Manioc : Portail | resultats 1 - 20 pour la recherche: TRUNK VOLUME

Narrative of a five years' expedition against the revolted negroes of Surinam in Guiana, on the wild coast of South America from the year 1772 to 1777, elucidating the history of that country and describing its productions... with an account of the Indians of Guiana and negroes of Guinea... Tome 2
Auteur(s) : Stedman, John Gabriel (1744-1797)
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Notes on Haïti, made during a residence in that republic : in two volumes. Volume 1
Auteur(s) : Mackenzie, Charles (1788-1862)
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Complete story of the Martinique and St. Vincent horrors
Auteur(s) : Garesche, William A. (1852-1905)
Auteurs secondaires : Demessimy, Vincent (18..-1)
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Les nouvelles conquêtes de la science : les voies ferrées dans les deux mondes
Auteur(s) : Figuier, Louis (1819-1894)
Auteurs secondaires : Ferat, Jules (1819-1) Gilbert, A. Broux, P. (18..-18..)
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Mélanges de littérature. [Volume 4]; Tome premier
Auteur(s) : Suard, Jean-Baptiste-Antoine (1732-1817)
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A voyage to the Demerary : containing a statistical account of the settlements there, and of those on the Essequebo, the Berbice, and others contiguous rivers of Guyana
Auteur(s) : Bolingbroke, Henry (1785-1855)
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Personal narrative of travels to the equinoctial regions of America, during the years 1799-1804 / by Alexander von Humboldt and Aimé Bonpland ; translated from the French of Alexander von Humboldt and edited by Thomasina Ross. Volume 2
Auteur(s) : Bonpland, Aimé (1773-1858) Humboldt, Alexander von (1769-1859)
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The knockabout club in the Antilles and thereabouts
Auteur(s) : Ober, Frederick Albion (1849-1913)
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Heartwood/sapwood profile and the tradeoff between trunk and crown increment in a natural forest: the case study of a tropical tree (Dicorynia guianensis Amsh., Fabaceae)
Auteur(s) : Lehnebach, Romain Morel, Hélène Bossu, Julie Le Moguedec, Gilles Amusant, Nadine Beauchêne, Jacques Nicolini, Eric
Auteurs secondaires : Botanique et Modélisation de l'Architecture des Plantes et des Végétations (UMR AMAP) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD) - Institut national de la recherche agronomique [Montpellier] (INRA Montpellier) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Institut de Recherche pour le Développement (IRD [France-Sud]) Ecologie des forêts de Guyane (ECOFOG) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD) - Institut National de la Recherche Agronomique (INRA) - Université des Antilles et de la Guyane (UAG) - AgroParisTech - Université de Guyane (UG) - Centre National de la Recherche Scientifique (CNRS) Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD) Laboratoire GéoSciences Réunion (LGSR) ; Université de la Réunion (UR) - Institut de Physique du Globe de Paris

Éditeur(s) : HAL CCSD Springer Verlag
Résumé : International audience
Heartwood/sapwood profile and the tradeoff between trunk and crown increment in a natural forest: the case study of a tropical tree (Dicorynia guianensis Amsh., Fabaceae) Key message Sapwood area and the radial growth rate of the trunk follow the same pattern at breast height, with an initial increase and subsequent constant value, resulting from the increasing growth allocation toward the crown rather than tree decline. Heartwood area and heartwood volume in the trunk increase more rapidly after this shift occurs. Abstract Sapwood (SW) and heartwood (HW) are two functionally distinct classifications of wood in perennial stems for which quantities can vary greatly in tropical trees. Numerous positive correlations have been found between the radial growth rate (RGR) and SW quantity; however, variations in the SW/HW quantities have not been studied in light of the ontogenetic variation of RGR. Wood core sampling, intensive measurements of tree structure (number of branches, stem volumes), and radial growth monitoring were performed on an abundant and highly exploited tree species in French Guiana (Dicorynia guianensis) to investigate the relationship between RGR, SW/HW quantity, tree structure, and their variations on the course of a tree's ontogeny. SW area and RGR followed the same pattern of variation throughout tree development, both increasing first and reaching a steady state after 50 cm DBH (diameter at breast height). After this value, we observed a strong increase in both the HW area and HW volume increment, concomitant with a more rapid increase in crown volume. The stabilization of RGR for trees with DBH >50 cm was related not to a tree's decline but rather to an increasing wood allocation to the crown, confirming that RGR at breast height is a poor indicator of whole-tree growth for bigger individuals. We also confirmed that HW formation is an ontogenetic process managing SW quantity that is continuously and increasingly produced within the crown as the tree grows. This study highlights the effect of growth-mediated ontogenetic changes on the localization of water and carbohydrate storage within a tree, resulting from SW and HW dynamics throughout tree ontogeny.
ISSN: 0931-1890

hal-01654003
https://hal.archives-ouvertes.fr/hal-01654003
https://hal.archives-ouvertes.fr/hal-01654003/document
https://hal.archives-ouvertes.fr/hal-01654003/file/Lehnebach%20et%20al.%E2%80%94Trees%202016-%20Own%20version.pdf
DOI : 10.1007/s00468-016-1473-7

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Antigua and the Antiguans: a full account of the colony and its inhabitants from the time of the Caribs to the present day, interspersed with anecdotes and legends : also, an impartial view of slavery and the free labour systems, the statistics of the island, and biographical notices of the principal families, Volume 2
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Personal narrative of travels to the equinoctial regions of America, during the years 1799-1804 / by Alexander von Humboldt and Aimé Bonpland ; translated from the French of Alexander von Humboldt and edited by Thomasina Ross. Volume 1
Auteur(s) : Bonpland, Aimé (1773-1858) Humboldt, Alexander von (1769-1859)
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Camps in the Caribbees : the adventures of a naturalist in the Lesser Antilles
Auteur(s) : Ober, Frederick Albion (1849-1913)
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The colony of British Guyana and its labouring population
Auteur(s) : Bronkhurst, Rév. H.V.P.
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Anti-slavery Leaders of North Carolina
Auteur(s) : Bassett, John Spencer (1867-1928)
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The West Indies
Auteur(s) : Eves, Charles Washington Augero (1838-1899)
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A treatise of the diseases most frequent in the West-Indies, and herein more particularly of those which occur in Barbadoes
Auteur(s) : Towne, Richard (1690-17..)
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Xtrawood: refining estimation of tree above ground biomass using wood density variations and tree structure
Auteur(s) : Lehnebach, Romain Morel, Hélène Bossu, Julie Beauchêne, Jacques Nicolini, Eric Barczi, Jean-François Griffon, Sébastien
Auteurs secondaires : Botanique et Modélisation de l'Architecture des Plantes et des Végétations (UMR AMAP) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD) - Institut national de la recherche agronomique [Montpellier] (INRA Montpellier) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Institut de Recherche pour le Développement (IRD [France-Sud]) Ecologie des forêts de Guyane (ECOFOG) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD) - Institut National de la Recherche Agronomique (INRA) - Université des Antilles et de la Guyane (UAG) - AgroParisTech - Université de Guyane (UG) - Centre National de la Recherche Scientifique (CNRS) Centre National de la Recherche Scientifique (CNRS)

Éditeur(s) : HAL CCSD
Résumé : International audience
BackgroundTree above ground biomass (AGB) is currently estimated by tree-level allometrical models that take into account, tree volume estimated from proxy variables of tree size (DBH) and species average wood specific gravity (WSG). These methods are common and realistic from a practical point of view. However, they do not take into account deviance from fixed allometrical trajectories and species or tree level WSG variations. Here, we present Xtrawood software that allows computation of tree AGB according to structure and WSG variations.MethodXtrawood reconstructs tree structure and integrates WSG variations by merging tree structure and WSG data measured at different position in trees, leading to the computation of global AGB and visualization of WSG variation along tree structure. Tree structure is measured according to stem dimensions (length, diameter) and positions within tree, and encoded in Multiscale Tree Graph format (MTG). WSG data is made of radial WSG profiles (1 measure each 0,5 cm from pith to bark) sampled at different heights within whole tree. Xtrawood output are illustrated using a dataset collected on an Amazonian forest ‘biomass dominant species’, Dicorynia guianensis Amsh., also known to exhibit substantial WSG gradients along both radial and vertical axis. 9 trees ranging from 15 to 60 cm DBH were measured by climbers. Each tree was felled and samples were collected at different positions (3 in trunk, 1 to 5 in crown) to record WSG radial profiles.ResultsXtrawood allows computation of tree volume, but also visualization of WSG variations in tree as well as inference of WSG radial profiles at different heights. Output variables are decomposed according to different tree scale and locations (axis, trunk/crown) and easy to extract. Xtrawood results will be compared to those of standard estimation method and can be used to identify positions in trees where WSG value leads to the better estimate of tree AGB.Conclusion/perspectiveXtrawood produces AGB estimate with data from intensive measurements practices. The sampling protocol, used here, remains destructive and time-consuming because Xtrawood is not directly dedicated to forest managers, but to help calibration of realistic sampling strategies. Moreover, Xtrawood offers a way to understand relationships between tree development, WSG variations within tree structure and biomass accumulation in the context of natural forests or plantations. A software demo is available at coffee break.
53rd Annual Meeting of the Association for Tropical Biology and Conservation (ATBC 2016)
Montpellier, France

Droits : http://creativecommons.org/licenses/by/
hal-01349613
https://hal.archives-ouvertes.fr/hal-01349613

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The civil and natural History of Jamaica. In three parts. Containing, I. An accurate description of that island, its situation and soil ; with a brief account of its former and present State, Government, Revenues, Produce, and Trade. II. A history of the natural productions, including the various sorts of native fossils ; perfect and impercfect begetables ; quadrupedes, birds, fishes, reptiles and insects ; with their properties and uses in mechanics, diet, and physic. III. An account of the nature of climates in general, and their different effects upon the human body ; with a detail of the diseases arising from this source, particularly within the Tropics. In three dissertations. The whole illustrated with fifty copper-plates : in which the most curious productions are represented of the natural size, and delineated immediately from the objects
Auteur(s) : Browne, Patrick (1720-1790)
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Antigua and the Antiguans: a full account of the colony and its inhabitants from the time of the Caribs to the present day, interspersed with anecdotes and legends : also, an impartial view of slavery and the free labour systems, the statistics of the island, and biographical notices of the principal families, Volume 1
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Journal of the New-York botanical garden. Vol. 4, n°47
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