Sustained wood burial in the Bengal Fan over the last 19 My

doi:10.1073/pnas.1913714116

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	Sustained wood burial in the Bengal Fan over the last 19 My
	Lee, Hyejung ; Galy, Valier 3; Feng, Xiaojuan 4; Ponton, Camilo 1; Galy, Albert ; France-Lanord, Christian ; Feakins, Sarah J.
刊名	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
	2019
卷号	116 期号:45 页码:22518-22525
关键词	carbon cycle wood lignin Himalaya Bengal Fan
ISSN号	0027-8424
DOI	10.1073/pnas.1913714116
文献子类	Article
英文摘要	The Ganges-Brahmaputra (G-B) River system transports over a billion tons of sediment every year from the Himalayan Mountains to the Bay of Bengal and has built the world's largest active sedimentary deposit, the Bengal Fan. High sedimentation rates drive exceptional organic matter preservation that represents a long-term sink for atmospheric CO2. While much attention has been paid to organic-rich fine sediments, coarse sediments have generally been overlooked as a locus of organic carbon (OC) burial. However, International Ocean Discovery Program Expedition 354 recently discovered abundant woody debris (millimeter- to centimeter-sized fragments) preserved within the coarse sediment layers of turbidite beds recovered from 6 marine drill sites along a transect across the Bengal Fan (similar to 8 degrees N, similar to 3,700-m water depth) with recovery spanning 19 My. Analysis of bulk wood and lignin finds mostly lowland origins of wood delivered episodically. In the last 5 My, export included C-4 plants, implying that coarse woody, lowland export continued after C-4 grassland expansion, albeit in reduced amounts. Substantial export of coarse woody debris in the last 1 My included one wood-rich deposit (similar to 0.05 Ma) that encompassed coniferous wood transported from the headwaters. In coarse layers, we found on average 0.16 weight % OC, which is half the typical biospheric OC content of sediments exported by the modern G-B Rivers. Wood burial estimates are hampered by poor drilling recovery of sands. However, high-magnitude, low-frequency wood export events are shown to be a key mechanism for C burial in turbidites.
学科主题	Multidisciplinary Sciences
出版地	WASHINGTON
WOS关键词	PARTICULATE ORGANIC-CARBON ; LIGNIN METHOXYL GROUPS ; LAKE OUTBURST FLOODS ; MARINE-SEDIMENTS ; ATMOSPHERIC CO2 ; TSANGPO RIVER ; PLANT ; BASIN ; WATER ; PRESERVATION
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	NATL ACAD SCIENCES
WOS记录号	WOS:000494457400024
资助机构	National Science FoundationNational Science Foundation (NSF) [OCE-1401217, COL-T354A55, OCE-1400805] ; University of Southern California Provost's Fellowship ; IODP-France
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/19688]
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.Univ Lorraine, CNRS, Ctr Rech Petrograph & Geochim, F-54506 Vandoeuvre Les Nancy, France 3.[Lee, Hyejung; Ponton, Camilo; Feakins, Sarah J.] Univ Southern Calif, Dept Earth Sci, Los Angeles, CA 90089 USA 4.Woods Hole Oceanog Inst, Dept Marine Chem & Geochem, Woods Hole, MA 02543 USA 5.Western Washington Univ, Dept Geol, Bellingham, WA 98225 USA
推荐引用方式 GB/T 7714	Lee, Hyejung,Galy, Valier,Feng, Xiaojuan,et al. Sustained wood burial in the Bengal Fan over the last 19 My[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2019,116(45):22518-22525.
APA	Lee, Hyejung.,Galy, Valier.,Feng, Xiaojuan.,Ponton, Camilo.,Galy, Albert.,...&Feakins, Sarah J..(2019).Sustained wood burial in the Bengal Fan over the last 19 My.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,116(45),22518-22525.
MLA	Lee, Hyejung,et al."Sustained wood burial in the Bengal Fan over the last 19 My".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 116.45(2019):22518-22525.