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Article

Soil N2O, CH4, and CO2 Fluxes in Forest, Grassland, and Tillage/No-Tillage Croplands in French Guiana (Amazonia)

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Terres Inovia, 78850 Thiverval-Grignon, France
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Université de Lorraine, AgroParisTech, INRA, Silva, 54000 Nancy, France
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Terres Inovia, 31326 Castanet-Tolosan, France
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Eco&Sols, Université de Montpellier, CIRAD, INRA, IRD, Montpellier SupAgro, 34060 Montpellier, France
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Terres Inovia, 97355 Macouria, Guyane française
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Chambre d’Agriculture de Guyane, 97333 Cayenne CEDEX, Guyane française
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Agroécologie, AgroSup Dijon, INRA, Université de Bourgogne, Université de Bourgogne Franche-Comté, 21000 Dijon, France
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Terres Inovia, Eco&Sols, Université de Montpellier, CIRAD, INRA, IRD, Montpellier SupAgro, Campus de La Gaillarde, 34060 Montpellier, France
*
Author to whom correspondence should be addressed.
Soil Syst. 2019, 3(2), 29; https://doi.org/10.3390/soilsystems3020029
Received: 6 December 2018 / Revised: 14 March 2019 / Accepted: 29 March 2019 / Published: 11 April 2019
The agricultural landscape of French Guiana (Amazonia) is expected to undergo substantial change as a result of rapid population growth in the region. Such changes in the landscape will lead to the conversion of tropical forests into land destined for agricultural use. Little information is available on the effect of different agricultural systems on greenhouse gas (GHG) emissions in French Guiana. For our experiment, two hectares of forest were cleared, without the use of fire, at the Combi experimental site (sandy-clayey Ferralsol) at the end of 2008. After one year with legume and grass cover, the site was modified to include the following three fertilized agricultural systems: (1) Grassland (Brachiaria ruziziensis, mowed), (2) cropland (maize/soybean rotation) with disc tillage, and (3) cropland (maize/soybean rotation) with no-tillage in direct seeding. Soil N2O, CH4, and CO2 fluxes were measured with dark chambers from May 2011 to November 2014. Our results show that grassland was a significantly lower emitter of N2O but a significantly higher emitter of CH4 compared to the two cropland systems studied. We did not observe significant differences between the two cropland systems for N2O and CH4 fluxes. Measurements of the net ecosystem CO2 exchange would be useful to better compare the role of different agricultural systems as a source of GHGs. View Full-Text
Keywords: Amazonia; soil CO2, CH4, and N2O fluxes; Ferralsol; fertilized annual crops; fertilized grassland; French Guiana; land-use change; sandy-clayey soil; tropical forest Amazonia; soil CO2, CH4, and N2O fluxes; Ferralsol; fertilized annual crops; fertilized grassland; French Guiana; land-use change; sandy-clayey soil; tropical forest
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MDPI and ACS Style

Petitjean, C.; Le Gall, C.; Pontet, C.; Fujisaki, K.; Garric, B.; Horth, J.-C.; Hénault, C.; Perrin, A.-S. Soil N2O, CH4, and CO2 Fluxes in Forest, Grassland, and Tillage/No-Tillage Croplands in French Guiana (Amazonia). Soil Syst. 2019, 3, 29. https://doi.org/10.3390/soilsystems3020029

AMA Style

Petitjean C, Le Gall C, Pontet C, Fujisaki K, Garric B, Horth J-C, Hénault C, Perrin A-S. Soil N2O, CH4, and CO2 Fluxes in Forest, Grassland, and Tillage/No-Tillage Croplands in French Guiana (Amazonia). Soil Systems. 2019; 3(2):29. https://doi.org/10.3390/soilsystems3020029

Chicago/Turabian Style

Petitjean, Caroline, Cécile Le Gall, Célia Pontet, Kenji Fujisaki, Bernard Garric, Jean-Claude Horth, Catherine Hénault, and Anne-Sophie Perrin. 2019. "Soil N2O, CH4, and CO2 Fluxes in Forest, Grassland, and Tillage/No-Tillage Croplands in French Guiana (Amazonia)" Soil Systems 3, no. 2: 29. https://doi.org/10.3390/soilsystems3020029

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