Publications des agents du Cirad

Cirad

Climate seasonality limits carbon assimilation and storage in tropical forests

Wagner F., Hérault B., Bonnal D., Stahl C., Anderson L.O., Baker T.R., Becker G.S., Beeckman H., Boanerges Souza D., Botosso P.C., Bowman D.M.J.S., Bräuning A., Brede B., Brown F.I., Camarero J.J., Barbosa de Camargo P., Cardoso F.C.G., Alvim Carvalho F., Castro W., Koloski Chagas R., Chave J., Chidumayo E.N., Clark D.A., Capellotto Costa F.R., Couralet C., da Silva Mauricio P.H., Dalitz H., Resende de Castro V., de Freitas Milani J.E., de Oliveira E.C., de Souza Arruda L., Devineau J.L., Drew D.M., Dünisch O., Durigan G., Elifuraha E., Fedele M., Ferreira Fedele L., Figueiredo Filho A., Guimarães Finger C.A., Franco A.C., Freitas Júnior J.L., Galvão F., Gebrekirstos A., Gliniars R., de Alencastro Graça P.M.L., Griffiths A.D., Grogan J., Guan K., Homeier J., Kanieski M.R., Khoon Kho L., Koenig J., kohler S.V., Krepkowski J., Lemos-Filho J.P., Lieberman D., Lieberman M.E., Lisi C.S., Longhi Santos T., López Ayala J.L., Eijji Maeda E., Malhi Y., Maria V.R.B., Marques M.C.M., Marques R.,. 2016. Biogeosciences, 13 (8) : p. 2557-2562.

The seasonal climate drivers of the carbon cycle in tropical forests remain poorly known, although these forests account for more carbon assimilation and storage than any other terrestrial ecosystem. Based on a unique combination of seasonal pan-tropical data sets from 89 experimental sites (68 include aboveground wood productivity measurements and 35 litter productivity measurements), their associate canopy photosynthetic capacity (enhanced vegetation index, EVI) and climate, we ask how carbon assimilation and aboveground allocation are related to climate seasonality in tropical forests and how they interact in the seasonal carbon cycle. We found that canopy photosynthetic capacity seasonality responds positively to precipitation when rainfall is < 2000 mm.yr?1 (water-limited forests) and to radiation otherwise (light-limited forests); on the other hand, independent of climate limitations, wood productivity and litterfall are driven by seasonal variation in precipitation and evapotranspiration respectively. Consequently, light-limited forests present an asynchronism between canopy photosynthetic capacity and wood productivity. Precipitation first-order control indicates an overall decrease in tropical forest productivity in a drier climate. (Résumé d'auteur)

Mots-clés : forêt tropicale; séquestration du carbone; cycle du carbone; climat; saison; écosystème forestier; photosynthèse; production; bois; litière forestière; Évapotranspiration; pluviométrie; lumière; indice de surface foliaire; monde; amazonie

Thématique : Foresterie - Considérations générales; Physiologie et biochimie végétales

Documents associés

Article de revue

Agents Cirad, auteurs de cette publication :