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Climatic modifiers of the response to nitrogen deposition in peat-forming Sphagnum mosses : a meta-analysis

Limpens, J. (author)
Granath, Gustaf (author)
Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Uppsala universitet,Växtekologi och evolution,Institutionen för vatten och miljö,Department of Aquatic Sciences and Assessment
Gunnarsson, Urban (author)
Uppsala universitet,Växtekologi och evolution
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Aerts, R. (author)
Bayley, S. (author)
Bragazza, L. (author)
Bubier, J. (author)
Buttler, A. (author)
van den Berg, L. J. L. (author)
Francez, A-J (author)
Gerdol, R. (author)
Grosvernier, P. (author)
Heijmans, M. M. P. D. (author)
Hoosbeek, M. R. (author)
Hotes, S. (author)
Ilomets, M. (author)
Leith, I. (author)
Mitchell, E. A. D. (author)
Moore, T. (author)
Nilsson, Mats (author)
Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management
Nordbakken, J-F (author)
Rochefort, L. (author)
Rydin, Håkan (author)
Uppsala universitet,Växtekologi och evolution
Sheppard, L. J. (author)
Thormann, M. (author)
Wiedermann, M. M. (author)
Williams, B. L. (author)
Xu, B. (author)
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 (creator_code:org_t)
 
2011-03-22
2011
English.
In: New Phytologist. - : Wiley. - 0028-646X .- 1469-8137. ; 191:2, s. 496-507
Related links:
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https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Peatlands in the northern hemisphere have accumulated more atmospheric carbon (C) during the Holocene than any other terrestrial ecosystem, making peatlands long-term C sinks of global importance. Projected increases in nitrogen (N) deposition and temperature make future accumulation rates uncertain. Here, we assessed the impact of N deposition on peatland C sequestration potential by investigating the effects of experimental N addition on Sphagnum moss. We employed meta-regressions to the results of 107 field experiments, accounting for sampling dependence in the data. We found that high N loading (comprising N application rate, experiment duration, background N deposition) depressed Sphagnum production relative to untreated controls. The interactive effects of presence of competitive vascular plants and high tissue N concentrations indicated intensified biotic interactions and altered nutrient stochiometry as mechanisms underlying the detrimental N effects. Importantly, a higher summer temperature (mean for July) and increased annual precipitation intensified the negative effects of N. The temperature effect was comparable to an experimental application of almost 4 g N m(-2) yr(-1) for each 1 degrees C increase. Our results indicate that current rates of N deposition in a warmer environment will strongly inhibit C sequestration by Sphagnum-dominated vegetation.

Subject headings

LANTBRUKSVETENSKAPER  -- Annan lantbruksvetenskap -- Miljö- och naturvårdsvetenskap (hsv//swe)
AGRICULTURAL SCIENCES  -- Other Agricultural Sciences -- Environmental Sciences related to Agriculture and Land-use (hsv//eng)

Keyword

carbon
climate
global change
meta-regression
nitrogen
peatlands
productivity
Sphagnum
NATURAL SCIENCES
NATURVETENSKAP

Publication and Content Type

ref (subject category)
art (subject category)

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