Consequence of clear-cutting and drought on deep soil CO2 and N2O profile concentrations and surface fluxes in Brazilian eucalypt plantations

Germon Amandine, Jourdan Christophe, Chapuis-Lardy Lydie, Robin Agnès, Antonio Rosolem C., De Moraes Gonçalves Jose Leonardo, Amaral Guerrini I., Laclau Jean-Paul. 2017. Consequence of clear-cutting and drought on deep soil CO2 and N2O profile concentrations and surface fluxes in Brazilian eucalypt plantations. In : Book of Abstracts IUFRO 125th Anniversary Congress 2017. IUFRO. Baden-Württemberg : Forstliche Versuchs- und Forschungsanstalt (FVA)-IUFRO, Résumé, 385. ISBN 978-3-902762-88-7 125th IUFRO Anniversary Congress, Freiburg, Allemagne, 18 Septembre 2017/22 Septembre 2017.

Résumé : The major factors driving greenhouse gas effluxes from forest soils (substrate supply, temperature, water content) vary with soil depth. Our study aimed to assess the consequences of drought on the temporal variability of CO2 and N2O fluxes throughout very deep soil profiles in Eucalyptus grandis plantations at the end of the rotation and the first 16 months after clear-cut, in coppice. Two treatments were compared: one with 37% of throughfall excluded by plastic sheets (TE), and one without rain exclusion (WE). Every two weeks for 19 months, soil CO2 and N2O surface fluxes were measured using the closed-chamber method and the profile concentrations were measured at 7 depths in the soil down to 15.5m from in each treatment. CO2 and N2O concentrations measured in treatment TE were on average 17.3 and 5.8% lower than in treatment WE, respectively, throughout the soil profile. Across the two treatments, CO2 concentrations increased from 4102 ±2310 ppm at 10cm deep to 14480±2854 ppm at 15.5m and N2O concentrations remained roughly constant down to 15.5m. Improving our understanding of the spatiotemporal dynamics of gas concentrations in deep soil layers is an important issue for the management of tropical planted forests in the context of climate change.

Classification Agris : P40 - Météorologie et climatologie
P33 - Chimie et physique du sol
K10 - Production forestière
P01 - Conservation de la nature et ressources foncières

Auteurs et affiliations

• Germon Amandine, UNESP (BRA)
• Jourdan Christophe, CIRAD-PERSYST-UMR Eco&Sols (FRA) ORCID: 0000-0001-9857-3269
• Chapuis-Lardy Lydie, IRD (FRA)
• Robin Agnès, CIRAD-PERSYST-UMR Eco&Sols (BRA)
• Antonio Rosolem C., UNESP (BRA)
• De Moraes Gonçalves Jose Leonardo, USP (BRA)
• Amaral Guerrini I., UNESP (BRA)
• Laclau Jean-Paul, CIRAD-PERSYST-UMR Eco&Sols (FRA) ORCID: 0000-0002-2506-214X

Source : Cirad-Agritrop (https://agritrop.cirad.fr/586628/)

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