2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2018 | 2:30 PM - 2:45 PM | SEASONAL PROGRESSION OF CONCENTRATION AND UPTAKE OF NITROGEN AND PHOSPHORUS IN A ROCKY MOUNTAIN STREAM | 330 B
SEASONAL PROGRESSION OF CONCENTRATION AND UPTAKE OF NITROGEN AND PHOSPHORUS IN A ROCKY MOUNTAIN STREAM
As the timing of snowmelt advances in a warming world, determining the seasonal progression of nutrient uptake in high elevation streams will be critical to understanding changes in the nutrient dynamics of these sensitive ecosystems. We measured stream-water concentrations and uptake rates of phosphorus, ammonium and nitrate during the growing season in a third-order stream at 3000m in Colorado, USA where snowmelt timing is advancing by 4 days per decade. In early spring, when snowmelt dominated streamflow, nutrients were at concentrations near their seasonal maximum and uptake was at a minimum. As summer progressed, phosphorus concentrations generally declined while uptake increased. For nitrogen, concentrations and uptake rates were not closely related. Ammonium concentrations decreased until late June, then increased through the end of September before decreasing again. Meanwhile, ammonium uptake rates increased throughout the study period. For nitrate, stream concentrations tracked melting snow, decreasing to low levels at baseflow. Nitrate uptake was below detectable levels throughout the study. In this stream, earlier snowmelt should increase stream uptake of phosphorus and ammonium, but since ammonium concentration and uptake are unrelated, only phosphorus concentrations are likely to decrease.
- Climate Change
- Flow
- Nitrogen
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Presenters/Authors
Derek West
(), North Carolina State University; Rocky Mountain Biological Laboratory, dcwest2@ncsu.edu;
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Jared Balik
(), North Carolina State University, Rocky Mountain Biological Laboratory, jabalik2@ncsu.edu;
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Brad Taylor
(), North Carolina State University Dept. of Applied Ecology; Rocky Mountain Biological Laboratory, bwtaylo3@ncsu.edu ;
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