Forestry; allometric models; tree aboveground biomass; Congo basin; tropical forests
Abstract :
[en] Abstract
Many allometric models to predict tree aboveground biomass have been developed in tropical moist forests, but few models are available for tree belowground biomass. Theory predicts that belowground biomass scales in an isometric way with aboveground biomass. Estimates of belowground biomass could then be derived from aboveground biomass using the root:shoot ratio. Using a dataset of 118 tropical trees for which both aboveground and belowground biomass and other tree and species characteristics were measured in Gabon and Cameroon, we found a near isometric, yet significantly allometric, relationship between belowground biomass (B, in kilograms) and aboveground biomass (A, in kilograms): B = 0.324 A0.939. The root:shoot ratio was 0.20–0.22, regardless of tree size. An efficient model to predict belowground biomass from tree diameter (D, in centimeters), height (H, in meters) and wood density (ρ, in grams per cubic centimeter) was B = 0.0188 (ρD2H)0.977. A significant residual effect of species and leaf habit was found in this model, indicating that further tree and species characteristics are likely to explain additional variation in belowground biomass. Yet, the future development of belowground allometric models can benefit from the many models already developed for aboveground biomass. On the basis of this unprecedented sampling effort on tree belowground biomass in the dense tropical forests of the Congo Basin, we conclude that the scaling of belowground biomass with aboveground biomass should be the relationship to focus on.
Kossi Ditsouga, Alain Franck; Institut de Recherche en Ecologie Tropicale (IRET), Centre National de la Recherche Scientifique et Technologique (CENAREST) , Libreville , Gabon ; Université des Sciences et Techniques de Masuku , Franceville , Gabon
Moundounga Mavouroulou, Quentin; Institut de Recherche en Ecologie Tropicale (IRET), Centre National de la Recherche Scientifique et Technologique (CENAREST) , Libreville , Gabon
Moundounga, Cynel Gwenael; Institut de Recherche en Ecologie Tropicale (IRET), Centre National de la Recherche Scientifique et Technologique (CENAREST) , Libreville , Gabon
Fayolle, Adeline ; Université de Liège - ULiège > TERRA Research Centre > Gestion des ressources forestières ; Cirad Forêts et Sociétés, Campus International de Baillarguet , Montpellier 34398 , France
Picard, Nicolas; GIP ECOFOR , Paris 75116 , France
Sato, Akinobu; Japan Forest Technology Association (JAFTA), Forest Information Group , Tokyo 102-0085 , Japan
Ngomanda, Alfred; Institut de Recherche en Ecologie Tropicale (IRET), Centre National de la Recherche Scientifique et Technologique (CENAREST) , Libreville , Gabon
Language :
English
Title :
Tree belowground biomass in Congo Basin forests: allometric equations and scaling with aboveground biomass
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