NDLI: N2-Fixing Red Alder Indirectly Accelerates Ecosystem Nitrogen Cycling

Content Provider	Springer Nature Link
Author	Perakis, Steven S. Matkins, Joselin J. Hibbs, David E.
Copyright Year	2012
Abstract	Symbiotic N2-fixing tree species can accelerate ecosystem N dynamics through decomposition feedbacks via both direct and indirect pathways. Direct pathways include the production of readily decomposed leaf litter and increased N supply to decomposers, whereas indirect pathways include increased tissue N and altered detrital dynamics of non-fixing vegetation. To evaluate the relative importance of direct and indirect pathways, we compared 3-year decomposition and N dynamics of N2-fixing red alder leaf litter (2.34% N) to both low-N (0.68% N) and high-N (1.21% N) litter of non-fixing Douglas-fir, and decomposed each litter source in four forests dominated by either red alder or Douglas-fir. We also used experimental N fertilization of decomposition plots to assess elevated N availability as a potential mechanism of N2-fixer effects on litter mass loss and N dynamics. Direct effects of N2-fixing red alder on decomposition occurred primarily as faster N release from red alder than Douglas-fir litter. Direct increases in N supply to decomposers via experimental N fertilization did not stimulate decomposition of either species litter. Fixed N indirectly influenced detrital dynamics by increasing Douglas-fir tissue and litter N concentrations, which accelerated litter N release without accelerating mass loss. By increasing soil N, tissue N, and the rate of N release from litter of non-fixers, we conclude that N2-fixing vegetation can indirectly foster plant–soil feedbacks that contribute to the persistence of elevated N availability in terrestrial ecosystems.
Starting Page	1182
Ending Page	1193
Page Count	12
File Format	PDF
ISSN	14329840
Journal	Ecosystems
Volume Number	15
Issue Number	7
e-ISSN	14350629
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-07-28
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Alnus rubra decomposition feedback N fertilization nitrogen fixation Pseudotsuga menziesii Environmental Management Ecology Nature Conservation Geoecology/Natural Processes Plant Sciences Zoology
Content Type	Text
Resource Type	Article
Subject	Ecology Environmental Chemistry Ecology, Evolution, Behavior and Systematics

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Erratum to: N2-Fixing Red Alder Indirectly Accelerates Ecosystem Nitrogen Cycling

Nitrogen fixation by scotch broom (Cytisus scoparius L.) and red alder (Alnus rubra Bong.) planted under precommercially thinned Douglas fir (Pseudotsuga menziesii (Mirb.) Franco)

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