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2. Soil properties explain tree growth and mortality, but not biomass, across phosphorus-depleted tropical forests.

Author

Soong, Jennifer L, Janssens, Ivan A, Grau, Oriol, Margalef, Olga, Stahl, Clément, Van Langenhove, Leandro, Urbina, Ifigenia, Chave, Jerome, Dourdain, Aurelie, Ferry, Bruno, Freycon, Vincent, Herault, Bruno, Sardans, Jordi, Peñuelas, Josep, and Verbruggen, Erik

Subjects
Mycorrhizae, Trees, Carbon, Phosphorus, Soil, Soil Microbiology, Biomass, Tropical Climate, Rainforest, Nutrients, Biochemistry and Cell Biology, Other Physical Sciences
Abstract

We observed strong positive relationships between soil properties and forest dynamics of growth and mortality across twelve primary lowland tropical forests in a phosphorus-poor region of the Guiana Shield. Average tree growth (diameter at breast height) increased from 0.81 to 2.1 mm yr-1 along a soil texture gradient from 0 to 67% clay, and increasing metal-oxide content. Soil organic carbon stocks in the top 30 cm ranged from 30 to 118 tons C ha-1, phosphorus content ranged from 7 to 600 mg kg-1 soil, and the relative abundance of arbuscular mycorrhizal fungi ranged from 0 to 50%, all positively correlating with soil clay, and iron and aluminum oxide and hydroxide content. In contrast, already low extractable phosphorus (Bray P) content decreased from 4.4 to

Published
2020

6. Soil nutrient variation along a shallow catena in Paracou, French Guiana

Author

Van Langenhove, Leandro, Verryckt, Lore T., Stahl, Clement, Courtois, Elodie A., Urbina, Ifigenia, Grau, Oriol, Asensio, Dolores, Peguero, Guille, Margalef, Olga, Freycon, Vincent, Penuelas, Josep, and Janssens, Ivan A.

Subjects
Rain forests -- Evaluation -- French Guiana -- France -- Spain, Soil quality -- Evaluation, Agricultural industry, Earth sciences
Abstract

Tropical forests are generally considered to stand upon nutrient-poor soils, but soil nutrient concentrations and availabilities can vary greatly at local scale due to topographic effects on erosion and water drainage. In this study we physically and chemically characterised the soils of 12 study plots situated along a catena with a shallow slope in a tropical rainforest in French Guiana both during the wet and the dry season to evaluate seasonal differences. Soils along the catena were all Acrisols, but differed strongly in their water drainage flux. Over time, this differential drainage has led to differences in soil texture and mineral composition, affecting the adsorption of various nutrients, most importantly phosphorus. The more clayey soils situated on the slope of the catena had higher total concentrations of carbon, nitrogen, phosphorus and several micronutrients, while extractable nutrient concentrations were highest in the sandiest soils situated at the bottom of the catena. We found that carbon, nitrogen and extractable nutrients all varied seasonally, especially in the surface soil layer. These results are interesting because they show that, even at the local scale, small differences in topography can lead to large heterogeneity in nutrient concentrations, which can have large impacts on plant and microbial community organisation at the landscape level. Keywords: French Guiana, lowland tropical forest, Paracou, phosphorus, topography, water drainage., Introduction Tropical forests display notable heterogeneity in soil nutrient contents (Cuevas and Medina 1986; Vitousek and Sanford 1986; Laurance et al. 1999; Porder et at. 2005; Nardoto et at. 2008; [...]

Published
2021
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7. Regional Soil Profile Data Reveals the Predominant Role of Geomorphology and Geology in Accurately Deriving Digital Soil Texture Maps in a Tropical Area

Author

Khan, Salman, primary, Maréchaux, Isabelle, additional, Vieilledent, Ghislain, additional, Guitet, Stéphane, additional, Brunaux, Olivier, additional, Ferry, Bruno, additional, Soulard, Florian, additional, Stahl, Clément, additional, Baraloto, Christopher, additional, Fortunel, Claire, additional, and Freycon, Vincent, additional

Published
2024
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8. Long-term influence of early human occupations on current forests of the Guiana Shield

Author

Odonne, Guillaume, van den Bel, Martijn, Burst, Maxime, Brunaux, Olivier, Bruno, Miléna, Dambrine, Etienne, Davy, Damien, Desprez, Mathilde, Engel, Julien, Ferry, Bruno, Freycon, Vincent, Grenand, Pierre, Jérémie, Sylvie, Mestre, Mickael, Molino, Jean-François, Petronelli, Pascal, Sabatier, Daniel, and Hérault, Bruno

Published
2019

12. Competition and site weakly explain tree growth variability in undisturbed Central African moist forests

Author

Gourlet‐Fleury, Sylvie, primary, Rossi, Vivien, additional, Forni, Eric, additional, Fayolle, Adeline, additional, Ligot, Gauthier, additional, Allah‐Barem, Félix, additional, Baya, Fidèle, additional, Bénédet, Fabrice, additional, Boyemba, Faustin, additional, Cornu, Guillaume, additional, Doucet, Jean‐Louis, additional, Gillet, Jean‐François, additional, Mazengue, Mathurin, additional, Mbasi Mbula, Michel, additional, Van Hoef, Yorick, additional, Zombo, Isaac, additional, and Freycon, Vincent, additional

Published
2023
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14. Soil carbon storage in croplands, grasslands, forests and wetlands of French overseas territories. State of knowledge and levers for action. Summary for Policymakers March 2023

Author

Fujisaki, Kenji, Teste, Adrien, Thongo Mbou, Armel, Gavazzi, Alma, Ponton, Clara, Moniot, Margot, Acosta-Alba, Ivonne, Montouroy, Yves, Avadi, Angel, Benoist, Anthony, Bréchet, Laëtitia, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Richard, Antoine, Stahl, Clément, Todoroff, Pierre, Vayssières, Jonathan, Heurtaux, Anne, Jannoyer, Magalie, Demenois, Julien, Daguet, Ellie, Blazy, Jean Marc, Albrecht, Alain, Blanfort, Vincent, Freycon, Vincent, Versini, Antoine, Sierra, Jorge, Roggy, Jean-Christophe, Fujisaki, Kenji, Teste, Adrien, Thongo Mbou, Armel, Gavazzi, Alma, Ponton, Clara, Moniot, Margot, Acosta-Alba, Ivonne, Montouroy, Yves, Avadi, Angel, Benoist, Anthony, Bréchet, Laëtitia, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Richard, Antoine, Stahl, Clément, Todoroff, Pierre, Vayssières, Jonathan, Heurtaux, Anne, Jannoyer, Magalie, Demenois, Julien, Daguet, Ellie, Blazy, Jean Marc, Albrecht, Alain, Blanfort, Vincent, Freycon, Vincent, Versini, Antoine, Sierra, Jorge, and Roggy, Jean-Christophe

Published
2023

15. Competition and site weakly explain tree growth variability in undisturbed Central African moist forests

Author

Gourlet-Fleury, Sylvie, Rossi, Vivien, Forni, Eric, Fayolle, Adeline, Ligot, Gauthier, Allah-Barem, Félix, Baya, Fidèle, Bénédet, Fabrice, Boyemba, Faustin, Cornu, Guillaume, Doucet, Jean-Louis, Gillet, Jean-François, Mazengue, Mathurin, Mbasi Mbula, Michel, Van Hoef, Yorick, Zombo, Isaac, Freycon, Vincent, Gourlet-Fleury, Sylvie, Rossi, Vivien, Forni, Eric, Fayolle, Adeline, Ligot, Gauthier, Allah-Barem, Félix, Baya, Fidèle, Bénédet, Fabrice, Boyemba, Faustin, Cornu, Guillaume, Doucet, Jean-Louis, Gillet, Jean-François, Mazengue, Mathurin, Mbasi Mbula, Michel, Van Hoef, Yorick, Zombo, Isaac, and Freycon, Vincent

Abstract

1. Identifying and quantifying factors that influence tree growth are crucial issues to ensure sustainable forest management, particularly in moist tropical forests. Tree growth depends on several factors comprising ontogenic stage, competition by neighbours and environmental conditions. Several studies have focused on one or two of them, but very few have considered all three, especially in Central Africa. We investigated the effects of diameter and competition on tree growth, in four Central African sites characterized by their soil physicochemical properties, at both tree community and population levels. 2. We calibrated growth models using diameter data collected on 29,741 trees between 2015 and 2018, on twelve 4 or 9-ha plots spread over the four sites. These models included diameter, wood density, competition indices and site effect as explainable variables at the community level and excluded wood density at the population level. 3. At the community level, the best models explained 11% of growth variability with a decreasing effect of species wood density, diameter, site and competition. Our results show that even if low, site effect can result from different soil nutrients depending on both tree size and species wood density. We observed higher tree growth on sites with (i) high exchangeable K, organic C, total N and total P for low wood density species; (ii) high available P and C:N for small trees, high exchangeable Ca and Mg for medium to large trees, all belonging to medium and hard wood density species. At the population level, the best models explained between 0 to 43% of growth variability, with significant competition effect (resp. site effect) for 21 (resp. 9) of the 43 species studied. Site ranking varied greatly between the 9 species concerned, probably reflecting different sensitivities to the scarcity of particular soil nutrients. 4. Synthesis. Our study provides original results on the factors influencing tree growth in Central Africa, showing t

Published
2023

16. Chapitre IV. Suivi des Sols

Author

Guerrini, Xavier, De Haldat, Alexandre, Fedelique, Alex, Senecal, Gael, Tella, Marie, Nicolini, Eric-André, Freycon, Vincent, Guerrini, Xavier, De Haldat, Alexandre, Fedelique, Alex, Senecal, Gael, Tella, Marie, Nicolini, Eric-André, and Freycon, Vincent

Abstract

Le chapitre IV du rapport " ForesTreeCulture 2. Plantations forestières en Guyane française " rapporte les résultats de 3 à 5 années de suivi spatialisé des propriétés physico-chimiques des sols sur 3 sites de plantation caractérisés par des historiques et des contextes topographiques et pédoclimatiques différents (pluviométrie, relief, sol).

Published
2023

17. Stocker du carbone dans les sols agricoles et forestiers ultramarins. Synthèse biophysique sur le stockage de carbone dans les sols à La Réunion

Author

Avadi Tapia, Angel Daniel, Teste, Adrien, Bréchet, Laëtitia, Brossard, Michel, Burban, Benoit, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Freycon, Vincent, Richard, Antoine, Roggy, Jean-Christophe, Sierra, Jorge, Stahl, Clément, Tillard, Emmanuel, Thuriès, Laurent, Todoroff, Pierre, Vayssières, Jonathan, Versini, Antoine, Vigne, Mathieu, Fujisaki, Kenji, Demenois, Julien, Albrecht, Alain, Blanfort, Vincent, Blazy, Jean Marc, Avadi Tapia, Angel Daniel, Teste, Adrien, Bréchet, Laëtitia, Brossard, Michel, Burban, Benoit, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Freycon, Vincent, Richard, Antoine, Roggy, Jean-Christophe, Sierra, Jorge, Stahl, Clément, Tillard, Emmanuel, Thuriès, Laurent, Todoroff, Pierre, Vayssières, Jonathan, Versini, Antoine, Vigne, Mathieu, Fujisaki, Kenji, Demenois, Julien, Albrecht, Alain, Blanfort, Vincent, and Blazy, Jean Marc

Published
2023

18. Synthèse biophysique sur le stockage de carbone dans les sols en Guyane - version finale - mars 2023 - dans ' 4 pour 1 000 ' Outre-mer : Stocker du carbone dans les sols agricoles et forestiers ultramarins : état des connaissances et synergies avec la Trajectoire 5.0 en Guadeloupe, en Martinique, en Guyane, à La Réunion, à Mayotte, à Saint-Martin et à Saint-Barthélemy

Author

Demenois, Julien (ed.), Albrecht, Alain (ed.), Blanfort, Vincent (ed.), Blazy, Jean Marc (ed.), Fujisaki, Kenji, Teste, Adrien, Avadi, Angel, Bréchet, Laëtitia, Brossard, Michel, Burban, Benoit, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Freycon, Vincent, Richard, Antoine, Roggy, Jean-Christophe, Sierra, Jorge, Stahl, Clément, Tillard, Emmanuel, Thuriès, Laurent, Todoroff, Pierre, Vayssières, Jonathan, Versini, Antoine, Vigne, Mathieu, Demenois, Julien (ed.), Albrecht, Alain (ed.), Blanfort, Vincent (ed.), Blazy, Jean Marc (ed.), Fujisaki, Kenji, Teste, Adrien, Avadi, Angel, Bréchet, Laëtitia, Brossard, Michel, Burban, Benoit, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Freycon, Vincent, Richard, Antoine, Roggy, Jean-Christophe, Sierra, Jorge, Stahl, Clément, Tillard, Emmanuel, Thuriès, Laurent, Todoroff, Pierre, Vayssières, Jonathan, Versini, Antoine, and Vigne, Mathieu

Published
2023

19. Synthèse biophysique sur le stockage de carbone dans les sols en Guadeloupe

Author

Fujisaki, Kenji, Demenois, Julien, Albrecht, Alain, Blanfort, Vincent, Blazy, Jean Marc, Teste, Adrien, Avadi, Angel, Bréchet, Laëtitia, Brossard, Michel, Burban, Benoit, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Freycon, Vincent, Richard, Antoine, Roggy, Jean-Christophe, Sierra, Jorge, Stahl, Clément, Tillard, Emmanuel, Thuriès, Laurent, Todoroff, Pierre, Vayssières, Jonathan, Versini, Antoine, Vigne, Mathieu, Fujisaki, Kenji, Demenois, Julien, Albrecht, Alain, Blanfort, Vincent, Blazy, Jean Marc, Teste, Adrien, Avadi, Angel, Bréchet, Laëtitia, Brossard, Michel, Burban, Benoit, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Freycon, Vincent, Richard, Antoine, Roggy, Jean-Christophe, Sierra, Jorge, Stahl, Clément, Tillard, Emmanuel, Thuriès, Laurent, Todoroff, Pierre, Vayssières, Jonathan, Versini, Antoine, and Vigne, Mathieu

Published
2023

20. Synthèse biophysique sur le stockage de carbone dans les sols en Martinique

Author

Fujisaki, Kenji, Demenois, Julien, Albrecht, Alain, Blanfort, Vincent, Blazy, Jean Marc, Teste, Adrien, Avadi, Angel, Bréchet, Laëtitia, Brossard, Michel, Burban, Benoit, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Freycon, Vincent, Richard, Antoine, Roggy, Jean-Christophe, Sierra, Jorge, Stahl, Clément, Tillard, Emmanuel, Thuriès, Laurent, Todoroff, Pierre, Vayssières, Jonathan, Versini, Antoine, Vigne, Mathieu, Fujisaki, Kenji, Demenois, Julien, Albrecht, Alain, Blanfort, Vincent, Blazy, Jean Marc, Teste, Adrien, Avadi, Angel, Bréchet, Laëtitia, Brossard, Michel, Burban, Benoit, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Freycon, Vincent, Richard, Antoine, Roggy, Jean-Christophe, Sierra, Jorge, Stahl, Clément, Tillard, Emmanuel, Thuriès, Laurent, Todoroff, Pierre, Vayssières, Jonathan, Versini, Antoine, and Vigne, Mathieu

Published
2023

21. Synthèse biophysique sur le stockage de carbone dans la biomasse aérienne en Guyane - version finale - mars 2023 – dans ' 4 pour 1 000 ' Outre-mer : Stocker du carbone dans les sols agricoles et forestiers ultramarins : état des connaissances et synergies avec la Trajectoire 5.0 en Guadeloupe, en Martinique, en Guyane, à La Réunion, à Mayotte, à Saint-Martin et à Saint-Barthélemy

Author

Demenois, Julien (ed.), Albrecht, Alain (ed.), Blanfort, Vincent (ed.), Blazy, Jean Marc (ed.), Fujisaki, Kenji, Teste, Adrien, Avadi, Angel, Bréchet, Laëtitia, Brossard, Michel, Burban, Benoit, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Freycon, Vincent, Herault, Bruno, Richard, Antoine, Roggy, Jean-Christophe, Sierra, Jorge, Stahl, Clément, Tillard, Emmanuel, Thuriès, Laurent, Todoroff, Pierre, Vayssières, Jonathan, Versini, Antoine, Vigne, Mathieu, Demenois, Julien (ed.), Albrecht, Alain (ed.), Blanfort, Vincent (ed.), Blazy, Jean Marc (ed.), Fujisaki, Kenji, Teste, Adrien, Avadi, Angel, Bréchet, Laëtitia, Brossard, Michel, Burban, Benoit, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Freycon, Vincent, Herault, Bruno, Richard, Antoine, Roggy, Jean-Christophe, Sierra, Jorge, Stahl, Clément, Tillard, Emmanuel, Thuriès, Laurent, Todoroff, Pierre, Vayssières, Jonathan, Versini, Antoine, and Vigne, Mathieu

Published
2023

22. Etude ' 4 pour 1 000 ' Outre-mer - Stocker du carbone dans les sols agricoles et forestiers ultramarins - Etat des connaissances et leviers d'actions dans les départements et régions d'Outre-mer - Rapport final

Author

Fujisaki, Kenji, Teste, Adrien, Thongo M'Bou, Armel, Gavazzi, Alma, Ponton, Clara, Moniot, Margot, Acosta-Alba, Ivonne, Montouroy, Yves, Avadi, Angel, Benoist, Anthony, Bréchet, Laëtitia, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Ozier-Lafontaine, Harry, Richard, A., Stahl, Clément, Todoroff, Pierre, Vayssières, Jonathan, Demenois, Julien, Blazy, Jean Marc, Albrecht, Alain, Blanfort, Vincent, Freycon, Vincent, Versini, Antoine, Sierra, Jorge, Roggy, Jean-Christophe, Fujisaki, Kenji, Teste, Adrien, Thongo M'Bou, Armel, Gavazzi, Alma, Ponton, Clara, Moniot, Margot, Acosta-Alba, Ivonne, Montouroy, Yves, Avadi, Angel, Benoist, Anthony, Bréchet, Laëtitia, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Ozier-Lafontaine, Harry, Richard, A., Stahl, Clément, Todoroff, Pierre, Vayssières, Jonathan, Demenois, Julien, Blazy, Jean Marc, Albrecht, Alain, Blanfort, Vincent, Freycon, Vincent, Versini, Antoine, Sierra, Jorge, and Roggy, Jean-Christophe

Abstract

Coordonnée par le Cirad en partenariat avec INRAE et l'IRD, l'étude ≪ 4 pour 1000 ≫ Outre-mer dresse un bilan inédit des stocks de carbone du sol des territoires ultramarins. Les auteurs formulent des recommandations opérationnelles et de recherche pour preserver ces stocks élevés et répondre aux grands enjeux actuels de l'agriculture face au changement climatique au niveau national et territorial. Si le potentiel des sols métropolitains a fait l'objet d'une evaluation en 2019, celui des territoires ultramarins était jusqu'ici méconnu. Dans le cadre de la présente étude, les auteurs dressent pour la premiere fois un état des lieux des connaissances pour la Guadeloupe, la Martinique, la Guyane, La Reunion, Mayotte, Saint-Martin et Saint-Barthélemy.

Published
2023

23. Stocker du carbone dans les sols agricoles et forestiers ultramarins - Résumé pour décideurs - Etat des connaissances et leviers d'actions dans les départements et régions d'Outre-mer

Author

Fujisaki, Kenji, Teste, Adrien, Thongo Mbou, Armel, Gavazzi, Alma, Ponton, Clara, Moniot, Margot, Acosta-Alba, Ivonne, Montouroy, Yves, Avadi, Angel, Benoist, Anthony, Bréchet, Laëtitia, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Richard, Antoine, Stahl, Clément, Todoroff, Pierre, Vayssières, Jonathan, Heurtaux, Anne, Jannoyer, Magalie, Demenois, Julien, Daguet, Ellie, Blazy, Jean Marc, Albrecht, Alain, Blanfort, Vincent, Freycon, Vincent, Versini, Antoine, Sierra, Jorge, Roggy, Jean-Christophe, Fujisaki, Kenji, Teste, Adrien, Thongo Mbou, Armel, Gavazzi, Alma, Ponton, Clara, Moniot, Margot, Acosta-Alba, Ivonne, Montouroy, Yves, Avadi, Angel, Benoist, Anthony, Bréchet, Laëtitia, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Richard, Antoine, Stahl, Clément, Todoroff, Pierre, Vayssières, Jonathan, Heurtaux, Anne, Jannoyer, Magalie, Demenois, Julien, Daguet, Ellie, Blazy, Jean Marc, Albrecht, Alain, Blanfort, Vincent, Freycon, Vincent, Versini, Antoine, Sierra, Jorge, and Roggy, Jean-Christophe

Published
2023

24. Semantics about soil organic carbon storage: DATA4C+, a comprehensive thesaurus and classification of management practices in agriculture and forestry

Author

Fujisaki, Kenji, Chevallier, Tiphaine, Bispo, Antonio, Laurent, Jean-Baptiste, Thévenin, François, Chapuis-Lardy, Lydie, Cardinael, Rémi, Le Bas, Christine, Freycon, Vincent, Bénédet, Fabrice, Blanfort, Vincent, Brossard, Michel, Tella, Marie, Demenois, Julien, Fujisaki, Kenji, Chevallier, Tiphaine, Bispo, Antonio, Laurent, Jean-Baptiste, Thévenin, François, Chapuis-Lardy, Lydie, Cardinael, Rémi, Le Bas, Christine, Freycon, Vincent, Bénédet, Fabrice, Blanfort, Vincent, Brossard, Michel, Tella, Marie, and Demenois, Julien

Abstract

Identifying the drivers of soil organic carbon (SOC) stock changes is of the utmost importance to contribute to global challenges like climate change, land degradation, biodiversity loss, or food security. Evaluating the impacts of land use and management practices in agriculture and forestry on SOC is still challenging. Merging datasets or making databases interoperable is a promising way, but still has several semantic challenges. So far, a comprehensive thesaurus and classification of management practices in agriculture and forestry has been lacking, especially while focusing on SOC storage. Therefore, the aim of this paper is to present a first comprehensive thesaurus for management practices driving SOC storage (DATA4C+). The DATA4C+ thesaurus contains 224 classified and defined terms related to land management practices in agriculture and forestry. It is organized as a hierarchical tree reflecting the drivers of SOC storage. It is oriented to be used by scientists in agronomy, forestry, and soil sciences with the aim of uniformizing the description of practices influencing SOC in their original research. It is accessible in Agroportal (http://agroportal.lirmm.fr/ontologies/DATA4CPLUS, last access: 24 March 2022) to enhance its findability, accessibility, interoperability, and reuse by scientists and others such as laboratories or land managers. Future uses of the DATA4C+ thesaurus will be crucial to improve and enrich it, but also to raise the quality of meta-analyses on SOC, and ultimately help policymakers to identify efficient agricultural and forest management practices to enhance SOC storage.

Published
2023

26. Synthèse biophysique sur le stockage de carbone dans les sols en Guyane: 4 pour 1 000 » Outre-mer : Stocker du carbone dans les sols agricoles et forestiers ultramarins : état des connaissances et synergies avec la Trajectoire 5.0 en Guadeloupe, en Martinique, en Guyane, à La Réunion, à Mayotte, à Saint-Martin et à Saint-Barthélemy

Author

Demenois, Julien, Albrecht, Alain, Blanfort, Vincent, Blazy, Jean- Marc, Fujisaki, Kenji, Testé, Adrien, Avadi, Angel, Bréchet, Laëtitia, Brossard, Michel, Burban, Benoît, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Freycon, Vincent, Richard, Antoine, Roggy, Jean-Christophe, Sierra, Jorge, Stahl, Clément, Tillard, Emmanuel, Thuriès, Laurent, Todoroff, Pierre, Vayssières, Jonathan, Versini, Antoine, Vigne, Mathieu, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Institut de Recherche pour le Développement (IRD [Réunion]), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Agrosystèmes tropicaux (ASTRO), ADEME, CIRAD, INRAE, and IRD

Subjects
systèmes de culture, forêt, [SDE]Environmental Sciences, 4 p 1000, Guyane, pédoclimat
Abstract

Le présent rapport fait état des connaissances acquises à ce jour par la communauté scientifique sur les stocks de COS du territoire. Il présente ensuite les principaux déterminants à leur variabilité spatiale et temporelle. Il expose pour finir l’effet du changement d’usage des sols, des pratiques agricoles et de gestion forestière.

Published
2023

27. 4 pour 1 000 » Outre-mer : Stocker du carbone dans les sols agricoles et forestiers ultramarins : état des connaissances et synergies avec la Trajectoire 5.0 en Guadeloupe, en Martinique, en Guyane, à La Réunion, à Mayotte, à Saint-Martin et à Saint-Barthélemy

Author

Demenois, Julien, Albrecht, Alain, Blanfort, Vincent, Blazy, Jean- Marc, Fujisaki, Kenji, Testé, Adrien, Avadi, Angel, Bréchet, Laëtitia, Brossard, Michel, Burban, Benoît, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Freycon, Vincent, Hérault, Bruno, Richard, Antoine, Roggy, Jean-Christophe, Sierra, Jorge, Stahl, Clément, Tillard, Emmanuel, Thuriès, Laurent, Todoroff, Pierre, Vayssières, Jonathan, Versini, Antoine, Vigne, Mathieu, Margot, Moniot, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Institut de Recherche pour le Développement (IRD [Réunion]), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Agrosystèmes tropicaux (ASTRO), ADEME, CIRAD, INRAE, and IRD

Subjects
changement climatique, forêt, [SDE]Environmental Sciences, texture du sol, deforestation, changement d'usage, Guyane
Abstract

Avec 95 % de sa surface recouverte de forêt et une démographie croissante entraînant uneaugmentation des besoins en surfaces exploitables, la Guyane présente également de fortsenjeux liés au carbone contenu dans la biomasse forestière. A la demande de l’Ademe, lecarbone aérien (CA) a également été étudié et est présenté dans le présent rapport.

Published
2023

29. Semantics about soil organic carbon storage: DATA4C+, a comprehensive thesaurus and classification of management practices in agriculture and forestry

Author

Fujisaki, Kenji, primary, Chevallier, Tiphaine, additional, Bispo, Antonio, additional, Laurent, Jean-Baptiste, additional, Thevenin, François, additional, Chapuis-Lardy, Lydie, additional, Cardinael, Rémi, additional, Le Bas, Christine, additional, Freycon, Vincent, additional, Bénédet, Fabrice, additional, Blanfort, Vincent, additional, Brossard, Michel, additional, Tella, Marie, additional, and Demenois, Julien, additional

Published
2023
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30. Synthèse biophysique sur le stockage de carbone dans les sols en Martinique: 4 pour 1 000 » Outre-mer : Stocker du carbone dans les sols agricoles et forestiers ultramarins : état des connaissances et synergies avec la Trajectoire 5.0 en Guadeloupe, en Martinique, en Guyane, à La Réunion, à Mayotte, à Saint-Martin et à Saint-Barthélemy

Author

Demenois, Julien, Albrecht, Alain, Blanfort, Vincent, Blazy, Jean- Marc, Fujisaki, Kenji, Avadi, Angel, Bréchet, Laëtitia, Brossard, Michel, Burban, Benoît, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Freycon, Vincent, Richard, Antoine, Roggy, Jean-Christophe, Sierra, Jorge, Stahl, Clément, Tillard, Emmanuel, Thuriès, Laurent, Todoroff, Pierre, Vayssières, Jonathan, Versini, Antoine, Vigne, Mathieu, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Institut de Recherche pour le Développement (IRD [Réunion]), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Agrosystèmes tropicaux (ASTRO), ADEME, and CIRAD, IRD, INRAE

Subjects
Martinique -- France, [SDE]Environmental Sciences, pratiques, 4 p 1000, système de culture, pédoclimat
Abstract

L’objectif de cette synthèse est de fournir un état des lieux des travaux réalisés sur le stockage decarbone organique des sols (COS) en Martinique. Compte tenu des données disponibles, lesthématiques suivantes sont développées dans ce document, après avoir une présentation du contextebiophysique du territoire :- Déterminants des stocks de COS et spatialisation des stocks de COS ;- Effet des changements d’usage des sols sur les stocks de COS ;- Effet des changements de pratiques de gestion des sols sur les stocks de COS.

Published
2023

31. Stocker du carbone dans les sols agricoles et forestiers ultramarins - Résumé pour décideurs - Etat des connaissances et leviers d'actions dans les départements et régions d'Outre-mer

Author

Demenois, Julien, Daguet, Ellie, Blazy, Jean Marc, Albrecht, Alain, Blanfort, Vincent, Freycon, Vincent, Versini, Antoine, Sierra, Jorge, Roggy, Jean-Christophe, Fujisaki, Kenji, Teste, Adrien, Thongo Mbou, Armel, Gavazzi, Alma, Ponton, Clara, Moniot, Margot, Acosta-Alba, Ivonne, Montouroy, Yves, Avadi, Angel, Benoist, Anthony, Bréchet, Laëtitia, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Richard, Antoine, Stahl, Clément, Todoroff, Pierre, Vayssières, Jonathan, Heurtaux, Anne, and Jannoyer, Magalie

Published
2023

32. Etude ' 4 pour 1 000 ' Outre-mer - Stocker du carbone dans les sols agricoles et forestiers ultramarins - Etat des connaissances et leviers d'actions dans les départements et régions d'Outre-mer - Rapport final

Author

Demenois, Julien, Blazy, Jean Marc, Albrecht, Alain, Blanfort, Vincent, Freycon, Vincent, Versini, Antoine, Sierra, Jorge, Roggy, Jean-Christophe, Fujisaki, Kenji, Teste, Adrien, Thongo M'Bou, Armel, Gavazzi, Alma, Ponton, Clara, Moniot, Margot, Acosta-Alba, Ivonne, Montouroy, Yves, Avadi, Angel, Benoist, Anthony, Bréchet, Laëtitia, Chevallier, Tiphaine, Chotte, Jean-Luc, Derroire, Géraldine, Dorel, Marc, Feder, Frédéric, Fernandes, Paula, Ozier-Lafontaine, Harry, Richard, A., Stahl, Clément, Todoroff, Pierre, and Vayssières, Jonathan

Abstract

Coordonnée par le Cirad en partenariat avec INRAE et l'IRD, l'étude ≪ 4 pour 1000 ≫ Outre-mer dresse un bilan inédit des stocks de carbone du sol des territoires ultramarins. Les auteurs formulent des recommandations opérationnelles et de recherche pour preserver ces stocks élevés et répondre aux grands enjeux actuels de l'agriculture face au changement climatique au niveau national et territorial. Si le potentiel des sols métropolitains a fait l'objet d'une evaluation en 2019, celui des territoires ultramarins était jusqu'ici méconnu. Dans le cadre de la présente étude, les auteurs dressent pour la premiere fois un état des lieux des connaissances pour la Guadeloupe, la Martinique, la Guyane, La Reunion, Mayotte, Saint-Martin et Saint-Barthélemy.

Published
2023

40. Macrotermes termite mounds influence the spatial pattern of tree species in two African rainforest sites, in northern Congo. But were they really forests in the past?

Author

Penel, Benoit, Freycon, Vincent, Marcon, Eric, Rossi, Vivien, Cornu, Guillaume, Bénédet, Fabrice, Forni, Eric, Gourlet-Fleury, Sylvie, Penel, Benoit, Freycon, Vincent, Marcon, Eric, Rossi, Vivien, Cornu, Guillaume, Bénédet, Fabrice, Forni, Eric, and Gourlet-Fleury, Sylvie

Abstract

Termite mounds have been poorly studied in tropical rainforest in contrast to those of savannahs where they create fertility hotspots and influence the spatial pattern of vegetation. An inventory of termite mounds and of 15 tree species with a diameter at breast height ≥ 10 cm was carried out in two 800-ha blocks, in two rainforest sites located in northern Congo. We used inhomogeneous and intertype K functions to study the spatial pattern of termite mounds and of tree species around mounds, respectively. We found that mounds in Loundoungou were over-dispersed within a radius of less than 70 m, while those in Mokabi were randomly spaced. Tree species within a 20-m radius around a mound were aggregated towards the mound, e.g. Entandrophragma cylindricum, randomly distributed, or even repulsed by the mound. The specific responses also differed in the two sites. These results suggest that (i) the mounds in Loundoungou were created by savannah termite species 3,000-2,000 years BP during the Late Holocene Rainforest Crisis and (ii) the mounds in Mokabi are characteristic of forest mounds. The impact of termite mounds on the spatial pattern of tree species is thus site-dependent, and these differences might be due to species seed dispersal strategies and to soil calcium concentrations.

Published
2022

41. Les plantations forestières en Afrique centrale

Author

Bertaux, Paul, Baltzer, Carla, Angulo, Jessenia, Bosworth, Charlie, Clinquart, Pierre, Diangana, Daniel, Dubiez, Emilien, Fleming, Timothy, Freycon, Vincent, Goma, Maurice, Harmand, Jean-Michel, Henson, Michael, Howard, Mike, Matkovich, Shauna D., Moukini, Régis, Mushiete, Olivier, Ndikumagenge, Cléto, Ndabirorere, Salvatore, Pahkasalo, Tapani, Peltier, Régis, Van Den Plas, Robert, Smith, Andries, Silva, Luis N., Tieguhong, Julius C., Eba'a Atyi, Richard, Bertaux, Paul, Baltzer, Carla, Angulo, Jessenia, Bosworth, Charlie, Clinquart, Pierre, Diangana, Daniel, Dubiez, Emilien, Fleming, Timothy, Freycon, Vincent, Goma, Maurice, Harmand, Jean-Michel, Henson, Michael, Howard, Mike, Matkovich, Shauna D., Moukini, Régis, Mushiete, Olivier, Ndikumagenge, Cléto, Ndabirorere, Salvatore, Pahkasalo, Tapani, Peltier, Régis, Van Den Plas, Robert, Smith, Andries, Silva, Luis N., Tieguhong, Julius C., and Eba'a Atyi, Richard

Abstract

La demande de bois augmente partout dans le monde et cette tendance va inévitablement s'accélérer durant le XXIe siècle pour les débouchés traditionnels, mais aussi les secteurs de la construction (36 % des émissions de gaz à effet de serre), de la bioénergie, de la chimie verte et de toutes les industries qui chercheront progressivement à se biosourcer et à se décarboner dans le cadre de l'avènement d'une économie verte durable et relocalisée près de ses ressources et des marchés locaux.

Published
2022

42. Livrable ANR DATA4C+ - Règles de bonnes pratiques pour décrire les données contenues dans les bases de données sur le carbone du sol du Cirad, d'INRAE et de l'IRD et les renseigner de manière homogène

Author

Fujisaki, Kenji, Chevallier, Tiphaine, Bispo, Antonio, Laurent, Jean-Baptiste, Thévenin, François, Chapuis-Lardy, Lydie, Cardinael, Rémi, Le Bas, Christine, Freycon, Vincent, Bénédet, Fabrice, Tella, Marie, Demenois, Julien, Fujisaki, Kenji, Chevallier, Tiphaine, Bispo, Antonio, Laurent, Jean-Baptiste, Thévenin, François, Chapuis-Lardy, Lydie, Cardinael, Rémi, Le Bas, Christine, Freycon, Vincent, Bénédet, Fabrice, Tella, Marie, and Demenois, Julien

Published
2022

43. Typology and dynamics of agroforestry systems in the mountains of Timor Leste

Author

Cogne, Marguerite, Freycon, Vincent, Piponiot-Laroche, Camille, Peltier, Régis, Cogne, Marguerite, Freycon, Vincent, Piponiot-Laroche, Camille, and Peltier, Régis

Abstract

In Timor-Leste, a country located in the south-east of the Indonesian archipelago, GIZ has initiated a project with the aim of developing agroforestry systems (AFS) that are productive, profitable and preserve natural resources. Since 2020, CIRAD researchers have joined the project wishing to describe the diversity of traditional AFS existing in the country. In the Baucau region, located in the north-east of the country, at altitudes 0-1500 m, with rainfall 1000-2000 mm/year, first inventories and surveys have identified 5 types of AFS which vary greatly in function of their tree density. From the lowest to the highest tree density system: i) Crop system including a Fallow phase (3 months to 10 years), ii) SylvoPastoral system; iii) Young Agroforest; iv) Home Garden; v) Forest Garden. Further biomass inventories, soil observations and sampling, participative mapping activities along with Peeble Score Methods and semi-structured interviews contributed to characterize the AFS at a socio-economic, ecological and agricultural practices level.The AFS evolution hypothesis is that they become denser over time, with an increase in biodiversity. However, it has been observed that home and forest gardens are often managed by older people for varied but self-consumed crops, whereas young people are looking for crops that are more marketable and easier to cultivate in non-agroforestry systems. In order to avoid the clearing of these AFS, it is necessary to look for methods to intensify production, adapt it to the needs of young people and valorise the products. Finally, AFS are also markers of the complex social order between families in the same village or with other villages: concerning the sharing of tasks, ownership and exploitation of land products. It is essential to take these factors into account if continued external support is to be provided.

Published
2022

45. New evidence on the role of past human activities and edaphic factors on the fine-scale distribution of an important timber species: Cylicodiscus gabunensis Harms

Author

Ndonda Makemba, Romaric, Moupela, Christian, Tosso, Félicien, Brostaux, Yves, Drouet, Thomas, Oslisly, Richard, Freycon, Vincent, Doucet, Jean-Louis, Ndonda Makemba, Romaric, Moupela, Christian, Tosso, Félicien, Brostaux, Yves, Drouet, Thomas, Oslisly, Richard, Freycon, Vincent, and Doucet, Jean-Louis

Abstract

Despite the implementation of management plans, commercial tree species densities are declining in the forests of Central Africa. In the region, Cylicodiscus gabunensis Harms (Fabaceae-Caesalpinioideae; common name ‘okan’), is one such species most exploited, but its ecology remains poorly understood. The rarity of its regeneration in evergreen forest suggests that, like other commercial light-demanding species, the conditions that allowed populations to become established are no longer present. Using a combined archaeobotanical and pedological approach, the aim of this study is to identify the factors explaining the current distribution of C. gabunensis individuals at local scale. Within a plot of 1050 ha in a forest concession in south-eastern Gabon, we installed 40 archaeological pits equally divided between sites with and without C. gabunensis. The artefacts encountered were collected and analysed. Charcoal masses were quantified and 18 charcoals were dated. These ages were compared with the average age of the tree population, using growth data from 50 individuals and heartwood dating from 4 individuals. An analysis of the physico-chemical properties of the soil was carried out on composite samples from each archaeological pit. Pottery sherds were found in two pits while charcoal was present in all pits, suggesting widespread human occupation and fire throughout the study area. Human occupation occurred in two phases: between 2480 and 1010 BP and from 590 to 80 BP. The abandonment of agricultural land at the end of this second phase could coincide with the establishment of the C. gabunensis cohort whose average age has been estimated at between 90 and 148 years. Soil analyses showed that C. gabunensis individuals were located on soils that were comparatively richer in element potentially toxic (Fe) and in some plant nutrients (K, P) and total nitrogen. The current scarcity of young trees argues for the implementation of a silviculture that integrates the light r, SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2022

46. Automated landform classification and mapping using a combined textural-morphometric approach: The Congo basin and surroundings

Author

Viennois, Gaëlle, Bétard, François, Freycon, Vincent, Barbier, Nicolas, Couteron, Pierre, Viennois, Gaëlle, Bétard, François, Freycon, Vincent, Barbier, Nicolas, and Couteron, Pierre

Abstract

An automatic method of landform mapping applicable to large continental areas is presented, based on 30-meter SRTM (Shuttle Radar Topography Mission) data and combining texture analysis using Fourier 2D periodograms (FOTO method) with a set of morphometric variables. This integrated strategy was applied to the whole Congo Basin and adjacent regions in Central Africa, where landscapes and landforms mapping remains heterogeneous and partial with existing expert maps differing in aims and scales. Through the FOTO method, a principal component analysis (PCA) on obtained Fourier r-spectra yielded six textural features, which were further combined with seven morphometric criteria into a global PCA. A k-means classification from these output results provided an automatic mapping of 12 landform classes (at a final resolution of 900 m) which were successfully interpreted in terms of geomorphological meaning together with some hydrological and soil attributes. Finally, comparison of our landform map with existing, independent geomorphological sheets revealed a good spatial congruence. Overall, our method proved effective to depict landform assemblages at regional or continental scales based on complementary textural information and morphometric parameters. As such, it could serve as a sound basis for further predicting and mapping soil units at the landscape scale, given the close soil-landform imbrications and interactions at the catena level. It could serve as well as a predictive variable for biodiversity measures and biomass estimates, especially in the humid tropics where environmental data are lacking whilst ecological modelling is urgently needed to support land planning and forest management.

Published
2022

48. Supplementary material to "Semantics about soil organic carbon storage: DATA4C+, a comprehensive thesaurus and classification of management practices in agriculture and forestry"

Author

Fujisaki, Kenji, primary, Chevallier, Tiphaine, additional, Bispo, Antonio, additional, Laurent, Jean-Baptiste, additional, Thévenin, François, additional, Chapuis-Lardy, Lydie, additional, Cardinael, Rémi, additional, Le Bas, Christine, additional, Freycon, Vincent, additional, Bénédet, Fabrice, additional, Blanfort, Vincent, additional, Brossard, Michel, additional, Tella, Marie, additional, and Demenois, Julien, additional

Published
2022
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49. Semantics about soil organic carbon storage: DATA4C+, a comprehensive thesaurus and classification of management practices in agriculture and forestry

Author

Fujisaki, Kenji, primary, Chevallier, Tiphaine, additional, Bispo, Antonio, additional, Laurent, Jean-Baptiste, additional, Thévenin, François, additional, Chapuis-Lardy, Lydie, additional, Cardinael, Rémi, additional, Le Bas, Christine, additional, Freycon, Vincent, additional, Bénédet, Fabrice, additional, Blanfort, Vincent, additional, Brossard, Michel, additional, Tella, Marie, additional, and Demenois, Julien, additional

Published
2022
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