Eutrophication exacerbates the impact of climate warming on lake methane emission.

Autor: Sepulveda-Jauregui A; Water and Environmental Research Center, University of Alaska Fairbanks, Fairbanks, AK 99775, United States; Department of Experimental Limnology, Leibniz Institute of Freshwater Ecology and Inland Fisheries, 16775 Stechlin, Germany. Electronic address: armando.sepulveda@umag.cl., Hoyos-Santillan J; Division of Agricultural and Environmental Sciences, University of Nottingham, Nottingham, East Midlands LE12 5RD, United Kingdom. Electronic address: jhoyosantillan@hotmail.com., Martinez-Cruz K; Department of Experimental Limnology, Leibniz Institute of Freshwater Ecology and Inland Fisheries, 16775 Stechlin, Germany; Biotechnology and Bioengineering Department, Cinvestav, Mexico City 07360, Mexico. Electronic address: karla.martinez@umag.cl., Walter Anthony KM; Water and Environmental Research Center, University of Alaska Fairbanks, Fairbanks, AK 99775, United States. Electronic address: kmwalteranthony@alaska.edu., Casper P; Department of Experimental Limnology, Leibniz Institute of Freshwater Ecology and Inland Fisheries, 16775 Stechlin, Germany. Electronic address: pc@igb-berlin.de., Belmonte-Izquierdo Y; Biotechnology and Bioengineering Department, Cinvestav, Mexico City 07360, Mexico., Thalasso F; Biotechnology and Bioengineering Department, Cinvestav, Mexico City 07360, Mexico. Electronic address: thalasso@cinvestav.mx.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2018 Sep 15; Vol. 636, pp. 411-419. Date of Electronic Publication: 2018 Apr 27.
DOI: 10.1016/j.scitotenv.2018.04.283
Abstrakt: Net methane (CH 4 ) emission from lakes depends on two antagonistic processes: CH 4 production (methanogenesis) and CH 4 oxidation (methanotrophy). It is unclear how climate warming will affect the balance between these processes, particularly among lakes of different trophic status. Here we show that methanogenesis is more sensitive to temperature than methanotrophy, and that eutrophication magnifies this temperature sensitivity. Using laboratory incubations of water and sediment from ten tropical, temperate and subarctic lakes with contrasting trophic states, ranging from oligotrophic to hypereutrophic, we explored the temperature sensitivity of methanogenesis and methanotrophy. We found that both processes presented a higher temperature sensitivity in tropical lakes, followed by temperate, and subarctic lakes; but more importantly, we found that eutrophication triggered a higher temperature sensitivity. A model fed by our empirical data revealed that increasing lake water temperature by 2 °C leads to a net increase in CH 4 emissions by 101-183% in hypereutrophic lakes and 47-56% in oligotrophic lakes. We conclude that climate warming will tilt the CH 4 balance towards higher lake emission and that this impact will be exacerbated by the eutrophication of the lakes.
(Copyright © 2018 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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