EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
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5/22/2018 | 11:00 AM - 11:15 AM | DOES DENITRIFICATION GET MEMORIAL DAY OFF? AN EXAMINATION OF VARIATION IN DENITRIFICATION OVER DAILY TO SEASONAL TIME SCALES IN A FORESTED STREAMS | 330 B
DOES DENITRIFICATION GET MEMORIAL DAY OFF? AN EXAMINATION OF VARIATION IN DENITRIFICATION OVER DAILY TO SEASONAL TIME SCALES IN A FORESTED STREAMS
Environmental conditions in streams vary from daily to seasonal time scales, likely driving similar temporal variation in biogeochemical processes. Yet, biogeochemists rarely quantify variation in processes at time scales shorter than seasonal. We are studying how denitrification rates vary across seasonal, weekly, and daily time scales and quantifying environmental drivers of this variability in two temperate forested streams in the Upper Peninsula of Michigan. We are measuring denitrification rates biweekly year-round, as well as daily over a 2-week period in spring, summer and fall starting in May 2017. Denitrification rates measured in sediment cores fluctuate throughout the year (range = 0 - 4160 µg N/m2/hr), with the highest rates in July and lowest in May and December. Yet, daily rates over a 2-week period in May exhibited a similar range in variability, increasing from 0 µg N/m2/hr on the first day of the sampling period to 2790 µg N/m2/hr on the last. We are currently expanding this study to include measurements of nitrification and open water metabolism. Studying these processes together will aid in understanding conditions driving variability in denitrification rates across temporal scales.
- Nitrogen
- Biogeochemistry
- Nitrification
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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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