|Reference : Environmental ﬁltering of dense-wooded species controls above-ground biomass stored in A...|
|Scientific journals : Article|
|Life sciences : Phytobiology (plant sciences, forestry, mycology...)|
Life sciences : Environmental sciences & ecology
|Environmental ﬁltering of dense-wooded species controls above-ground biomass stored in African moist forests|
|[en] Le filtrage environnementaledes espèces d'arbres à bois dense controle la biomasse aérienne ligneuse contenues dans les forêts tropicales humides africaines|
|Gourlet-Fleury, Sylvie |
|Rossi, Vivien |
|Réjou-Méchain, Maxime |
|Freycon, Vincent |
|Fayolle, Adeline [Université de Liège - ULg > Forêts, Nature et Paysage > Gestion des ressources forestières et des milieux naturels >]|
|Saint-André, Laurent |
|Cornu, Guillaume |
|Gérard, Jean |
|Sarrailh, Jean-Michel |
|Flores, Olivier |
|Baya, Fidèle |
|Billand, Alain |
|Fauvet, Nicolas |
|Gally, Michel |
|Henry, Matieu |
|Hubert, Didier |
|Pasquier, Alexandra |
|Picard, Nicolas |
|Journal of Ecology|
|Journal of Ecology|
|[en] 1. Regional above-ground biomass estimates for tropical moist forests remain highly inaccurate mostly because they are based on extrapolations from a few plots scattered across a limited range of soils and other environmental conditions. When such conditions impact biomass, the estimation is biased. The effect of soil types on biomass has especially yielded controversial results.
2. We investigated the relationship between above-ground biomass and soil type in undisturbed moist forests in the Central African Republic. We tested the effects of soil texture, as a surrogate for soil resources availability and physical constraints (soil depth and hydromorphy) on biomass. Forest inventory data were collected for trees ≥20 cm stem diameter in 2754 0.5 ha plots scattered over 4888 km². The plots contained 224 taxons, of which 209 were identiﬁed to species. Soil types were characterized from a 1:1 000 000 scale soil map. Species-speciﬁc values for wood density were extracted from the CIRAD’s data base of wood technological properties.
3. We found that basal area and biomass differ in their responses to soil type, ranging from 17.8 m² ha-1 (217.5 t ha-1) to 22.3 m² ha-1 (273.3 t ha-1). While shallow and hydromorphic soils support forests with both low stem basal area and low biomass, forests on deep resource-poor soils are typically low in basal area but as high in biomass as forests on deep resource-rich soils. We demonstrated that the environmental ﬁltering of slow growing dense-wooded species on resource-poor soils compensates for the low basal area, and we discuss whether this ﬁltering effect is due to low fertility or to low water reserve.
4. Synthesis. We showed that soil physical conditions constrained the amount of biomass stored in tropical moist forests. Contrary to previous reports, our results suggest that biomass is similar on resource-poor and resource-rich soils. This ﬁnding highlights both the importance of taking into account soil characteristics and species wood density when trying to predict regional patterns of biomass. Our ﬁndings have implications for the evaluation of biomass stocks in tropical forests, in the context of the international negotiations on climate change.
|Centre de coopération internation pour la recherche agronomique et le développement - CIRAD|
|Union Européenne = European Union - UE = EU|
|Researchers ; Professionals ; Students|
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