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231224s2014 xx |||||o 00| ||eng c |
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|a 10.1111/gcb.12422
|2 doi
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|a pubmed25n0772.xml
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|a (DE-627)NLM231599153
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|a (NLM)24115224
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
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|a Gundale, Michael J
|e verfasserin
|4 aut
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|a Anthropogenic nitrogen deposition in boreal forests has a minor impact on the global carbon cycle
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|c 2014
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 21.08.2014
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|a Date Revised 16.11.2017
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2013 John Wiley & Sons Ltd.
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|a It is proposed that increases in anthropogenic reactive nitrogen (Nr ) deposition may cause temperate and boreal forests to sequester a globally significant quantity of carbon (C); however, long-term data from boreal forests describing how C sequestration responds to realistic levels of chronic Nr deposition are scarce. Using a long-term (14-year) stand-scale (0.1 ha) N addition experiment (three levels: 0, 12.5, and 50 kg N ha(-1) yr(-1) ) in the boreal zone of northern Sweden, we evaluated how chronic N additions altered N uptake and biomass of understory communities, and whether changes in understory communities explained N uptake and C sequestration by trees. We hypothesized that understory communities (i.e. mosses and shrubs) serve as important sinks for low-level N additions, with the strength of these sinks weakening as chronic N addition rates increase, due to shifts in species composition. We further hypothesized that trees would exhibit nonlinear increases in N acquisition, and subsequent C sequestration as N addition rates increased, due to a weakening understory N sink. Our data showed that understory biomass was reduced by 50% in response to the high N addition treatment, mainly due to reduced moss biomass. A (15) N labeling experiment showed that feather mosses acquired the largest fraction of applied label, with this fraction decreasing as the chronic N addition level increased. Contrary to our hypothesis, the proportion of label taken up by trees was equal (ca. 8%) across all three N addition treatments. The relationship between N addition and C sequestration in all vegetation pools combined was linear, and had a slope of 16 kg C kg(-1) N. While canopy retention of Nr deposition may cause C sequestration rates to be slightly different than this estimate, our data suggest that a minor quantity of annual anthropogenic CO2 emissions are sequestered into boreal forests as a result of Nr deposition
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a 15N labeling
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|a Nitrogen deposition
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|a carbon sequestration
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|a carbon sink
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|a dwarf shrubs
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| 650 |
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4 |
|a feather mosses
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| 650 |
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|a productivity
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| 650 |
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|a soil nitrogen uptake
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| 650 |
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|a understory vegetation
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| 650 |
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|a Soil
|2 NLM
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| 650 |
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|a Nitrogen
|2 NLM
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| 650 |
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|a N762921K75
|2 NLM
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| 700 |
1 |
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|a From, Fredrik
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Bach, Lisbet H
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Nordin, Annika
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Global change biology
|d 1999
|g 20(2014), 1 vom: 04. Jan., Seite 276-86
|w (DE-627)NLM098239996
|x 1365-2486
|7 nnns
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| 773 |
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|g volume:20
|g year:2014
|g number:1
|g day:04
|g month:01
|g pages:276-86
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|u http://dx.doi.org/10.1111/gcb.12422
|3 Volltext
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