DOI: 10.1111/gcb.12497
论文题名: Lignin decomposition along an Alpine elevation gradient in relation to physicochemical and soil microbial parameters
作者: Duboc O. ; Dignac M.-F. ; Djukic I. ; Zehetner F. ; Gerzabek M.H. ; Rumpel C.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期: 7 起始页码: 2272
结束页码: 2285
语种: 英语
英文关键词: Compound-specific isotope analysis
; Cupric oxide
; Histosols
; Lignin
; PLFA
; Soil microbial communities
; Soil organic matter
Scopus关键词: alpine environment
; carbon isotope
; climate change
; community composition
; decomposition
; global climate
; isotopic analysis
; lignin
; microbial community
; physicochemical property
; soil microorganism
; soil organic matter
; Zea mays
; carbon
; carbon
; copper
; cupric oxide
; lignin
; phenol derivative
; soil
; altitude
; chemistry
; climate change
; maize
; metabolism
; microbiology
; season
; soil
; temperature
; Altitude
; Carbon
; Carbon Isotopes
; Climate Change
; Copper
; Lignin
; Phenols
; Seasons
; Soil
; Soil Microbiology
; Temperature
; Zea mays
英文摘要: Lignin is an aromatic plant compound that decomposes more slowly than other organic matter compounds; however, it was recently shown that lignin could decompose as fast as litter bulk carbon in minerals soils. In alpine Histosols, where organic matter dynamics is largely unaffected by mineral constituents, lignin may be an important part of soil organic matter (SOM). These soils are expected to experience alterations in temperature and/or physicochemical parameters as a result of global climate change. The effect of these changes on lignin dynamics remains to be examined and the importance of lignin as SOM compound in these soils evaluated. Here, we investigated the decomposition of individual lignin phenols of maize litter incubated for 2 years in-situ in Histosols on an Alpine elevation gradient (900, 1300, and 1900 m above sea level); to this end, we used the cupric oxide oxidation method and determined the phenols' 13C signature. Maize lignin decomposed faster than bulk maize carbon in the first year (86 vs. 78% decomposed); however, after the second year, lignin and bulk C decomposition did not differ significantly. Lignin mass loss did not correlate with soil temperature after the first year, and even correlated negatively at the end of the second year. Lignin mass loss also correlated negatively with the remaining maize N at the end of the second year, and we interpreted this result as a possible negative influence of nitrogen on lignin degradation, although other factors (notably the depletion of easily degradable carbon sources) may also have played a role at this stage of decomposition. Microbial community composition did not correlate with lignin mass loss, but it did so with the lignin degradation indicators (Ac/Al)s and S/V after 2 years of decomposition. Progressing substrate decomposition toward the final stages thus appears to be linked with microbial community differentiation. © 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/62046
Appears in Collections: 影响、适应和脆弱性
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作者单位: Institute of Soil Research, University of Natural Resources and Life Sciences, Peter-Jordan-Str. 82, A-1190, Vienna, Austria; Biogeochemistry and Ecology of Continental Ecosystems (BioEMCo), UMR CNRS, UPMC, Centre AgroParisTech-INRA, Bâtiment EGER, Thiverval-Grignon, F-78850, France
Recommended Citation:
Duboc O.,Dignac M.-F.,Djukic I.,et al. Lignin decomposition along an Alpine elevation gradient in relation to physicochemical and soil microbial parameters[J]. Global Change Biology,2014-01-01,20(7)