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|Title: ||The impact of rain events on CO2 emissions from contrasting land use systems in semi-arid West African savannas|
|Authors: ||Berger, Sina|
|Keywords: ||Net ecosystem exchange of CO|
|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 .
|Appears in Collections:||College of Science|
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