globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.12396
论文题名:
Soil warming alters microbial substrate use in alpine soils
作者: Streit K.; Hagedorn F.; Hiltbrunner D.; Portmann M.; Saurer M.; Buchmann N.; Wild B.; Richter A.; Wipf S.; Siegwolf R.T.W.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期:4
起始页码: 1327
结束页码: 1338
语种: 英语
英文关键词: Continuous 13C labeling ; Free air CO2 enrichment (FACE) ; Fungi ; Gram negative bacteria ; Gram positive bacteria ; Larix decidua ; Phospholipid fatty acids (PLFA) ; Pinus mugo ; Soil warming
Scopus关键词: alpine environment ; biomarker ; microbial activity ; microbial community ; phospholipid ; soil carbon ; soil organic matter ; substrate preference ; warming ; Fungi ; Larix ; Larix decidua ; Negibacteria ; Pinus mugo ; Posibacteria ; carbon ; fatty acid ; phospholipid ; soil ; biomass ; chemistry ; ecosystem ; Larix ; metabolism ; microbial consortium ; microbiology ; pine ; soil ; Switzerland ; temperature ; Biomass ; Carbon ; Ecosystem ; Fatty Acids ; Larix ; Microbial Consortia ; Phospholipids ; Pinus ; Soil ; Soil Microbiology ; Switzerland ; Temperature
英文摘要: 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 13CO2 (δ13C = -30‰, 2001-2009). We traced this depleted 13C 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. © 2013 John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61961
Appears in Collections:影响、适应和脆弱性

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作者单位: Paul Scherrer Institute (PSI), Laboratory of Atmospheric Chemistry, Villigen PSI 5232, Switzerland; Forest Soils and Biogeochemistry, Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, Birmensdorf 8903, Switzerland; Nova Energie Basel AG, Schönaustrasse 35, Basel 4058, Switzerland; Institute of Agricultural Sciences, ETH Zürich, Universitätsstrasse 2, Zürich 8092, Switzerland; Division of Terrestrial Ecosystem Research, Department of Microbiology and Ecosystem Science, University of Vienna, Althanstrasse 14, Vienna 1090, Austria; Community Ecology, Mountain Ecosystems, WSL Institute for Snow and Avalanche Research (SLF), Flüelastrasse 11, Davos Dorf, CH-7260, Switzerland

Recommended Citation:
Streit K.,Hagedorn F.,Hiltbrunner D.,et al. Soil warming alters microbial substrate use in alpine soils[J]. Global Change Biology,2014-01-01,20(4)
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