Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s10933-010-9466-9 |
Molecular fingerprinting of wetland organic matter using pyrolysis-GC/MS: an example from the southern Cape coastline of South Africa | |
Carr, Andrew S.1; Boom, Arnoud1; Chase, Brian M.2; Roberts, David L.3; Roberts, Zoe E.1 | |
通讯作者 | Carr, Andrew S. |
来源期刊 | JOURNAL OF PALEOLIMNOLOGY
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ISSN | 0921-2728 |
出版年 | 2010 |
卷号 | 44期号:4页码:947-961 |
英文摘要 | Pyrolysis-gas chromatography mass spectrometry (py-GC/MS) allows the characterisation of complex macromolecular organic matter. In lakes and wetlands this can potentially be used to assess the preservation/diagenesis and provenance of sediment organic matter. It can complement palaeoenvironmental investigations utilising ’bulk’ sediment variables such as total organic carbon (TOC) and TOC/total nitrogen ratios. We applied py-GC/MS analyses to a similar to 32,000-year sediment record from the southern Cape coastline of South Africa. We used the results to evaluate the sources and extent of degradation of organic matter in this semi-arid environment. Marked down-core changes in the relative abundance of multiple pyrolysis products were observed. Correspondence analysis revealed that the major driver of this down-core variability in OM composition was selective preservation/degradation. Samples comprising highly degraded OM are primarily confined to the lower half of the core, older than similar to 12,000 years, and are characterised by suites of low-molecular-weight aromatic pyrolysis products. Samples rich in organic matter, e.g. surface sediments, are characterised by products derived from fresh emergent or terrestrial vegetation, which include lignin monomers, plant-derived fatty acids and long-chain n-alkanes. Pyrolysates from the late glacial-early Holocene period, approximately mid-way down the core are characterised by distinct suites of long-chain n-alkene/n-alkane doublets, which may reflect the selective preservation of recalcitrant aliphatic macromolecules and/or enhanced inputs of the algal macromolecule algaenan/polymerised algal lipids. Increased TOC, lower delta(13)C and increased abundance of more labile lignin and fatty acid products at the same depths suggest this period was associated with increased lake primary productivity and enhanced inputs of terrestrial OM. TOC is the only ’bulk’ parameter correlated with the correspondence analysis axes extracted from the py-GC/MS data. Distinct fluctuations in TOC/total nitrogen ratio are not explained by variation in organo-nitrogen pyrolysis products. Notwithstanding, the study suggests that py-GC/MS has potential to complement palaeolimnological investigations, particularly in regions such as southern Africa, where other paleoenvironmental proxy variables in sediments may be lacking or equivocal. |
英文关键词 | Py-GC/MS Biomarker Quaternary, Diagenesis Lignin |
类型 | Article |
语种 | 英语 |
国家 | England ; Norway ; South Africa |
收录类别 | SCI-E |
WOS记录号 | WOS:000283360800005 |
WOS关键词 | GAS CHROMATOGRAPHY/MASS SPECTROMETRY ; WINTER-RAINFALL ZONE ; CHEMICAL-CHARACTERIZATION ; MASS-SPECTROMETRY ; NMR-SPECTROSCOPY ; LAKE-SEDIMENTS ; FOREST SOIL ; HUMIC ACIDS ; C-13 NMR ; NW SPAIN |
WOS类目 | Environmental Sciences ; Geosciences, Multidisciplinary ; Limnology |
WOS研究方向 | Environmental Sciences & Ecology ; Geology ; Marine & Freshwater Biology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/165398 |
作者单位 | 1.Univ Leicester, Dept Geog, Leicester LE1 7RH, Leics, England; 2.Univ Bergen, Dept Archaeol Hist Cultural Studies & Relig, N-5020 Bergen, Norway; 3.Council Geosci, Cape Town, South Africa |
推荐引用方式 GB/T 7714 | Carr, Andrew S.,Boom, Arnoud,Chase, Brian M.,et al. Molecular fingerprinting of wetland organic matter using pyrolysis-GC/MS: an example from the southern Cape coastline of South Africa[J],2010,44(4):947-961. |
APA | Carr, Andrew S.,Boom, Arnoud,Chase, Brian M.,Roberts, David L.,&Roberts, Zoe E..(2010).Molecular fingerprinting of wetland organic matter using pyrolysis-GC/MS: an example from the southern Cape coastline of South Africa.JOURNAL OF PALEOLIMNOLOGY,44(4),947-961. |
MLA | Carr, Andrew S.,et al."Molecular fingerprinting of wetland organic matter using pyrolysis-GC/MS: an example from the southern Cape coastline of South Africa".JOURNAL OF PALEOLIMNOLOGY 44.4(2010):947-961. |
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