DOI: 10.1111/gcb.12374
论文题名: Nitrogen deposition promotes the production of new fungal residues but retards the decomposition of old residues in forest soil fractions
作者: Griepentrog M. ; Bodé S. ; Boeckx P. ; Hagedorn F. ; Heim A. ; Schmidt M.W.I.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期: 1 起始页码: 327
结束页码: 340
语种: 英语
英文关键词: Amino sugars
; Biogeochemistry
; Compound-specific stable isotope analysis
; Nitrogen deposition
; Soil density fractionation
; Soil organic matter
Scopus关键词: atmospheric deposition
; biogeochemistry
; decomposition
; forest soil
; fungus
; nitrogen
; soil microorganism
; soil organic matter
; Bacteria (microorganisms)
; aminosugar
; carbon
; carbon dioxide
; nitrogen
; soil organic matter
; angiosperm
; article
; bacterium
; biogeochemistry
; chemistry
; compound-specific stable isotope analysis
; ecosystem
; fungus
; metabolism
; microbiology
; nitrogen deposition
; soil
; soil density fractionation
; spruce
; tree
; amino sugars
; biogeochemistry
; compound-specific stable isotope analysis
; nitrogen deposition
; soil density fractionation
; soil organic matter
; Amino Sugars
; Angiosperms
; Bacteria
; Carbon
; Carbon Dioxide
; Ecosystem
; Fungi
; Nitrogen
; Picea
; Soil
; Soil Microbiology
; Trees
英文摘要: Atmospheric nitrogen (N) deposition has frequently been observed to increase soil carbon (C) storage in forests, but the underlying mechanisms still remain unclear. Changes in microbial community composition and substrate use are hypothesized to be one of the key mechanisms affected by N inputs. Here, we investigated the effects of N deposition on amino sugars, which are used as biomarkers for fungal- and bacterial-derived microbial residues in soil. We made use of a 4-year combined CO2 enrichment and N deposition experiment in model forest ecosystems, providing a distinct 13C signal for 'new' and 'old' C in soil organic matter and microbial residues measured in density and particle-size fractions of soils. Our hypothesis was that N deposition decreases the amount of fungal residues in soils, with the new microbial residues being more strongly affected than old residues. The soil fractionation showed that organic matter and microbial residues are mainly stabilized by association with soil minerals in the heavy and fine fractions. Moreover, the bacterial residues are relatively enriched at mineral surfaces compared to fungal residues. The 13C tracing indicated a greater formation of fungal residues compared to bacterial residues after 4 years of experiment. In contradiction to our hypotheses, N deposition significantly increased the amount of new fungal residues in bulk soil and decreased the decomposition of old microbial residues associated with soil minerals. The preservation of old microbial residues could be due to decreased N limitation of microorganisms and therefore a reduced dependence on organic N sources. This mechanism might be especially important in fine heavy fractions with low C/N ratios, where microbial residues are effectively protected from decomposition by association with soil minerals. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62250
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, 8057, Switzerland; Department of Applied Analytical and Physical Chemistry (ISOFYS), Ghent University, Coupure Links 653, Ghent, 9000, Belgium; Forest Soils and Biogeochemistry, Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, Birmensdorf, 8903, Switzerland; Klaus Büchel Anstalt, Ingenieurbüro für Agrar- and Umweltberatung, Wegacker 5, Mauren, 9493, Liechtenstein
Recommended Citation:
Griepentrog M.,Bodé S.,Boeckx P.,et al. Nitrogen deposition promotes the production of new fungal residues but retards the decomposition of old residues in forest soil fractions[J]. Global Change Biology,2014-01-01,20(1)