干旱区生态环境知识资源中心(Arid): Palaeochannels of Australia's Riverine Plain - Reconstructing past vegetation environments across the Late Pleistocene and Holocene

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DOI	10.1016/j.palaeo.2019.109533
	Palaeochannels of Australia's Riverine Plain - Reconstructing past vegetation environments across the Late Pleistocene and Holocene
	Forbes, Matt 1,3,6; Jankowski, Nathan 1,3,5; Cohen, Tim 1,2,3; Hopf, Felicitas 1,7; Mueller, Daniela 4; Bird, Michael 1,8; Haberle, Simon 1,7; Jacobs, Zenobia 1,3,5
通讯作者	Forbes, Matt
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN	0031-0182
EISSN	1872-616X
出版年	2020
卷号	545
英文摘要	Riverine Plain palaeochannels record periods of fluvial activity for Late Pleistocene southeastern Australia. In an attempt to develop a more detailed palaeoenvironmental record for this semi-arid region, we investigate the fine overbank sediments of the palaeochannel fill that cap and underlie the coarser-grained fluvial channel sands of the Tombullen (41-29 thousand years (ka) ago) and the Yanco (29-18 ka) phases. New single grain Optically Stimulated Luminescence (OSL) age determinations for the overlying palaeochannel fills suggest an overall slowing of sedimentation rates since the phase of fluvial activity in late Marine Isotope Stages 3 and 2. delta C-13(TOC) data for the palaeochannel fill sediments range between -28 parts per thousand and -22 parts per thousand, implying variable C4 contributions (0-40%) to a predominantly C3 vegetation mosaic. Modelled C4 abundance for the last 50 thousand years (kyr) decreased from 40% to 10% at around 40 ka with predicted representation remaining low towards the Last Glacial Maximum (LGM). Post LGM C4 grasses are seen to expand to 30-40% and sustained through the Holocene. Pollen preservation is restricted to the upper two metres of the cores, with the distribution showing shifts in dominance from Poaceae and Asteraceae to Eucalyptus up sequence. Increasing Eucalyptus/Poaceae ratios correspond with increasing C4 abundance suggesting that as woodland expanded in the Holocene the associated decreasing grass component shifted from C3 to C4. However, some evidence for the persistence of Poaceae and/or Asteraceae dominance argues that the likely shift from C3 to C4 grasses during the Holocene was in places independent of expanding woodland. Bulk sediment elemental ratios reveal wetting and drying cycles during the deposition of the overbank deposits. While these traits appear to be a product of local sedimentation changes, rather than regional climate, our model of C4 contraction and subsequent expansion across the last 50 kyr is likely reflecting changing summer monsoon intensity and its effects on regional aridity.
英文关键词	Palaeochannels Murray Darling Basin Carbon isotopes Optically stimulated luminescence C4 grasses Last Glacial Maximum
类型	Article
语种	英语
国家	Australia ; Germany
收录类别	SCI-E
WOS记录号	WOS:000526825900017
WOS关键词	NEW-SOUTH-WALES ; LATE QUATERNARY VEGETATION ; LAST GLACIAL MAXIMUM ; MURRAY-DARLING BASIN ; SOUTHEASTERN AUSTRALIA ; ORGANIC-MATTER ; GLOBAL DISTRIBUTION ; MURRUMBIDGEE RIVER ; HUMAN COLONIZATION ; CARBON ISOTOPES
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS研究方向	Physical Geography ; Geology ; Paleontology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315279
作者单位	1.Univ Wollongong, ARC Ctr Excellence Australian Biodivers & Heritag, Wollongong, NSW, Australia; 2.Univ Wollongong, GeoQuest Res Ctr, Wollongong, NSW, Australia; 3.Univ Wollongong, Sch Earth Atmosphere & Life Sci, Wollongong, NSW 2522, Australia; 4.Albert Ludwigs Univ, Inst Earth & Environm Sci, Freiburg, Germany; 5.Univ Wollongong, Sch Earth & Environm Sci, Ctr Archaeol Sci, Wollongong, NSW, Australia; 6.Univ New South Wales, Sch Biol Earth & Environm Sci, Sydney, NSW, Australia; 7.Australian Natl Univ, Coll Asia & Pacific, Canberra, ACT, Australia; 8.James Cook Univ, Coll Sci & Engn, Ctr Trop Environm & Sustainabil Sci, Cairns, Qld, Australia
推荐引用方式 GB/T 7714	Forbes, Matt,Jankowski, Nathan,Cohen, Tim,et al. Palaeochannels of Australia's Riverine Plain - Reconstructing past vegetation environments across the Late Pleistocene and Holocene[J],2020,545.
APA	Forbes, Matt.,Jankowski, Nathan.,Cohen, Tim.,Hopf, Felicitas.,Mueller, Daniela.,...&Jacobs, Zenobia.(2020).Palaeochannels of Australia's Riverine Plain - Reconstructing past vegetation environments across the Late Pleistocene and Holocene.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,545.
MLA	Forbes, Matt,et al."Palaeochannels of Australia's Riverine Plain - Reconstructing past vegetation environments across the Late Pleistocene and Holocene".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 545(2020).