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Survival, growth and reproduction by big-leaf mahogany (Swietenia macrophylla) in open clearing vs. forested conditions in BrazilAuthor(s): James Grogan; Mark Schulze; Jurandir Galvao
Source: New Forests. 40:335-347.
Publication Series: Scientific Journal (JRNL)
Station: International Institute of Tropical Forestry
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Related Research Highlights Sustainable Management of Big-leaf Mahogany in the Brazilian Amazon
DescriptionBig-leaf mahogany (Swietenia macrophylla) trees are often retained in agricultural fields and pastures for seed and timber production after selective logging and forest clearing in the Brazilian Amazon. At a forest management site in southeast Para´, we censused trees growing scattered across a large open clearing after forest removal and in heavily disturbed forest after selective logging and canopy thinning for survival, stem diameter growth, fruit production, and date of dry season flowering initiation annually during 1997–2003. Trees in the open clearing died at faster rates, grew more slowly, produced fewer fruit, and initiated flowering earlier, on average, than trees in logged and thinned forest during this period. The principal cause of mortality and stem damage in both environments was dry season groundfires. Mahogany trees in logged and thinned forest at the study site grew faster than mahogany trees at a selectively logged but otherwise undisturbed closed-canopy forest site in this region during the same period. This was likely due to vine elimination by groundfires, increased crown exposure after canopy thinning, and soil nutrient inputs due to groundfires. Without effective regulation and control of anthropogenic fires, attempts to manage remnant mahogany trees for future timber yields or to restore commercially viable populations in this region may prove futile.
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CitationGrogan, James; Schulze, Mark; Galvao, Jurandir. 2010. Survival, growth and reproduction by big-leaf mahogany (Swietenia macrophylla) in open clearing vs. forested conditions in Brazil. New Forests. 40:335-347.
KeywordsAgricultural-landscape trees, Crown liberation, Fire-induced mortality, Fruit production, Isolated trees, Shelterwood
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