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title: Steal the light: shade vs fire adapted vegetation in forest-savanna mosaics
author: Charles-Dominique, Tristan;  Midgley, Guy F.;  Tomlinson, Kyle W.;  Bond, William J.
Issued Date: 2018
Abstract: Shade cast by trees, which suppresses grass growth, and fire fuelled by grass biomass, which prevents tree sapling establishment, are mutually exclusive and self-reinforcing drivers of biome distribution in savanna-forest mosaics. We investigated how shade depth, represented by canopy leaf area index (LAI), is generated by adult trees across savanna-forest boundaries and how a shade gradient filters tree functioning, and grass composition and biomass. Forest trees exerted greater shading through increased stem density and greater light interception per unit biomass. A critical transition at LAI c. 1.5 was linked to tree shifts from savanna to forest species, functional shifts from fire-tolerant to light-competitive species, and grass composition shifts from C-4 to C-3 pathways. A second transition to grass fuel loads too low to support fires, occurred at a lower canopy density (LAI > 0.5), accompanied by shifts in C-4 subtype dominance. This pattern suggests that shade suppression of grass biomass is an essential first step for the maintenance of alternative stable states.
Source: NEW PHYTOLOGIST
Related URLs: 10.1111/nph.15117
Appears in Collections:其他_期刊论文

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全文许可: Creative Commons 署名-非商业性使用-相同方式共享 3.0

Recommended Citation:
Charles-Dominique, Tristan,Midgley, Guy F.,Tomlinson, Kyle W.,et al. Steal The Light: Shade Vs Fire Adapted Vegetation In Forest-savanna Mosaics[J]. New Phytologist,2018,218(4):1419-1429.

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