Canopy surface topography in a French Guiana forest and the folded forest theory
The canopy surface is an undulating surface that follows the irregular contours of the upper tree crowns and defines the inner and the outer limits of the forest volume. In French Guiana, the height of the canopy surface was surveyed in both a primary and a 20-years old clear-felled secondary forest plot. The topographic surface was displayed in a three-dimensional mesh, where X and Y are horizontal co-ordinates, and Z is the canopy height measured from the ground with an optical telemeter. The statistical dispersion of Z-data, and the spatial tree height variations, are interpreted at different levels of ecosystem organisation, from forest type (primary or secondary forest) to the trees themselves, following the folded forest model theory (Oldeman 1992, 1994). The vertical growth of trees creates a convex pattem in the relief of canopy surface, whereas gaps make 'concavities' which delimit impact of perturbation on the forest structure. These events are either the result of the dynamic of single trees (emergent and decayed trees), or arise from the dynamic of a group of trees working together (group of emergent trees or complex gaps). At the plot scale, the elementary events, convexities and concavities, are gathered on similar topo-sequences, and form canopy units either higher or lower than the average canopy height. This study suggests that the topography of the canopy surface is defined by a complex nested system from trees, to groups of trees, to canopy units, within a delimited floristic and physical environment.
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Subjects: | F40 - Écologie végétale, K01 - Foresterie - Considérations générales, forêt tropicale, http://aims.fao.org/aos/agrovoc/c_24904, http://aims.fao.org/aos/agrovoc/c_3423, |
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dig-cirad-fr-5479322022-04-22T13:09:02Z http://agritrop.cirad.fr/547932/ http://agritrop.cirad.fr/547932/ Canopy surface topography in a French Guiana forest and the folded forest theory. Birnbaum Philippe. 2001. Plant Ecology, 153 (1) : 293-300.https://doi.org/10.1023/A:1017563809252 <https://doi.org/10.1023/A:1017563809252> Researchers Canopy surface topography in a French Guiana forest and the folded forest theory Birnbaum, Philippe eng 2001 Plant Ecology F40 - Écologie végétale K01 - Foresterie - Considérations générales forêt tropicale http://aims.fao.org/aos/agrovoc/c_24904 Guinée http://aims.fao.org/aos/agrovoc/c_3423 The canopy surface is an undulating surface that follows the irregular contours of the upper tree crowns and defines the inner and the outer limits of the forest volume. In French Guiana, the height of the canopy surface was surveyed in both a primary and a 20-years old clear-felled secondary forest plot. The topographic surface was displayed in a three-dimensional mesh, where X and Y are horizontal co-ordinates, and Z is the canopy height measured from the ground with an optical telemeter. The statistical dispersion of Z-data, and the spatial tree height variations, are interpreted at different levels of ecosystem organisation, from forest type (primary or secondary forest) to the trees themselves, following the folded forest model theory (Oldeman 1992, 1994). The vertical growth of trees creates a convex pattem in the relief of canopy surface, whereas gaps make 'concavities' which delimit impact of perturbation on the forest structure. These events are either the result of the dynamic of single trees (emergent and decayed trees), or arise from the dynamic of a group of trees working together (group of emergent trees or complex gaps). At the plot scale, the elementary events, convexities and concavities, are gathered on similar topo-sequences, and form canopy units either higher or lower than the average canopy height. This study suggests that the topography of the canopy surface is defined by a complex nested system from trees, to groups of trees, to canopy units, within a delimited floristic and physical environment. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/547932/1/document_547932.pdf application/pdf Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1023/A:1017563809252 10.1023/A:1017563809252 http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=203115 info:eu-repo/semantics/altIdentifier/doi/10.1023/A:1017563809252 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1023/A:1017563809252 |
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F40 - Écologie végétale K01 - Foresterie - Considérations générales forêt tropicale http://aims.fao.org/aos/agrovoc/c_24904 http://aims.fao.org/aos/agrovoc/c_3423 F40 - Écologie végétale K01 - Foresterie - Considérations générales forêt tropicale http://aims.fao.org/aos/agrovoc/c_24904 http://aims.fao.org/aos/agrovoc/c_3423 |
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F40 - Écologie végétale K01 - Foresterie - Considérations générales forêt tropicale http://aims.fao.org/aos/agrovoc/c_24904 http://aims.fao.org/aos/agrovoc/c_3423 F40 - Écologie végétale K01 - Foresterie - Considérations générales forêt tropicale http://aims.fao.org/aos/agrovoc/c_24904 http://aims.fao.org/aos/agrovoc/c_3423 Birnbaum, Philippe Canopy surface topography in a French Guiana forest and the folded forest theory |
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The canopy surface is an undulating surface that follows the irregular contours of the upper tree crowns and defines the inner and the outer limits of the forest volume. In French Guiana, the height of the canopy surface was surveyed in both a primary and a 20-years old clear-felled secondary forest plot. The topographic surface was displayed in a three-dimensional mesh, where X and Y are horizontal co-ordinates, and Z is the canopy height measured from the ground with an optical telemeter. The statistical dispersion of Z-data, and the spatial tree height variations, are interpreted at different levels of ecosystem organisation, from forest type (primary or secondary forest) to the trees themselves, following the folded forest model theory (Oldeman 1992, 1994). The vertical growth of trees creates a convex pattem in the relief of canopy surface, whereas gaps make 'concavities' which delimit impact of perturbation on the forest structure. These events are either the result of the dynamic of single trees (emergent and decayed trees), or arise from the dynamic of a group of trees working together (group of emergent trees or complex gaps). At the plot scale, the elementary events, convexities and concavities, are gathered on similar topo-sequences, and form canopy units either higher or lower than the average canopy height. This study suggests that the topography of the canopy surface is defined by a complex nested system from trees, to groups of trees, to canopy units, within a delimited floristic and physical environment. |
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article |
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F40 - Écologie végétale K01 - Foresterie - Considérations générales forêt tropicale http://aims.fao.org/aos/agrovoc/c_24904 http://aims.fao.org/aos/agrovoc/c_3423 |
author |
Birnbaum, Philippe |
author_facet |
Birnbaum, Philippe |
author_sort |
Birnbaum, Philippe |
title |
Canopy surface topography in a French Guiana forest and the folded forest theory |
title_short |
Canopy surface topography in a French Guiana forest and the folded forest theory |
title_full |
Canopy surface topography in a French Guiana forest and the folded forest theory |
title_fullStr |
Canopy surface topography in a French Guiana forest and the folded forest theory |
title_full_unstemmed |
Canopy surface topography in a French Guiana forest and the folded forest theory |
title_sort |
canopy surface topography in a french guiana forest and the folded forest theory |
url |
http://agritrop.cirad.fr/547932/ http://agritrop.cirad.fr/547932/1/document_547932.pdf |
work_keys_str_mv |
AT birnbaumphilippe canopysurfacetopographyinafrenchguianaforestandthefoldedforesttheory |
_version_ |
1758021901717864448 |