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Steal the light: shade vs fire adapted vegetation in forest-savanna mosaics
Charles-Dominique, Tristan; Midgley, Guy F.; Tomlinson, Kyle W.; Bond, William J.
2018
Source PublicationNEW PHYTOLOGIST
ISSN0028-646X
Volume218Issue:4Pages:1419-1429
AbstractShade 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.
Department其他
KeywordBranch Mass Per Area Ecological Threshold Fire Ecology Functional Traits Grassland-forest Mosaics Photosynthetic Pathway Savanna Shade Tolerance
Subject AreaPlant Sciences
Language英语
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/10985
Collection其他
Recommended Citation
GB/T 7714
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.
APA Charles-Dominique, Tristan,Midgley, Guy F.,Tomlinson, Kyle W.,&Bond, William J..(2018).Steal the light: shade vs fire adapted vegetation in forest-savanna mosaics.NEW PHYTOLOGIST,218(4),1419-1429.
MLA Charles-Dominique, Tristan,et al."Steal the light: shade vs fire adapted vegetation in forest-savanna mosaics".NEW PHYTOLOGIST 218.4(2018):1419-1429.
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