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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/771

Title: Tree-grass interactions in savannas
Authors: Scholes, RJ
Archer, SR
Keywords: Competition
Facilitation
Herbivory
Stability
Fire
Issue Date: 1997
Publisher: Annual Reviews Inc
Citation: Scholes. RJ and Archer, SR. Tree-grass interactions in savannas. Annual Review Of Ecology And Systematics, Vol. 8, pp 517-544
Abstract: Savannas occur where trees and grasses interact to create a biome that is neither grassland nor forest. Woody and gramineous plants interact by many mechanisms, some negative (competition) and some positive (facilitation). The strength and sign of the interaction Varies in both time and space, allowing a rich array of possible outcomes but no universal predictive model. Simple models of coexistence of trees and grasses, based on separation in rooting depth, are theoretically and experimentally inadequate. Explanation of the widely observed increase in tree biomass following introduction of commercial ranching into savannas requires inclusion of interactions among browsers, grazers, and fires, and their effects on tree recruitment. Prediction of the consequences of manipulating tree biomass through clearing further requires an understanding of how trees modify light, water, and nutrient environments of grasses. Understanding the nature of coexistence between trees and grass, which under other circumstances are mutually exclusive or unequal partners, yields theoretical insights and has practical implications.
Description: Copyright: 1997 Annual Reviews Inc
URI: http://hdl.handle.net/10204/771
ISSN: 0066-4162
Appears in Collections:Forestry and wood science
Ecosystems processes & dynamics
General science, engineering & technology

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