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The Interactive Effects of Temperature and Light on Biological Nitrogen Fixation in Boreal Forest

Permanent URL:
http://handle.nal.usda.gov/10113/58783
File:
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Abstract:
• Plant productivity is predicted to increase in northern latitudes due to climate warming; however, this may depend on whether biological N-fixation also increases. We evaluated how variation in temperature and light affect 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 two and four weeks after exposure to a factorial combination 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) environments. • 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 occurrence of extreme temperature events could limit increases. They also suggest that P. schreberi may become a larger source of N in boreal forests relative to H. splendens as climate warming progresses.
Author(s):
Michael J. Gundale , Madeleine Nilsson , Sheel Bansal , Anders Jaderlund
Subject(s):
Hylocomium splendens , Pleurozium schreberi , boreal forests , forest canopy , global warming , latitude , nitrogen , nitrogen fixation , population dynamics , temperature
Note:
USDA Scientist Submission
Source:
New phytologist 2012 v.194
Language:
English
Year:
2012
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.