NDLI: Experimental Warming Alters Productivity and Isotopic Signatures of Tundra Mosses

Content Provider	Springer Nature Link
Author	Deane Coe, Kirsten K. Mauritz, Marguerite Celis, Gerardo Salmon, Verity Crummer, Kathryn G. Natali, Susan M. Schuur, Edward A. G.
Copyright Year	2015
Abstract	In the tundra, mosses play an important functional role regulating belowground and ecosystem processes, but there is still considerable uncertainty about how tundra moss communities will respond to climate change. We examined the effects of 5 years of in situ air and soil warming on net primary productivity (NPP), carbon (C) and nitrogen (N) isotope signatures (δ13C and δ15N), and C:N in dominant Alaskan tundra mosses. Air warming increased mean air temperatures by up to 0.5°C and resulted in an 80–90% reduction in NPP in the feather moss Pleurozium and the peat moss Sphagnum. Soil warming increased permafrost thaw depth by 12–18%, upper soil water content by 23–27%, and resulted in a threefold increase in Sphagnum NPP. δ13C was positively correlated with moss NPP, and increased by 0.5–1‰ in all mosses under soil warming. C:N was reduced in Sphagnum and Pleurozium, due to increases in tissue %N in the soil warming treatment, suggesting that moss N availability could increase as temperatures increases. Higher N availability in warmer conditions, however, may be offset by unfavorable moisture conditions for moss growth. Similar to responses in tundra vascular plant communities, our results forecast interspecific differences in productivity among tundra mosses. Specifically, air warming may reduce productivity in Sphagnum and Pleurozium, but soil warming could offset this response in Sphagnum. Such responses may lead to changes in tundra moss community structure and function as temperatures increase that have the potential to alter tundra C and N cycling in a future climate.
Starting Page	1070
Ending Page	1082
Page Count	13
File Format	PDF
ISSN	14329840
Journal	Ecosystems
Volume Number	18
Issue Number	6
e-ISSN	14350629
Language	English
Publisher	Springer US
Publisher Date	2015-05-20
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	global change permafrost bryophytes Sphagnum Pleurozium Dicranum NPP δ13C δ15N Ecology Plant Sciences Zoology Environmental Management Geoecology/Natural Processes Hydrology/Water Resources
Content Type	Text
Resource Type	Article
Subject	Ecology Environmental Chemistry Ecology, Evolution, Behavior and Systematics

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Experimental Warming Alters Productivity and Isotopic Signatures of Tundra Mosses

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