The interactive effects of temperature and light on biological nitrogen fixation in boreal forests.

The New Phytologist
Michael J GundaleA Jäderlund

Abstract

Plant productivity is predicted to increase in northern latitudes as a result of climate warming; however, this may depend on whether biological nitrogen (N)-fixation also increases. We evaluated how the variation in temperature and light affects N-fixation by two boreal feather mosses, Pleurozium schreberi and Hylocomium splendens, which are the primary source of N-fixation in most boreal environments. We measured N-fixation rates 2 and 4 wk after exposure to a factorial combination of environments of normal, intermediate and high temperature (16.3, 22.0 and 30.3°C) and light (148.0, 295.7 and 517.3 μmol m(-2) s(-1)). Our results showed that P. schreberi achieved higher N-fixation rates relative to H. splendens in response to warming treatments, but that the highest warming treatment eventually caused N-fixation to decline for both species. Light strongly interacted with warming treatments, having positive effects at low or intermediate temperatures and damaging effects at high temperatures. These results suggest that climate warming may increase N-fixation in boreal forests, but that increased shading by the forest canopy or the occurrence of extreme temperature events could limit increases. They also suggest that P. schreber...Continue Reading

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Citations

Jun 15, 2012·Biology Letters·Michael J GundaleMarie-Charlotte Nilsson
Apr 22, 2016·Oecologia·Jonathan A Whiteley, Andrew Gonzalez
Nov 25, 2016·The New Phytologist·Kathrin RouskJean-Philippe Bellenger
Jun 15, 2018·Environmental Microbiology·Hannah Holland-MoritzNoah Fierer
Mar 10, 2019·Applied and Environmental Microbiology·Emily B GrahamKirsten S Hofmockel
Nov 19, 2014·Microbial Ecology·Kathrin RouskAnders Michelsen
Feb 25, 2021·Microbiome·Hannah Holland-MoritzNoah Fierer
Jul 12, 2021·The Science of the Total Environment·Danillo O Alvarenga, Kathrin Rousk
Feb 15, 2019·The Science of the Total Environment·Maija SalemaaAino Smolander

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