Abstract
The effects of temperature, diffusive boundary-layer thickness, and sediment composition on fluxes of inorganic N and P were estimated for sediment cores with oxidized surfaces from nearshore waters (2–10 m) of a montane oligotrophic lake. Fluxes of N and P were not affected by diffusive boundary-layer thickness but were strongly affected by temperature. Below 16 °C, sediments sequestered small amounts of P and released small amounts of N. Above 16 °C, the seasonal maximum water temperature, sediments were substantial sources of N (NH4 +–N = 2–24 mg m−2 d−1; NO3 − + NO2 −–N = 2–5 mg m−2 d−1) and P (0.1–0.4 mg m−2 d−1), indicating potential responsiveness of sediment–water nutrient exchange, and of corresponding phytoplankton growth, to synoptic warming.
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Acknowledgments
Support for this research was provided by a Cooperative Institute for Research in Environmental Sciences (CIRES) graduate research fellowship to J. L Anthony. We are grateful to two reviewers for constructive criticism.
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Anthony, J.L., Lewis, W.M. Low boundary layer response and temperature dependence of nitrogen and phosphorus releases from oxic sediments of an oligotrophic lake. Aquat Sci 74, 611–617 (2012). https://doi.org/10.1007/s00027-012-0255-6
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DOI: https://doi.org/10.1007/s00027-012-0255-6