Wood density variations of legume trees in French Guiana along the shade tolerance continuum: Heartwood effects on radial patterns and gradients

Lehnebach Romain, Bossu Julie, Va Stéphanie, Morel Hélène, Amusant Nadine, Nicolini Eric-André, Beauchêne Jacques. 2019. Wood density variations of legume trees in French Guiana along the shade tolerance continuum: Heartwood effects on radial patterns and gradients. Forests, 10 (2), n.spéc. Wood Science and Tropical Forest Ecology:80, 22 p.

Quartile : Q1, Sujet : FORESTRY

Résumé : Increasing or decreasing wood density (WD) from pith to bark is commonly observed in tropical tree species. The different types of WD radial variations, long been considered to depict the diversity of growth and mechanical strategies among forest guilds (heliophilic vs. shade-tolerant), were never analyzed in the light of heartwood (HW) formation. Yet, the additional mass of chemical extractives associated to HW formation increases WD and might affect both WD radial gradient (i.e., the slope of the relation between WD and radial distance) and pattern (i.e., linear or nonlinear variation). We studied 16 legumes species from French Guiana representing a wide diversity of growth strategies and positions on the shade-tolerance continuum. Using WD measurements and available HW extractives content values, we computed WD corrected by the extractive content and analyzed the effect of HW on WD radial gradients and patterns. We also related WD variations to demographic variables, such as sapling growth and mortality rates. Regardless of the position along the shade-tolerance continuum, correcting WD gradients reveals only increasing gradients. We determined three types of corrected WD patterns: (1) the upward curvilinear pattern is a specific feature of heliophilic species, whereas (2) the linear and (3) the downward curvilinear patterns are observed in both mid- and late-successional species. In addition, we found that saplings growth and mortality rates are better correlated with the corrected WD at stem center than with the uncorrected value: taking into account the effect of HW extractives on WD radial variations provides unbiased interpretation of biomass accumulation and tree mechanical strategies. Rather than a specific feature of heliophilic species, the increasing WD gradient is a shared strategy regardless of the shade tolerance habit. Finally, our study stresses to consider the occurrence of HW when using WD.

Mots-clés Agrovoc : Fabaceae, arbre, forêt tropicale, ombrage, accroissement du diamètre, bois de coeur, bois de réaction, densité du bois

Mots-clés géographiques Agrovoc : Guyane française, France

Mots-clés complémentaires : Leguminosae [arbres]

Mots-clés libres : French Guiana, Shade tolerance, Wood density variations, Growth–mortality rate, Heartwood extractives, Heartwood, Legumes, Sapwood

Classification Agris : K10 - Production forestière
F62 - Physiologie végétale - Croissance et développement
F50 - Anatomie et morphologie des plantes

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

Auteurs et affiliations

• Lehnebach Romain, Université de Montpellier (FRA) ORCID: 0000-0001-6175-4437 - auteur correspondant
• Bossu Julie, Université de Guyane (GUF)
• Va Stéphanie, Université de Montpellier (FRA)
• Morel Hélène, Université des Antilles (GLP)
• Amusant Nadine, CIRAD-ES-UMR Ecofog (GUF)
• Nicolini Eric-André, CIRAD-BIOS-UMR AMAP (FRA)
• Beauchêne Jacques, CIRAD-ES-UMR Ecofog (GUF) ORCID: 0000-0003-4578-3670

Source : Cirad-Agritrop (https://agritrop.cirad.fr/598726/)

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