| DOI: | 10.1016/j.quascirev.2018.11.002
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| Scopus记录号: | 2-s2.0-85056889053
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| 论文题名: | Identifying the ‘savanna’ signature in lacustrine sediments in northern Australia |
| 作者: | Bird M.I.; Brand M.; Diefendorf A.F.; Haig J.L.; Hutley L.B.; Levchenko V.; Ridd P.V.; Rowe C.; Whinney J.; Wurster C.M.; Zwart C.
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| 刊名: | Quaternary Science Reviews
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| ISSN: | 2773791
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| 出版年: | 2019
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| 卷: | 203 | | 起始页码: | 233
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| 结束页码: | 247
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| 语种: | 英语
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| 英文关键词: | Continental biomarkers
; Palaeoecology
; Paleoclimatology
; Palynology
; Quaternary
; Radiocarbon
; Southern Pacific
; Stable isotope
; Vegetation dynamics
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| Scopus关键词: | Charcoal
; Fires
; Geochemistry
; Isotopes
; Land use
; Organic carbon
; Paraffins
; Rain
; Vegetation
; Palaeoecology
; Paleoclimatology
; Palynology
; Quaternary
; Radiocarbon
; Southern Pacific
; Stable isotopes
; Vegetation dynamics
; Sediments
; biomarker
; carbon isotope
; charcoal
; Holocene
; land use change
; paleoclimate
; paleoecology
; palynology
; Quaternary
; radiocarbon dating
; rainfall
; savanna
; total organic carbon
; vegetation cover
; vegetation dynamics
; Australia
; Pacific Ocean
; Pacific Ocean (South)
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| 英文摘要: | This study reports palynological and geochemical results for modern and ancient sediments from 19 lakes on a rainfall gradient (784–1880 mm), across a range of savannas in Northern Australia. All proxies varied significantly across the range of sites examined, providing a robust envelope of values that can reliably be employed to identify a savanna signature in the sedimentary record. While the results indicate it is possible to identify a savanna, we found only three statistically significant relationships between any proxy measured in surface sediments and the major climate driver of savanna vegetation composition (rainfall amount). This is because edaphic factors play a dominant role in determining vegetation composition and also potentially because of the impact of land use change. Measures of fire determined by charcoal counting were positively correlated with geochemical measures of pyrogenic carbon abundance, suggesting both record a similar signal. While measures of fire incidence were not correlated with rainfall, there was a significant positive correlation between charcoal abundance and number of fires early in the dry season, suggesting that charcoal abundance is controlled more by the number/timing of fires than climate. There was also a significant correlation between the δ13C-value of pyrogenic carbon and tree:grass ratio derived from palynological indicators, indicating that the δ13C-value of PyC is a reliable indicator of savanna ‘woodiness’. Comparison of the carbon isotope composition of total organic carbon, PyC and n-alkanes between modern and Holocene sediments suggest that the savannas of the region have remained either similar in ‘woodiness’ or have thickened over the last millennia. © 2018 Elsevier Ltd |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/117434
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| Appears in Collections: | 气候变化与战略
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| Recommended Citation: | |
Bird M.I.,Brand M.,Diefendorf A.F.,et al. Identifying the ‘savanna’ signature in lacustrine sediments in northern Australia[J]. Quaternary Science Reviews,2019-01-01,203
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