DOI: 10.1111/gcb.12342
论文题名: Temperature response of litter and soil organic matter decomposition is determined by chemical composition of organic material
作者: Erhagen B. ; Öquist M. ; Sparrman T. ; Haei M. ; Ilstedt U. ; Hedenström M. ; Schleucher J. ; Nilsson M.B.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 12 起始页码: 3858
结束页码: 3871
语种: 英语
英文关键词: CO2
; CP-MAS NMR
; Decomposition
; Forest
; Litter
; Organic chemical composition
; Q10
; Soil organic matter
; Temperature sensitivity
Scopus关键词: carbon dioxide
; chemical composition
; decomposition
; ecosystem modeling
; forest soil
; litter
; nuclear magnetic resonance
; soil carbon
; soil organic matter
; temperature effect
; carbon dioxide
; soil organic matter
; article
; chemistry
; climate change
; CP-MAS NMR
; decomposition
; ecosystem
; forest
; humic substance
; litter
; metabolism
; nuclear magnetic resonance spectroscopy
; organic chemical composition
; soil
; Sweden
; temperature
; temperature sensitivity
; CO2
; CP-MAS NMR
; decomposition
; forest
; litter
; organic chemical composition
; soil organic matter
; temperature sensitivity
; Carbon Dioxide
; Climate Change
; Ecosystem
; Humic Substances
; Magnetic Resonance Spectroscopy
; Soil
; Sweden
; Temperature
英文摘要: The global soil carbon pool is approximately three times larger than the contemporary atmospheric pool, therefore even minor changes to its integrity may have major implications for atmospheric CO2 concentrations. While theory predicts that the chemical composition of organic matter should constitute a master control on the temperature response of its decomposition, this relationship has not yet been fully demonstrated. We used laboratory incubations of forest soil organic matter (SOM) and fresh litter material together with NMR spectroscopy to make this connection between organic chemical composition and temperature sensitivity of decomposition. Temperature response of decomposition in both fresh litter and SOM was directly related to the chemical composition of the constituent organic matter, explaining 90% and 70% of the variance in Q10 in litter and SOM, respectively. The Q10 of litter decreased with increasing proportions of aromatic and O-aromatic compounds, and increased with increased contents of alkyl- and O-alkyl carbons. In contrast, in SOM, decomposition was affected only by carbonyl compounds. To reveal why a certain group of organic chemical compounds affected the temperature sensitivity of organic matter decomposition in litter and SOM, a more detailed characterization of the 13C aromatic region using Heteronuclear Single Quantum Coherence (HSQC) was conducted. The results revealed considerable differences in the aromatic region between litter and SOM. This suggests that the correlation between chemical composition of organic matter and the temperature response of decomposition differed between litter and SOM. The temperature response of soil decomposition processes can thus be described by the chemical composition of its constituent organic matter, this paves the way for improved ecosystem modeling of biosphere feedbacks under a changing climate. © 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/62273
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Skogsmarksgränd, Umeå, SE-901 83, Sweden; Department of Chemistry, Umeå University, Umeå, SE-901 87, Sweden; Department of Medical Biochemistry and Biophysics, Umeå University, Umeå, SE-901 87, Sweden
Recommended Citation:
Erhagen B.,Öquist M.,Sparrman T.,et al. Temperature response of litter and soil organic matter decomposition is determined by chemical composition of organic material[J]. Global Change Biology,2013-01-01,19(12)