2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/23/2019 | 11:30 AM - 11:45 AM | THE ROLE OF DENITRIFICATION IN CARBON REMOVAL FROM STREAM ECOSYSTEMS | 251 AB
THE ROLE OF DENITRIFICATION IN CARBON REMOVAL FROM STREAM ECOSYSTEMS
For every 4 mol of nitrate used in denitrification, 5 mol of organic carbon (C) is removed from an ecosystem. This potentially large removal of carbon often goes overlooked when considering C fluxes in streams, which are often derived from O2 based modeling and do not account for anaerobic forms of respiration including denitrification. Our objective is to evaluate the role of denitrification in C removal in 36 streams across the United States. Denitrification measured using acetylene block assays ranged from 0-22900 µg N/m2/hr, with the highest rates measured in McDiffitt Creek, KS during a drought and under hypoxic conditions. We estimate that denitrification removed 24536 µg C/m2/hr in this stream, when aerobic respiration rates measured using light-dark chambers were close to 0. In contrast, in Hop Brook, MA, aerobic respiration rates were high (29000 µg C/m2/hr), but denitrification removed an additional 2000 µg C/m2/hr; a roughly 6% increase over aerobic respiration measurements alone. The role denitrification plays in carbon removal can range widely depending on stream and substrate conditions but must be considered to accurately develop carbon budgets.
- Metabolism
- Nitrogen
- Carbon
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Presenters/Authors
Kevin Nevorski
(), Michigan Technological University, kcnevors@mtu.edu;
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Amy Marcarelli
(), Michigan Technological University, ammarcar@mtu.edu;
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