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Assessing Biogeochemical Cycling and Transient Storage of Surface Water in Eastern Siberian Streams Using Short-term Solute Additions

Assessing Biogeochemical Cycling and Transient Storage of Surface Water in Eastern Siberian Streams Using Short-term Solute Additions
Type: 
Poster
Erin Seybold1, Travis Drake2, John Schade3, Ekaterina Bulygina4, Andy Bunn5, Sudeep Chandra6, Sergei Davydov7, Karen Frey8, Robert M. Holmes9, William Sobczak10, Valentin Spektor11, Katey Walter Anthony12, Sergei Zimov13
1St. Olaf College, Northfield, MN, 55057, USA, seybold [at] stolaf [dot] edu
2Carleton College, Northfield, MN, 55057, USA
3St. Olaf College, Northfield, MN, 55057, USA
4Woods Hole Research Center, Falmouth, MA, 02154, USA
5Western Washington University, Bellingham, WA, 98225, USA
6University of Nevada-Reno, Reno, NV, 89501, USA
7Northeast Science Station, Cherskiy, Russia
8Clark University, Worcester, MA, 01601, USA
9Woods Hole Research Center, Falmouth, MA, 02540, USA
10College of the Holy Cross, Worcester, MA, 01601, USA
11Yakutsk State University, Yakutsk, Russia
12Water and Environmental Research Center, University of Alaska, Fairbanks, AK, USA
13Northeast Science Station, Cherskiy, Russia

Recent studies highlight the role of stream networks in the processing of nutrient and organic matter inputs from the surrounding watershed. Clear evidence exists that streams actively regulate fluxes of carbon, nitrogen and phosphorus from upland terrestrial ecosystems to downstream aquatic environments. This is of particular interest in arctic streams because of the potential impact of permafrost thaw due to global warming on inputs of nutrients and organic matter to small streams high in the landscape. Knowledge of functional characteristics of these stream ecosystems is paramount to our ability to predict changes in stream ecosystems as climate changes. Biogeochemical models developed by stream ecologists, specifically nutrient spiraling models, provide a set of metrics that we used to assess nutrient processing rates in several streams in the eastern Siberian Arctic. We quantified these metrics using solute addition experiments in which nitrogen and phosphorus were added simultaneously with chloride as a conservative tracer. We focused on 5 streams, three flowing across upland yedoma soils and two floodplain streams. Yedoma streams showed similar uptake of nitrogen (N) and phosphorous (P), suggesting CO- limitation of biological processes, with a large variation between these three streams in the magnitude of nutrient uptake. Floodplain streams both showed substantially higher P uptake than N uptake, indicating strong P limitation. Given these results, it is probable that these two types of streams will respond quite differently to changes in nutrient and organic matter inputs as permafrost thaws.

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National Science Foundation | Division of Arctic Sciences
National Science Foundation
National Oceanic and Atmospheric Administration
National Oceanic and Atmospheric Administration
International Arctic Systems for Observing the Atmosphere
International Arctic Systems for Observing the Atmosphere
Study of Environmental Arctic Change
Study of Environmental Arctic Change
Arctic System Science Program
Arctic System Science Program
US Arctic Research Commission
US Arctic Research Commission
North Slope Science Initiative
North Slope Science Initiative
International Arctic Science Committee
International Arctic Science Committee
Arctic Ocean Sciences Board
Arctic Ocean Sciences Board
Alaska Ocean Observing System
Alaska Ocean Observing System
Department of Energy
Department of Energy
National Aeronautics and Space Administration
National Aeronautics and Space Administration
World Wildlife Fund
WWF
Association of Polar Early Career Scientists
Association of Polar Early Career Scientists
Bureau of Land Management
Bureau of Land Management
International Study of Arctic Change
International Study of Arctic Change
ArcticNet
ArcticNet
DAMOCLES
Developing Arctic Modeling and Observing Capabilities for Long-term Environmental Studies

This work is supported by the National Science Foundation (NSF) under the ARCUS Cooperative Agreement ARC-0618885. Any opinions, findings, and conclusions or recommendations expressed do not necessarily reflect the views of the NSF.