|Title||Tree effects on grass growth in savannas: competition, facilitation and the stress-gradient hypothesis|
|Publication Type||Journal Article|
|Year of Publication||2013|
|Authors||Dohn J, Dembélé F, Karembé M, Moustakas A, Amévor KA, Hanan N|
|Journal||Journal of Ecology|
|Keywords||Africa, competition, facilitation, hypothesis, North America, plant–plant interactions, rainfall gradient, savanna, stress-gradient hypothesis, tree–grass interactions|
1. The stress-gradient hypothesis (SGH) predicts an increasing importance of facilitative mechanisms relative to competition along gradients of increasing environmental stress. Although developed across a variety of ecosystems, the SGH’s relevance to the dynamic tree–grass systems of global savannas remains unclear. Here, we present a meta-analysis of empirical studies to explore emergent patterns of tree–grass relationships in global savannas in the context of the SGH.