2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/25/2021 | 2:00 PM - 3:30 PM | MODELING MOUNTAIN STREAM METABOLISM AND UPLAND RATES OF BIOTIC NITROGEN UPTAKE | Virtual Platform
MODELING MOUNTAIN STREAM METABOLISM AND UPLAND RATES OF BIOTIC NITROGEN UPTAKE
Headwater streams draining mountain watersheds can retain or remove nitrogen (N) and reduce nutrient loading to downstream lake ecosystems sensitive to nutrient loading. Gross primary productivity and the rate of biomass accrual can drive in-stream N uptake, but the strength of this relationship and how it varies seasonally among streams with different flow regimes is unclear. We estimated gross primary production (GPP) and ecosystem respiration (ER) rates from September 18th to October 29th 2020, in three comparative streams draining catchments along the western shore of Lake Tahoe in the Sierra Nevada mountains. GPP and ER ranged from 0.172 to 5.482 and -17.043 to -2.152 g O2 m-2 d-1, respectively. This preliminary analysis is a first step towards linking upland processes (i.e. stream metabolism) with downstream processes (i.e. nearshore productivity) to assess the degree of control mountain stream biota exert on watershed nutrient export as well as the degree of synchrony between in-stream and nearshore lake productivity. Future work seeks to apply modeled GPP and ER and intra-seasonal rates of stream biota N uptake to identify when and where maximum nitrogen uptake may occur in streams draining to Lake Tahoe.
- Ecosystem Dynamics
- Nutrient cycling
- Carbon cycle
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Presenters/Authors
Kelly Loria
(), University of Nevada Reno, kelly.loria@nevada.unr.edu;
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Joanna Blaszczak
(), Global Water Center and Department of Natural Resources and Environmental Science, University of Nevada, Reno, jblaszczak@unr.edu;
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