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publié dans Ressources le 28 octobre 2016

Green and blue water demand from large-scale land acquisitions in Africa

PNAS

Accaparement des terresIrrigation, eauAfriqueEtude, rapport

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In the last decade, more than 22 million ha of land have been contracted to large-scale land acquisitions in Africa, leading to increased pressures, competition, and conflicts over freshwater resources. This study shows that most land acquisitions are planted with crops that demand large volumes of water (>9,000 m3⋅ha−1) like sugarcane, jatropha, and eucalyptus, and that staple crops have lower water requirements (<7,000 m3⋅ha−1). Even if the most efficient irrigation systems were implemented, 18% of the land acquisitions, totaling 91,000 ha, would still require more than 50% of water from blue water sources. These hotspots indicate areas at risk for transgressing regional constraints for freshwater use as a result of overconsumption of blue water, where socioenvironmental systems might face increased conflicts and tensions over water resources.

  • http://www.pnas.org/content/113/41/11471.full.pdf?with-ds=yes
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