EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021

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6/05/2017 | 11:15 AM - 11:30 AM | CARBON... AND WHAT ELSE?: THE STOICHIOMETRY OF BROWNING IN LAKES OF NORTHERN WISCONSIN, USA | 306B

CARBON... AND WHAT ELSE?: THE STOICHIOMETRY OF BROWNING IN LAKES OF NORTHERN WISCONSIN, USA

Inputs of terrestrial dissolved organic matter (DOM) have increased substantially in many north temperate lakes. While this "browning" phenomena is often strictly associated with carbon, it likely also influences nutrient loading. In this paper, we characterize potential loads of carbon (C), nitrogen (N), and phosphorus (P) to seepage lakes in northern Wisconsin based on leachate source, watershed area, and shoreline development. Positive correlations between current C and N (R2=0.28, p<0.05) and P (R2=0.32, p<0.05) concentrations across lakes support allochthonous nutrient loading with DOM increases. We found that the molar C:N:P ratio was more P-rich in leaf leachates than soil leachates (leaves: 137:0.03:1, wetland soil: 185:7:1, forest soil: 459:31:1). Based on leachate stoichiometry and regional carbon budgets, we estimate that annual N and P fluxes to a lake could reach 900 and 300 kg, respectively. We constrain these fluxes using long-term records from regional seepage lakes that suggest, since 1984, browning has increased on average 4.6 Pt-Co yr-1 or 5.2 – 18.0 mg C L-1 (95% CI). Our results suggest that browning can have a substantial impact on lake stoichiometry and the ecological effects of this shift should be considered further.

C28 Land-Water Interfaces
C10 Biogeochemistry
S19 Elements and energy as fundamental currencies of nature: using ecological stoichiometry as a tool to advance the sustainability of freshwater ecosystems

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Presenters/Authors

Jessica Corman (), University of Nebraska - Lincoln, jesscorman@gmail.com;