Diagnosis of river basins as CO2 sources or sinks subject to sediment   movement

doi:10.1002/esp.3254

CORC > 北京大学 > 环境科学与工程学院

	Diagnosis of river basins as CO2 sources or sinks subject to sediment movement
	Yue, Yao ; Ni, Jinren ; Borthwick, Alistair G. L. ; Miao, Chiyuan
刊名	earth surface processes and landforms
	2012
关键词	CO2 flux sediment erosion transport AGRICULTURAL SOIL-EROSION GLOBAL CARBON-CYCLE ORGANIC-CARBON DIOXIDE EVOLUTION IMPACT DEPOSITION FLUXES CHINA REDISTRIBUTION SEQUESTRATION
DOI	10.1002/esp.3254
英文摘要	Sediment movement during erosion, transport and deposition greatly affects the ecosystem of river basins. However, there is presently no consensus as to whether particular river basins act as carbon dioxide (CO2) sources or sinks related to these processes. This paper introduces a rule-of-thumb coordinate system based on sediment delivery ratio (SDR) and soil humin content (SHC) in order to evaluate the net effect of soil erosion, sediment transport and deposition on CO2 flux in river basins. The SDRSHC system delineates CO2 source and sink areas, and further divides the sink into strong and weak areas according to the world-average line. The Yellow River Basin, most severely suffering soil erosion in the world, only appears to be a weak erosion-induced CO2 sink in this system. The average annual CO2 sequestration is similar to 0.235 Mt from 1960 to 2008, a relatively small value considering its 3.1% contribution to the World's sediment discharge. The temporal analysis shows that the Yellow River Basin was once a source in the 1960s, but changed its role to become a weak sink in the past 40?years due to both anthropogenic and climatic influences. The spatial analysis identifies the middle sub-basin as the main source region, and the lower as the main sink. For comparison, sediment-movement-related CO2 fluxes of eight other major basins in four continents are examined. It is found that the six basins considered in the Northern Hemisphere appear to be sinks, while the other two in the Southern Hemisphere act as sources. Copyright (C) 2012 John Wiley & Sons, Ltd.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000309446900005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Geography, Physical; Geosciences, Multidisciplinary; SCI(E); EI; 2; ARTICLE; 13; 1398-1406; 37
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/158362]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Yue, Yao,Ni, Jinren,Borthwick, Alistair G. L.,et al. Diagnosis of river basins as CO2 sources or sinks subject to sediment movement[J]. earth surface processes and landforms,2012.
APA	Yue, Yao,Ni, Jinren,Borthwick, Alistair G. L.,&Miao, Chiyuan.(2012).Diagnosis of river basins as CO2 sources or sinks subject to sediment movement.earth surface processes and landforms.
MLA	Yue, Yao,et al."Diagnosis of river basins as CO2 sources or sinks subject to sediment movement".earth surface processes and landforms (2012).