Caroline Petitjean

PhD defended on June, 17th 2013.

Measures and simulations of nitrous oxide emissions:assessment of environmental impact of cultivation after deforestation in French Guiana

Land-use change impacts the functioning of biogeochemical cycles of elements (carbon, nitrogen) and can induce modifications in emissions of gases like nitrous oxide (N2O), a potent greenhouse gas.

In French Guiana, the long-term purpose of CETIOM (Centre Technique des Oléagineux et du Chanvre Industriel) is to develop farming after deforestation with least negative environmental impact.

The present research deals with assessing environmental costs of cultivation after deforestation, especially on nitrous oxide emissions through measures in fields and simulations by modelization with NOE (nitrous oxide emissions) [1]. This model has already been used in Costa Rica [2] and could be adapted for climate and soil characteristics found in French Guiana.

In this study, we compare different agronomical techniques. Cultivation is considered as change in land use and the natural surrounding forest is considered as reference ecosystem for microbial activities and gas emissions, assuming that it represents the pre-disturbance condition of cultivated area.

[1Hénault C, Bizouard F, Laville P, Gabrielle B, Nicoullaud B, Germon JC, Cellier P. (2005) Predicting in situ soil N2O emission using NOE algorithm and soil database. Global change biology, 11, p115-127

[2Hergoualc’h, K. (2008) Emissions de gaz à effet de serre par le sol et stockage de carbone en caféiculture conduite sur des Andosols en climat tropical. Ecole Doctorale SIBAGHE, Montpellier SupAgro, Université Montpellier 2. Doctorat, 229p

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