DOI: 10.1111/gcb.12666
论文题名: Interactive effects of elevated CO2 and nitrogen deposition on fatty acid molecular and isotope composition of above- and belowground tree biomass and forest soil fractions
作者: Griepentrog M. ; Eglinton T.I. ; Hagedorn F. ; Schmidt M.W.I. ; Wiesenberg G.L.B.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 1 起始页码: 473
结束页码: 486
语种: 英语
英文关键词: Biogeochemistry
; Biomarkers
; Compound-specific stable isotope analysis
; Fatty acids
; Plant biomass
; Soil density fractionation
; Soil organic matter
Scopus关键词: Fagus
; Picea
; carbon
; carbon dioxide
; fatty acid
; reactive nitrogen species
; soil
; analysis of variance
; atmosphere
; beech
; biomass
; chemistry
; forest
; fractionation
; metabolism
; photosynthesis
; physiology
; soil
; spruce
; Analysis of Variance
; Atmosphere
; Biomass
; Carbon Dioxide
; Carbon Isotopes
; Chemical Fractionation
; Fagus
; Fatty Acids
; Forests
; Photosynthesis
; Picea
; Reactive Nitrogen Species
; Soil
英文摘要: Atmospheric carbon dioxide (CO2) and reactive nitrogen (N) concentrations have been increasing due to human activities and impact the global carbon (C) cycle by affecting plant photosynthesis and decomposition processes in soil. Large amounts of C are stored in plants and soils, but the mechanisms behind the stabilization of plant- and microbial-derived organic matter (OM) in soils are still under debate and it is not clear how N deposition affects soil OM dynamics. Here, we studied the effects of 4 years of elevated (13C-depleted) CO2 and N deposition in forest ecosystems established in open-top chambers on composition and turnover of fatty acids (FAs) in plants and soils. FAs served as biomarkers for plant- and microbial-derived OM in soil density fractions. We analyzed above- and belowground plant biomass of beech and spruce trees as well as soil density fractions for the total organic C and FA molecular and isotope (δ13C) composition. FAs did not accumulate relative to total organic C in fine mineral fractions, showing that FAs are not effectively stabilized by association with soil minerals. The δ13C values of FAs in plant biomass increased under high N deposition. However, the N effect was only apparent under elevated CO2 suggesting a N limitation of the system. In soil fractions, only isotope compositions of short-chain FAs (C16+18) were affected. Fractions of 'new' (experimental-derived) FAs were calculated using isotope depletion in elevated CO2 plots and decreased from free light to fine mineral fractions. 'New' FAs were higher in short-chain compared to long-chain FAs (C20-30), indicating a faster turnover of short-chain compared to long-chain FAs. Increased N deposition did not significantly affect the quantity of 'new' FAs in soil fractions, but showed a tendency of increased amounts of 'old' (pre-experimental) C suggesting that decomposition of 'old' C is retarded by high N inputs. © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61781
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Geography, University of Zurich, Winterthurerstrasse 190, Zurich, Switzerland; Department of Earth Sciences, Swiss Federal Institute of Technology (ETH), Sonneggstrasse 5, Zurich, Switzerland; Forest Soils and Biogeochemistry, Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, Birmensdorf, Switzerland
Recommended Citation:
Griepentrog M.,Eglinton T.I.,Hagedorn F.,et al. Interactive effects of elevated CO2 and nitrogen deposition on fatty acid molecular and isotope composition of above- and belowground tree biomass and forest soil fractions[J]. Global Change Biology,2015-01-01,21(1)