2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/22/2018 | 2:00 PM - 2:15 PM | LAND USE RESPONSES AND SEASONAL ADAPTATION OF WHOLE-STREAM METABOLISM AND NITRATE UPTAKE REVEALED BY HIGH-FREQUENCY, IN-SITU SENSORS | 321
LAND USE RESPONSES AND SEASONAL ADAPTATION OF WHOLE-STREAM METABOLISM AND NITRATE UPTAKE REVEALED BY HIGH-FREQUENCY, IN-SITU SENSORS
Stoichiometric constraints imply that the cycling of carbon and other essential nutrients are closely coupled in space and time in stream ecosystems. Rates of cycling and their driving processes are affected by numerous environmental variables (e.g., temperature and light) and may be modified by land use and land cover. In this study, we used a combination of in-situ¬ sensor technologies to estimate gross ecosystem production (GEP), ecosystem respiration (ER), and nitrate uptake (NU) in streams draining three watersheds with different dominant land uses: forested, agricultural, and urban. GEP and ER differed significantly among watersheds and within seasons, following patterns in light and nutrient availability. We observed seasonal patterns in metabolic sub-parameters (alpha, Pmax) that may reflect community-scale algal succession or adaption. We calculated NU based on diurnal fluctuations in dissolved nitrate concentrations measured continuously by in-situ spectrophotometers. NU was significantly correlated with GEP, especially in the most productive stream (urban). The NU was higher than expected based on GEP and simple (Redfield) stoichiometric considerations. When potential rates of denitrification were considered, the ratio of NU and GEP were in better alignment.
- Metabolism
- Nutrients
- Landuse
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Presenters/Authors
William Breck Bowden
(), University of Vermont, breck.bowden@uvm.edu;
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Ryan Sleeper
(), University of Vermont, rsleeper@uvm.edu;
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Matthew Vaughan
(), Lake Champlain Basin Program, mvaughan@lcbp.org;
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Andrew Schroth
(), University of Vermont, aschroth@uvm.edu;
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