DOI: 10.1002/2017JG004312
Scopus记录号: 2-s2.0-85042207459
论文题名: A Molecular Budget for a Peatland Based Upon 13C Solid-State Nuclear Magnetic Resonance
作者: Moody C.S. ; Worrall F. ; Clay G.D. ; Burt T.P. ; Apperley D.C. ; Rose R.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 2 起始页码: 547
结束页码: 560
语种: 英语
英文关键词: dissolved organic matter
; elemental analysis
; functional group
; particulate organic matter
Scopus关键词: biomass
; carbon cycle
; carbon sequestration
; catchment
; chemical element
; dissolved organic matter
; dry matter
; functional group
; molecular analysis
; nuclear magnetic resonance
; particulate organic matter
; peat soil
; peatland
; primary production
; soil profile
; solid
; Cumbria
; England
; Moor House National Nature Reserve
; United Kingdom
; Fungi
英文摘要: Peatlands can accumulate organic matter into long-term carbon (C) storage within the soil profile. This study used solid-state 13C nuclear magnetic resonance (13C-NMR) to investigate the transit of organic C through a peatland ecosystem to understand the molecular budget that accompanies the long-term accumulation of C. Samples of biomass, litter, peat soil profile, particulate organic matter, and dissolved organic matter (DOM) were taken from the Moor House National Nature Reserve, a peat-covered catchment in northern England where both the dry matter and C budget for the ecosystem were known. The results showed that: The interpretation of the 13C-NMR spectra shows that polysaccharides are preferentially removed through the ecosystem, while lignin components are preferentially retained and come to dominate the organic matter accumulated at depth in the profile. The DOM is derived from the oxidation of both biomass and the degradation of lignin, while the particulate organic matter is derived from erosion of the peat profile. The DOM is differentiated by its proportion of oxidized functional groups and not by its aromatic content. The changes in functionality leading to DOM production suggest side chain oxidation resulting in C-C cleavage/depolymerisation of lignin, a common reaction within white rot fungi. The 13C-NMR budget shows that O-alkyl functional groups are disproportionately lost between primary production and accumulation in the deep peat, while C-alkyl functional groups are disproportionately preserved. The carbon lost as gases (CO2 and CH4) was estimated to be composed of 93% polysaccharide-derived carbon and 7% lignin-derived carbon. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114509
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: School of Geography, University of Leeds, Leeds, United Kingdom; Department of Earth Sciences, Durham University, Science Laboratories, Durham, United Kingdom; Department of Geography, School of Environment, Education and Development, University of Manchester, Manchester, United Kingdom; Department of Geography, Durham University, Science Laboratories, Durham, United Kingdom; Department of Chemistry, Durham University, Science Laboratories, Durham, United Kingdom; Lancaster Environment Centre, Centre for Ecology and Hydrology, Lancaster, United Kingdom
Recommended Citation:
Moody C.S.,Worrall F.,Clay G.D.,et al. A Molecular Budget for a Peatland Based Upon 13C Solid-State Nuclear Magnetic Resonance[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(2)