and living biomass surfaces. Per area, denitrification potential for non-sediment substrates accounted for 20 % of total nitrate removal via denitrification. Dissolved oxygen measurements showed that anoxic conditions, which favor denitrification, extended over half the water column depth for over 12 hours every day. These results suggest that, from a watershed management perspective, the aggressive biomass accumulation of Typha canopies may be well matched with the aggressive nitrate loading in intensively managed agricultural landscapes.
- Biogeochemistry
- Ecosystem functioning
- Nature-based solutions
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Presenters/Authors
Amy Hansen
(), University of Kansas, amy.hansen@ku.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -