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Justin Dohn, Fadiala Dembélé, Moussa Karembé, Aristides Moustakas, Kosiwa A. Amévor and Niall P. Hanan Tree effects on grass growth in savannas: competition, facilitation and the stress-gradient hypothesis Journal of Ecology 101

Article first published online: 9 NOV 2012 | DOI: 10.1111/1365-2745.12010

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Our results help to resolve questions about the stress-gradient hypothesis (SGH) in semi-arid systems, demonstrating that in mixed tree–grass systems, trees facilitate grass growth in drier regions and suppress grass growth in wetter regions. Relationships differ, however, between African and North American sites representing tropical and temperate bioclimates, respectively. The results of this meta-analysis advance our understanding of tree–grass interactions in savannas and contribute a valuable data set to the developing theory behind the SGH.

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