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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/13026

Title: The impact of rain events on CO2 emissions from contrasting land use systems in semi-arid West African savannas
Authors: Berger, Sina
Bliefernicht, Jan
Linstädter, Anja
Canak, Kristijan
Guug, Samuel
Heinzeller, Dominikus
Hingerl, Luitpold
Mauder, Matthias
Neid, Frank
Quansah, Emmanuel
Salack, Seyni
Steinbrecher, Rainer
Kunstmann, Harald
Keywords: Net ecosystem exchange of CO
Cropland
Grazing
Precipitation
Issue Date: Jul-2018
Publisher: Science of the Total Environment
Citation: Science of the Total Environment, 1478–1489
Abstract: 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
Description: This article is published in Science of the Total Environment and also available at . https://doi.org/10.1016/j.scitotenv.2018.07.397
URI: 10.1016/j.scitotenv.2018.07.397
http://hdl.handle.net/123456789/13026
Appears in Collections:College of Science

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