Carbon, water and nutrient balances of a Eucalyptus grandis plantation in Brazil over 5 years

Nouvellon Yann, Stape Jose Luiz, Bonnefond J., Le Maire Guerric, Christina Mathias, Campoe Otavio, Hakamada Rodrigo, Loos R., Bouillet Jean-Pierre, Laclau Jean-Paul. 2014. Carbon, water and nutrient balances of a Eucalyptus grandis plantation in Brazil over 5 years. International Forestry Review, 16 (5), n.spéc. XXIV IUFRO World Congress abstracts, Résumé : p. 258. IUFRO World Congress. Sustaining Forests, Sustaining People: The Role of Research. 24, Salt Lake City, États-Unis, 5 Octobre 2014/11 Octobre 2014.

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Quartile : Q3, Sujet : FORESTRY

Résumé : Eucalyptus grandis plantations in Brazil are among the most productive forests of the world, reaching mean annual increments of about 50 m3/ha/yr over short (6 yr) rotations. Carbon, water, and nutrients budgets in one of these plantations were investigated through continuous eddy-covariance measurements of water vapor and CO2 fluxes over a 5-yr period encompassing two successive rotations (2 yr before and 3 yr after harvesting and replanting), with measurements of water table depth, soil water content to a depth of 10 m, and concentrations of nutrients in soil solutions. Before clearcutting, fine roots were found to a depth of 16 m. No seepage occurred below 5 m. Actual evapotranspiration (AET) was approximately equal to annual precipitation (1350 mm). Clearcutting resulted in a strong decrease in AET, a recharge of deep soil layers, and a rise in the water table. By the third year after replanting, the rapid increase in AET supported by the fast expansion of roots led to soil water depletion to a depth of 10 m. Clearcutting turned the forest from a strong C sink (net ecosystem productivity of about 1 tonne C/ha/month) into a C source, but the plantation turned back to a C sink from 7 months after replanting onwards.

Mots-clés Agrovoc : Eucalyptus grandis, bilan hydrique, équilibre nutritif (plante), plantation forestière, évapotranspiration, analyse de covariance

Mots-clés géographiques Agrovoc : Brésil

Mots-clés complémentaires : covariance des turbulences

Mots-clés libres : Eddy-covariance, Water vapor, CO2, Fluxes, Evapotranspiration

Classification Agris : F60 - Physiologie et biochimie végétale

Champ stratégique Cirad : Axe 2 (2014-2018) - Valorisation de la biomasse

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