Growth behaviour of trees and relationship with some descriptors of the environment

Gourlet-Fleury Sylvie, Picard Nicolas. 2004. Growth behaviour of trees and relationship with some descriptors of the environment. In : Ecology and management of a neotropical rainforest : lessons drawn from Paracou, a long-term experimental research site in French Guiana. Gourlet-Fleury Sylvie (ed.), Guehl Jean-Marc (ed.), Laroussinie Olivier (ed.). ECOFOR. Paris : Elsevier, 229-253. ISBN 2-84299-455-8

Résumé : In tropical rainforests, trees over 10 cm diameter at breast height (DBH) show a great variability in diameter increments. We first characterise the phenomenon on the Paracou plots and examine its evolution over time and according to silvicultural treatments. Among the many factors which can explain the variability of growth, some can be more or less easily examined with the data available on the site: annual rainfall, botanical identity, size of the trees, topography and soils characteristics, competition for light, water and nutrients. The last effect can be estimated through the use of competition indices, either one- sided or two-sided (showing the competition for light or for all types of resources, respectively). We have tried to gradually incorporate the most influential factors in a model describing individual growth, and have shown that the residuals include tendencies suggesting that explanatory factors still have to be taken into account. In addition to other results, this work led us to build groups of species which can be qualified as homogeneous as far as diameter increment is concerned. The methods to further improve the explanations of growth variability are discussed.

Mots-clés Agrovoc : forêt tropicale humide, croissance, composition botanique, compétition biologique, propriété physicochimique du sol, topographie

Mots-clés géographiques Agrovoc : Guyane française, France

Classification Agris : F62 - Physiologie végétale - Croissance et développement

Champ stratégique Cirad : Axe 6 (2005-2013) - Agriculture, environnement, nature et sociétés

Auteurs et affiliations

• Gourlet-Fleury Sylvie, CIRAD-FORET-FORETS NATURELLES (FRA) ORCID: 0000-0002-1136-4307
• Picard Nicolas, CIRAD-FORET-FORETS NATURELLES (MLI)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/522439/)

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