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DOI	10.1016/j.scitotenv.2018.07.397
	The impact of rain events on CO2 emissions from contrasting land use systems in semi-arid West African savannas
	Berger, Sina 1,2; Bliefernicht, Jan 2; Linstaedter, Anja 3,4; Canak, Kristijan 3,5; Guug, Samuel 6; Heinzeller, Dominikus 1,2,7; Hingerl, Luitpold 2; Mauder, Matthias 1; Neidl, Frank 1; Quansah, Emmanuel 8; Salack, Seyni 6; Steinbrecher, Rainer 1; Kunstmann, Harald 1,2
通讯作者	Berger, Sina
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2019
卷号	647 页码:1478-1489
英文摘要	In the future the Sudanian savanna - one of West Africa's high-potential bread baskets - will likely face shorter rainy seasons with more extreme rains and droughts. That could have serious impacts on the vegetation and its carbon dioxide (CO2) exchange with potentially increasing CO2 emissions accelerating climate warming. Understanding how the CO2 fluxes in this area respond to environmental variables, in particular rain events, is essential, but available data are scarce. In this study, we monitored net ecosystem exchange (NEE) of CO2, rainfall and other environmental parameters during four years at three savannas. Savannas were characterized by different vegetation due to different land use: i) woody and nearly pristine, ii) mixture of cropland and grassland and iii) intensive grazing. The impact of rain events on CO2 exchange for these contrasting ecosystems were analyzed for single rain events (short-term) and on a yearly time scale (long-term) using three eddy covariance towers. We found that the woody pristine savanna site was a prominent sink of CO2 (-864 to -1299 g CO2 m(-2) y(-1)) while the degraded sites were net CO2 sources (118 to 605 g CO2 m(-2) y(-1)) with a complicated relation with annual rainfall amounts. The NEE responses to single rain events revealed that daytime rain systematically decreased the sink strengths at all sites, which might be associated with decreased light availability. At the degraded sites, additional factors increasing CO2 losses were rain duration and dry spell length. The observed patterns of immediate CO2 flux responses to rainfall at differently used savannas indicate strong internal feed-backs between vegetation and land use changes and raise the question whether the CO2 sink strengths might be overestimated with possible implications for global CO2 budgets. Sustainable adaptation strategies need to be developed for West Africa. (C) 2018 Elsevier B.V. All rights reserved.
英文关键词	Net ecosystem exchange of CO2 Cropland Grazing Precipitation
类型	Article
语种	英语
国家	Germany ; Burkina Faso ; USA ; Ghana
收录类别	SCI-E
WOS记录号	WOS:000447090400148
WOS关键词	NAZINGA GAME RANCH ; BURKINA-FASO ; ECOSYSTEM RESPIRATION ; CLIMATE VARIABILITY ; SOIL-MOISTURE ; GAS-EXCHANGE ; CARBON ; PRODUCTIVITY ; FLUXES ; GRASSLAND
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218581
作者单位	1.Karlsruhe Inst Technol, Inst Meteorol & Climate Res, Campus Alpin, Garmisch Partenkirchen, Germany; 2.Univ Augsburg, Inst Geog, Augsburg, Germany; 3.Univ Cologne, Bot Inst, Range Ecol & Range Management Grp, Cologne, Germany; 4.Univ Bonn, Inst Crop Sci & Resource Conservat, Bonn, Germany; 5.Univ Bonn, Dept Geog, Bonn, Germany; 6.WASCAL Competence Ctr, West African Sci Serv Ctr Climate Change & Adapte, Ouagadougou, Burkina Faso; 7.Univ Colorado, Cooperat Inst Res Environm Sci, NOAA, OAR,ESRL,Global Syst Div, Boulder, CO 80309 USA; 8.Kwame Nkrumah Univ Sci & Technol, Dept Phys, Kumasi, Ghana
推荐引用方式 GB/T 7714	Berger, Sina,Bliefernicht, Jan,Linstaedter, Anja,et al. The impact of rain events on CO2 emissions from contrasting land use systems in semi-arid West African savannas[J],2019,647:1478-1489.
APA	Berger, Sina.,Bliefernicht, Jan.,Linstaedter, Anja.,Canak, Kristijan.,Guug, Samuel.,...&Kunstmann, Harald.(2019).The impact of rain events on CO2 emissions from contrasting land use systems in semi-arid West African savannas.SCIENCE OF THE TOTAL ENVIRONMENT,647,1478-1489.
MLA	Berger, Sina,et al."The impact of rain events on CO2 emissions from contrasting land use systems in semi-arid West African savannas".SCIENCE OF THE TOTAL ENVIRONMENT 647(2019):1478-1489.