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Low boundary layer response and temperature dependence of nitrogen and phosphorus releases from oxic sediments of an oligotrophic lake |
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| Authors: | J L Anthony W M Lewis Jr |
| Institution: | 1. Center for Limnology, Cooperative Institute for Research in Environmental Sciences, University of Colorado, 216 UCB, Boulder, CO, 80309-0216, USA 2. Department of Ecology and Evolutionary Biology, University of Colorado, 334 UCB, Boulder, CO, 80309-0334, USA 3. Colorado Division of Wildlife, 6060 Broadway, Denver, CO, 80216, USA |
| 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?C10?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 +?CN?=?2?C24?mg?m?2 d?1; NO3 ??+?NO2 ??CN?=?2?C5?mg?m?2 d?1) and P (0.1?C0.4?mg?m?2 d?1), indicating potential responsiveness of sediment?Cwater nutrient exchange, and of corresponding phytoplankton growth, to synoptic warming. |
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