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231224s2014 xx |||||o 00| ||eng c |
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|a 10.1111/gcb.12396
|2 doi
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|a pubmed24n0771.xml
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|a (NLM)24106016
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Streit, Kathrin
|e verfasserin
|4 aut
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|a Soil warming alters microbial substrate use in alpine soils
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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 11.05.2015
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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 Will warming lead to an increased use of older soil organic carbon (SOC) by microbial communities, thereby inducing C losses from C-rich alpine soils? We studied soil microbial community composition, activity, and substrate use after 3 and 4 years of soil warming (+4 °C, 2007-2010) at the alpine treeline in Switzerland. The warming experiment was nested in a free air CO2 enrichment experiment using depleted (13)CO2 (δ(13)C = -30‰, 2001-2009). We traced this depleted (13)C label in phospholipid fatty acids (PLFA) of the organic layer (0-5 cm soil depth) and in C mineralized from root-free soils to distinguish substrate ages used by soil microorganisms: fixed before 2001 ('old'), from 2001 to 2009 ('new') or in 2010 ('recent'). Warming induced a sustained stimulation of soil respiration (+38%) without decline in mineralizable SOC. PLFA concentrations did not reveal changes in microbial community composition due to soil warming, but soil microbial metabolic activity was stimulated (+66%). Warming decreased the amount of new and recent C in the fungal biomarker 18:2ω6,9 and the amount of new C mineralized from root-free soils, implying a shift in microbial substrate use toward a greater use of old SOC. This shift in substrate use could indicate an imbalance between C inputs and outputs, which could eventually decrease SOC storage in this alpine ecosystem
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Larix decidua
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|a Pinus mugo
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|a continuous 13C labeling
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|a free air CO2 enrichment (FACE)
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|a fungi
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|a gram negative bacteria
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|a gram positive bacteria
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|a phospholipid fatty acids (PLFA)
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|a soil warming
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|a Fatty Acids
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|a Phospholipids
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|a Soil
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|a Carbon
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|a 7440-44-0
|2 NLM
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|a Hagedorn, Frank
|e verfasserin
|4 aut
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|a Hiltbrunner, David
|e verfasserin
|4 aut
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|a Portmann, Magdalena
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|a Saurer, Matthias
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|a Buchmann, Nina
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|a Wild, Birgit
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|a Richter, Andreas
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|a Wipf, Sonja
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|a Siegwolf, Rolf T W
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Global change biology
|d 1999
|g 20(2014), 4 vom: 04. Apr., Seite 1327-38
|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:4
|g day:04
|g month:04
|g pages:1327-38
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|u http://dx.doi.org/10.1111/gcb.12396
|3 Volltext
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