Abstract
Many lakes, ponds and reservoirs are subject to long and changing periods of ice cover. However, limited winter research has created key knowledge gaps. How does nitrogen cycling change under ice? And what does changing ice cover duration mean for water quality? Here we present the first measurements of denitrification rates under ice in temperate, polymictic waterbodies. Surprisingly, despite lower winter temperatures, winter and summer rates of denitrification did not differ. Experimental work suggests that denitrification rates are controlled hierarchically, first by nitrate concentrations, then by temperature. As a result, controls on nitrate inputs such as changing hydrology and nitrification, combined with physical controls on delivery of nitrate to sediments, may be more important to nitrate retention via denitrification than the duration of low temperature or ice cover. Nitrous oxide was typically supersaturated under-ice, suggesting an ice-out flux will occur, and this flux may be greatest in systems with elevated nitrate.
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Acknowledgements
The authors would like to acknowledge support of NSERC (Discovery Grant), the Global Institute for Water Security, and the University of Saskatchewan, School of Environment and Sustainability and the Teacher Scholar Doctoral Fellowship for funding this project. For their support and advice, we would like to thank Drs. Rebecca North, Angela Bedard-Haughn, John-Mark Davies, Karl-Erich Lindenschmidt and Cherie Westbrook. Further, we would like to acknowledge the following individuals for their extensive technical assistance, particularly those that aided in field work that took place in the extreme cold of Saskatchewan winters: Bruce Johnson, Dell Bayne, Jay Bauer, Britni Brenna, Cameron Hoggarth, Erin Hillis, Victor Sit, Kim Gilmour, Navjot Kaur, Rosa Brannen, Heather Wilson, Dr. Michael Kehoe, Alyse Kambeitz, Dr. Lorne Doig, Katya Dobrovolskkava, Katy Nugent, Beau Schlageter, Hayden Yip, Jeremy Kiss, Dr. Colin Whitfield, Sherry Olauson, Kate Wilson, Michelle Martel-Andre, Raea Gooding, Noel Galuschik, Zachary Keesey and all members of the Saskwatche (Saskatchewan Water Chemistry and Ecology) Lab.
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Cavaliere, E., Baulch, H.M. Denitrification under lake ice. Biogeochemistry 137, 285–295 (2018). https://doi.org/10.1007/s10533-018-0419-0
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DOI: https://doi.org/10.1007/s10533-018-0419-0