Assessing inter- and intra-specific variation in trunk carbon concentration for 32 neotropical tree species

نویسندگان

  • Marlène Elias
  • Catherine Potvin
چکیده

Trunk carbon (C) concentrations were assessed for 32 species of tropical trees to understand sources of variation. The main effect of species accounted for 38% of the total variance in C concentration (p < 0.0001). Tectona grandis demonstrated the greatest C concentration (49.4%), while Ormosia macrocalyx displayed the lowest C concentration (44.4%). We also observed significant differences among the sampling sites (F = 2.2, p < 0.02). For three of the species sampled in both plantations and natural forests, the natural forest individuals had significantly higher C concentrations (Dipteryx panamensis: F = 6.10, p = 0.06; Hura crepitans: F = 5.53, p = 0.06; and Miconia argentea: F = 8.92, p = 0.02). C concentration was highly correlated with wood specific gravity (r2 = 0.86). A canonical correspondence analysis was performed to identify the environmental and (or) growth factors explaining variation in trunk C concentration. The two factors with the highest loading values on the first canonical axis are site and diameter at breast height (DBH), while DBH and density load on axis 2. The biplot shows that species respond differently to environmental factors. Our results suggest that a better consideration of interspecific variation in C concentration could reduce the error associated with estimates of C sequestration by up to 10%. Résumé : La concentration de carbone (C) dans le tronc de 32 espèces d’arbres tropicaux a été déterminée pour connaître les sources de variation. L’effet principal dû à l’espèce comptait pour 38 % de la variation totale de la concentration de C (p < 0,0001). Tectona grandis avait la plus forte concentration de C (49,4 %) tandis que Ormosia macrocalyx avait la plus faible (44,4 %). Nous avons également observé des différences significatives entre les sites d’échantillonnage (F = 2,2, p < 0,02). Pour trois des espèces échantillonnées tant en plantation qu’en forêt naturelle, les individus échantillonnés en forêt naturelle avaient une concentration de C significativement plus élevée (Dipteryx panamensis: F = 6,10, p < 0,06; Hura crepitans: F = 5,53, p < 0,06; Miconia argentea: F = 8,92, p < 0,02). La concentration de C est étroitement corrélée avec la masse spécifique du bois (r2 = 0,86). Une analyse canonique des correspondances a été effectuée pour identifier les facteurs environnementaux et de croissance qui expliquent la variation dans la concentration de C dans le tronc. Les deux facteurs ayant la plus forte valeur sur le premier axe canonique sont le site et le diamètre à hauteur de poitrine (DBH) tandis que le DBH et la masse spécifique ressortent sur le deuxième axe. Le diagramme de double projection montre que les espèces réagissent différemment aux facteurs environnementaux. Nos résultats indiquent que l’erreur associée aux estimations de séquestration du C pourrait être réduite jusqu’à 10 % en prenant en considération la variation interspécifique dans la concentration de C. [Traduit par la Rédaction] Elias and Potvin 1045

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تاریخ انتشار 2003