NDLI: Moss-specific changes in nitrogen fixation following two decades of warming, shading, and fertilizer addition

Content Provider	Springer Nature Link
Author	Sorensen, Pernille L. Lett, Signe Michelsen, Anders
Copyright Year	2012
Abstract	Climate warming will induce changes in Arctic ecosystem carbon balance, but besides climate, nitrogen availability is a critical controlling factor of carbon cycling. It is therefore essential to obtain knowledge on the influence of a changing climate on nitrogen fixation, as this process is the main source of new nitrogen to arctic ecosystems. In order to gain information on future nitrogen fixation rates in a changing climate, we studied the effects of two decades of warming with passive greenhouses, shading with sackcloth, and fertilization with NPK fertilizer on nitrogen fixation rates. To expand the knowledge on species-specific responses, we measured nitrogen fixation associated with two moss species: Hylocomium splendens and Aulacomnium turgidum. Our expectations of decreased nitrogen fixation rates in the fertilizer and shading treatments were met. However, contrary to our expectation of increased nitrogen fixation in the warming treatment, we observed either no change (Hylocomium) or a decrease (Aulacomnium) in fixation in the warmed plots. We hypothesize that this could be due to moss-specific responses or to long-term induced effects of the warming. For example, we observed that the soil temperature increase induced by the warming treatment was low and insignificant as vegetation height and total vascular plant cover of the warmed plots increased, and moss cover decreased. Hence, truly long-term studies lasting more than two decades provide insights on changes in key biogeochemical processes, which differ from more transient responses to warming in the Arctic.
Starting Page	695
Ending Page	706
Page Count	12
File Format	PDF
ISSN	13850237
Journal	Plant Ecology
Volume Number	213
Issue Number	4
e-ISSN	15735052
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-03-06
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aulacomnium turgidum Arctic Bryophyte Climate change Hylocomium splendens Nitrogen fixation Vegetation cover Warming Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Ecology Plant Science

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