Stock de carbone dans les gros débris ligneux végétaux : cas des forêts tropicales pluvieuses de la Likouala, République du Congo

In order to improve the knowledge of the functioning of tropical rainfall forests in the Congo basin ,a study on the quantification of the stocks of carbon in coarse woody debris was done in Likouala’s area, in Republic of Congo. To achieve this goal,14 squares plots of 50mx50m had installed on the whole study area, including ten plots in primary forest and four in secondary forests. The method used was to make an inventory of woody debris lying on the ground or Log and snags in the different study plots. There sults of this study revealed average stocks of 603.45kg MS.ha -1 in primary forests, 468.64 kg MS.ha-1 in secondaryforestsand392.68 kgMS.ha- 1 in agroforestry, with no significant differences between stocks in primary forests and secondary forests (P = 0.05). In addition this study revealed that carbon stocks varied from one locality to another in all the study area, as well as between the experimental plots (p = 0.005). This study helps to understand that the Chablis played a key role in the production of large woody debris

Changement De Couverture Forestière Dans Le Département De La Likouala (République Du Congo) Durant La Période De 1986 À 2015

A study on the change of forest cover was carried out in the Department of Likouala, Republic of Congo for the period from 1986 to 2015. It was intended to calculate the areas of the different land conversions in the study period, but also to identify the causes of deforestation and forest land Landsat TM (1986), Etm + (2001), and Oli (2015) images were treated with the method of supervised classification "Maximum Likelihood" was applied to obtain the different maps of land type. The results revealed the lost of forest, with 133.624 hectares of intact forests in1986, 126980.89 ha of intact forests in 2001 and 114.166 ha of intact forests in 2015. There were also increases and regressions in areas of other types of land tenure. This study shows that agriculture is the main driving force for the conversion of forest land to non-forest land. Given the importance of the coverage of lost forests, it appears urgent to strengthen the sustainable management of these ecosystems with a view to combating climate change

Dynamique du carbone organique du sol et de l’azote dans une chronoséquence de plantation de Acacia auriculiformis A. Cunn. ex Benth. (Fabaceae), à Bambou-Mingali (République du Congo)

Dans le contexte international de réchauffement global, plusieurs initiatives sont prises par les pays, les organismes internationaux pour apporter une réponse appropriée qui permettrait de limiter la hausse de la température à 1,5° C, comme le recommande le rapport 1,5° du GIEC. La République du Congo est un pays fortement engagé dans les questions de lutte contre les changements climatiques à travers la gestion durable de ses forêts, la mise en place des plantations domaniales et industrielles, à base d’espèces endogènes et exotiques à croissance rapide dont de Acacia auriculiformis A. Cunn. ex Benth. Pour évaluer l’impact des plantations de Acacia auriculiformis A. Cunn. ex Benth sur la restitution du carbone et de l’azote au sol, une étude portant sur la dynamique du carbone et de l’azote organique du sol dans les plantations de la réserve foncière de Bambou-Mingali a été réalisée. Des échantillons de sol ont été prélevés sur les horizons 0-15 cm et 15-30 cm, d’une chronoséquence de 2, 3, 4, 5, 6, 7, et 8 ans de celles-ci ainsi que sur une savane pure, conformément aux directives du GIEC qui encouragent de collecter les échantillons sol entre 0 et 30 cm de profondeur. L’objectif général de ce travail a été d’évaluer le stock de carbone organique du sol sur une chronoséquence de sept âges de plantations de Acacia auriculiformis A. Cunn. ex Benth.  In the international context of global warming, several initiatives are taken by countries, international organizations to provide an appropriate response that would limit the rise in temperature to 1.5 ° C, as recommended by the 1.5 report of the IPCC. The Republic of the Congo is a country strongly committed to issues of the fight against climate change through the sustainable management of its forests, the establishment of state and industrial plantations, based on endogenous and exotic species with rapid growth, including Acacia auriculiformis A. Cunn. ex Benth. To assess the impact of Acacia auriculiformis A. Cunn plantations. ex Benth on the return of carbon and nitrogen to the soil, a study on the dynamics of carbon and organic nitrogen in the soil in the plantations of the Bambou-Mingali land reserve was carried out. Soil samples were taken on the 0-15 cm and 15-30 cm horizons, with a chronosequence of 2, 3, 4, 5, 6, 7, and 8 years of these as well as on a pure savanna, in accordance with IPCC guidelines which encourage collecting soil samples between 0 and 30 cm depth. The general objective of this work was to assess the stock of organic carbon in the soil over a chronosequence of seven planting ages of Acacia auriculiformis A. Cunn. ex Benth.. The soil samples collected by horizon and by plot were sieved, dried and conditioned in plastic bags for laboratory determination of carbon and total nitrogen by the Walkey and Black and Kjeldahl methods, respectively. The results obtained revealed an age effect on the nitrogen (P = 0.07619), carbon (P = 0.0050) and carbon stock (P = 0.0067) contents. The nitrogen and carbon contents as well as the soil organic carbon stocks were higher in the 8-year-old plantation with averages of 1.25 ± 0.33 mgN respectively. g-1; 15.87 ± 6.08 mgC.g-1 and 28.70 ± 9.48 t.ha-1 and lower in the 6-year-old plot respectively at 0.93 ± 0.05 mgN.g-1; 7.87 ± 0.58 mgC.g-1 and 15.57 ± 1.31 t.ha-1. The study also revealed a horizon effect on carbon and nitrogen contents with respective P-values of 0.0019 and 0.00015. The H0 horizon (0-15 cm) presented the highest stocks whatever the age of the plantation with an average of 32.98 ± 6.56 t.ha-1 in the 8-year-old plot against 16, 46 ± 1.13 t.ha-1 in the 6-year-old plot and on the H1 horizon (15-30 cm) an average of 24.42 ± 11.26 t.ha-1 in the 8-year-old plot against 14 , 69 ± 0.83 t.ha-1 in the 6-year-old plot. Also the C / N ratio is influenced by the age (P-value = 0.008) of the plantation and not by the horizon (P-value = 0.1243). Whatever the parameter considered, it emerges that age influences the return of carbon and nitrogen to the soil. Thus, there is an accumulation of carbon in the plantations of the Acacia auriculiformis chronosequence

Amount of Soil Carbon Stock within Primary and Secondary Forest in the North of the Republic of Congo

The amount of carbon stock under different land type’s cover was studied in the north east of Republic of Congo. Samples of soil from the surface 0-15 cm horizon were collected under 12 land types classes. Results showed that the lowest soil C was noted in flooded primary forests of Lophira alata Banks ex Gaertu. With an amount of 17.21 t C ha-1, and the highest values were noted in the savanna of Jardinea congoensis with an amount of 117.6 t C ha-1 and the primary forest of Guibourtia demeusei (Harms) Léon. With 116.16 t C ha-1 (p < 0.05).Our study revealed the importance of carbon stock in different type of land in tropical area to reduce the emission of CO2 from the conversion of forestland to another type of land

Diversité floristique et dynamique de reconstitution de la forêt du Parc Zoologique sous plantations à eucalyptus à Brazzaville, Congo

La forêt du Parc Zoologique est l’une des forêts naturelles reliques intra urbaines de la ville de Brazzaville. Cet écosystème subit une pression anthropique due aux besoins croissants en bois énergie, en bois d’artisanat et en plantes utilisées en phytothérapie. Les zones les plus dégradées ont été reboisées en eucalyptus. Il a été constaté que dans le sous bois des forêts à eucalyptus, se réalise la reconstitution de la forêt naturelle. Une étude diachronique a été effectuée pour suivre cette reconstitution. Des placettes de 600 m² d’âges différents ont été délimitées dans ces plantations, dans lesquelles ont été notées toutes espèces de forêt naturelle existantes, leurs diamètres à la hauteur de la poitrine et leur nombre d’individus. Les résultats obtenus montrent que les types morphologiques des ligneux augmentent avec l’âge de la plantation d’eucalyptus tandis que les formes herbacées décroissent avec l’augmentation de l’âge. De même, le nombre de types biologiques varient avec l’âge de la plantation à eucalyptus. En suivant les trois espèces dominantes de cette forêt naturelle (Millettia laurentii et Markhamia tomentosa et Bosqueiopsis gillettii), on constate qu’elles possèdent plusieurs plantules dans le sous-bois des plantations d’eucalyptus, mais très peu de celles-ci n’arrivent au stage macrophanérophytes du fait du taux de mortalité élevé. Un schéma de reconstitution forestière a été proposé à partir des observations faites de cette forêt.© 2016 International Formulae Group. All rights reserved.Mots clés: Diversité floristique, dynamique de reconstitution, forêt naturelle, plantations à Eucalyptus, BrazzavilleEnglish Title:  Floristic diversity and reconstitution dynamics of the Zoological Park Forest under eucalyptus cultivation in Brazzaville, CongoEnglish AbstractThe Zoological Park forest is a natural relic’s forest established at the center of Brazzaville’s city. This ecosystem is undergoing anthropogenic pressure due to the growing needs in wood energy, wooden crafts and plants used in herbal medicine. The more degraded areas were reforested with eucalyptus. It was found in the undergrowth of eucalyptus forests, the replenishment of natural forest. A diachronic study was made to follow this reconstruction. Plots of 600 m2 of different ages have been delineated in these plantations, in which all species of existing natural forest, DBH and the number of individuals were recorded. The results obtained show that morphological types of woody increase with age of the eucalyptus plantation while herbaceous forms decrease with increasing age. Similarly, the numbers of biological types vary with the age of the eucalyptus plantation. By following the three dominant species of this natural forest (Millettia laurentii) and Markhamia tomentosa and Bosqueiopsis gillettii, there they have several plants in the understory of eucalyptus plantations, but very few of these seedlings reach stage macrophanerophytes by virtue of the high mortality rate. A forest recovery scheme has been proposed from the observations of this forest.© 2016 International Formulae Group. All rights reserved.Keywords: Diversity floristic, dynamic of recovery, natural forest, plantations with Eucalyptus, Brazzavill

Quantification Des Stocks De Carbone De Trois Pools Clés De Carbone En Afrique Centrale : Cas De La Forêt Marécageuse De La Likouala (Nord Congo)

The data of carbon stock of central African swamps forests are very few. This study carried out an assessment of the carbon stock of living biomass and coarse woody debris of three biotopes (flooded forest, seasonal flooded forest, and terra firm forest) of Likouala swamp forest (North of Congo). The average of the carbon stock are 190.72±98.7 tC/ha, 39.69±21.24 tC/ha, and 9.45±6.6 tC/ha respectively for above ground, billow ground, and coarse woody debris. The carbon stock of our swamp forest tends to increase generally from the flooded forest to the terra firm forest. In addition, the average of the coarse woody debris carbon stock increases with the increasing of the above ground carbon stock

First estimates of fine root production in tropical peat swamp and terra firme forests of the central Congo Basin

Tropical peatlands are carbon-dense ecosystems because they accumulate partially-decomposed plant material. A substantial fraction of this organic matter may derive from fine root production (FRP). However, few FRP estimates exist for tropical peatlands, with none from the world's largest peatland complex in the central Congo Basin. Here we report on FRP using repeat photographs of roots from in situ transparent tubes (minirhizotrons), measured to 1 m depth over three one-month periods (spanning dry to wet seasons), in a palm-dominated peat swamp forest, a hardwood-dominated peat swamp forest, and a terra firme forest. We find FRP of 2.6 ± 0.3 Mg C ha-1 yr-1, 1.9 ± 0.5 Mg C ha-1 yr-1, and 1.7 ± 0.1 Mg C ha-1 yr-1 in the three ecosystem types respectively (mean ± standard error; no significant ecosystem type differences). These estimates fall within the published FRP range worldwide. Furthermore, our hardwood peat swamp estimate is similar to the only other FRP study in tropical peatlands, also hardwood-dominated, from Micronesia. We also found that FRP decreased with depth and was the highest during the dry season. Overall, we show that minirhizotrons can be used as a low-disturbance method to estimate FRP in tropical forests and peatlands

Variabilité spatiale du stock de carbone de la biomasse aérienne de la zone urbaine vers la forêt tropicale dense dans cinq localités de la république du Congo

International audienceDans le contexte mondial de réchauffement global les forêts du bassin du Congo ont un rôle majeur à jouer dans l’atténuation des changements climatiques. Une étude sur l’impact de la croissance urbaine sur le stock de carbone aérien a été conduite dans de la république du Congo. Cette étude se repose sur l’hypothèse de base suivante, les villes se sont développées sur des terres qui autrefois étaient entièrement forestière. Les objectifs de cette étude étaient de quantifier le stock de carbone dans différents types d’occupation du sol partant de la zone urbaine à la zone de forêt dense. Pour atteindre les objectifs, dans chaque localité, des parcelles d’inventaires de 25 m x 25 m avaient été installées à l’intérieur des villes, les zones dégradées péri urbaines, ainsi que dans les zones où la forêt était stable en utilisant le logiciel 10,6. L’équation de Chave et al., 2014 a été appliqué pour estimer la biomasse aérienne des arbres. Cette étude a montré que la variabilité du stock de carbone est importante de la zone urbaine vers la forêt dense avec des écarts très importants entre les types d’occupation du sol. Le stock de carbone aérien dans toutes les localités d’étude varie de 0,1 tC.ha-1 à 5,75 tC.ha-1 dans les zones urbaines, de 20 à 76 tC.ha-1 dans les jeunes forêts secondaires ainsi que dans les forêts dégradées et de 80 tC.ha-1 à 430 tC.ha-1 dans les zones de forêts non perturbées. Plusieurs causes anthropiques expliquent cette importante perte de carbone de la forêt vers les zones urbaines : l’abattage des arbres pour des raisons d’agriculture, la collecte du bois énergie, du bois en vue de la construction, l’occupation de l’espace pour des raisons d’implantations d’habitations ont été identifiées pour expliquer la conversion des terres ainsi constatées. L’étude montre que l’implantation des villes et leur extension en pleine zone forestière à des impacts important sur le stock de carbone aérien

Taking the pulse of Earth's tropical forests using networks of highly distributed plots

Tropical forests are the most diverse and productive ecosystems on Earth. While better understanding of these forests is critical for our collective future, until quite recently efforts to measure and monitor them have been largely disconnected. Networking is essential to discover the answers to questions that transcend borders and the horizons of funding agencies. Here we show how a global community is responding to the challenges of tropical ecosystem research with diverse teams measuring forests tree-by-tree in thousands of long-term plots. We review the major scientific discoveries of this work and show how this process is changing tropical forest science. Our core approach involves linking long-term grassroots initiatives with standardized protocols and data management to generate robust scaled-up results. By connecting tropical researchers and elevating their status, our Social Research Network model recognises the key role of the data originator in scientific discovery. Conceived in 1999 with RAINFOR (South America), our permanent plot networks have been adapted to Africa (AfriTRON) and Southeast Asia (T-FORCES) and widely emulated worldwide. Now these multiple initiatives are integrated via ForestPlots.net cyber-infrastructure, linking colleagues from 54 countries across 24 plot networks. Collectively these are transforming understanding of tropical forests and their biospheric role. Together we have discovered how, where and why forest carbon and biodiversity are responding to climate change, and how they feedback on it. This long-term pan-tropical collaboration has revealed a large long-term carbon sink and its trends, as well as making clear which drivers are most important, which forest processes are affected, where they are changing, what the lags are, and the likely future responses of tropical forests as the climate continues to change. By leveraging a remarkably old technology, plot networks are sparking a very modern revolution in tropical forest science. In the future, humanity can benefit greatly by nurturing the grassroots communities now collectively capable of generating unique, long-term understanding of Earth's most precious forests.Additional co-authors: Susan Laurance, William Laurance, Francoise Yoko Ishida, Andrew Marshall, Catherine Waite, Hannsjoerg Woell, Jean-Francois Bastin, Marijn Bauters, Hans Beeckman, Pfascal Boeckx, Jan Bogaert, Charles De Canniere, Thales de Haulleville, Jean-Louis Doucet, Olivier Hardy, Wannes Hubau, Elizabeth Kearsley, Hans Verbeeck, Jason Vleminckx, Steven W. Brewer, Alfredo Alarcón, Alejandro Araujo-Murakami, Eric Arets, Luzmila Arroyo, Ezequiel Chavez, Todd Fredericksen, René Guillén Villaroel, Gloria Gutierrez Sibauty, Timothy Killeen, Juan Carlos Licona, John Lleigue, Casimiro Mendoza, Samaria Murakami, Alexander Parada Gutierrez, Guido Pardo, Marielos Peña-Claros, Lourens Poorter, Marisol Toledo, Jeanneth Villalobos Cayo, Laura Jessica Viscarra, Vincent Vos, Jorge Ahumada, Everton Almeida, Jarcilene Almeida, Edmar Almeida de Oliveira, Wesley Alves da Cruz, Atila Alves de Oliveira, Fabrício Alvim Carvalho, Flávio Amorim Obermuller, Ana Andrade, Fernanda Antunes Carvalho, Simone Aparecida Vieira, Ana Carla Aquino, Luiz Aragão, Ana Claudia Araújo, Marco Antonio Assis, Jose Ataliba Mantelli Aboin Gomes, Fabrício Baccaro, Plínio Barbosa de Camargo, Paulo Barni, Jorcely Barroso, Luis Carlos Bernacci, Kauane Bordin, Marcelo Brilhante de Medeiros, Igor Broggio, José Luís Camargo, Domingos Cardoso, Maria Antonia Carniello, Andre Luis Casarin Rochelle, Carolina Castilho, Antonio Alberto Jorge Farias Castro, Wendeson Castro, Sabina Cerruto Ribeiro, Flávia Costa, Rodrigo Costa de Oliveira, Italo Coutinho, John Cunha, Lola da Costa, Lucia da Costa Ferreira, Richarlly da Costa Silva, Marta da Graça Zacarias Simbine, Vitor de Andrade Kamimura, Haroldo Cavalcante de Lima, Lia de Oliveira Melo, Luciano de Queiroz, José Romualdo de Sousa Lima, Mário do Espírito Santo, Tomas Domingues, Nayane Cristina dos Santos Prestes, Steffan Eduardo Silva Carneiro, Fernando Elias, Gabriel Eliseu, Thaise Emilio, Camila Laís Farrapo, Letícia Fernandes, Gustavo Ferreira, Joice Ferreira, Leandro Ferreira, Socorro Ferreira, Marcelo Fragomeni Simon, Maria Aparecida Freitas, Queila S. García, Angelo Gilberto Manzatto, Paulo Graça, Frederico Guilherme, Eduardo Hase, Niro Higuchi, Mariana Iguatemy, Reinaldo Imbrozio Barbosa, Margarita Jaramillo, Carlos Joly, Joice Klipel, Iêda Leão do Amaral, Carolina Levis, Antonio S. Lima, Maurício Lima Dan, Aline Lopes, Herison Madeiros, William E. Magnusson, Rubens Manoel dos Santos, Beatriz Marimon, Ben Hur Marimon Junior, Roberta Marotti Martelletti Grillo, Luiz Martinelli, Simone Matias Reis, Salomão Medeiros, Milton Meira-Junior, Thiago Metzker, Paulo Morandi, Natanael Moreira do Nascimento, Magna Moura, Sandra Cristina Müller, Laszlo Nagy, Henrique Nascimento, Marcelo Nascimento, Adriano Nogueira Lima, Raimunda Oliveira de Araújo, Jhonathan Oliveira Silva, Marcelo Pansonato, Gabriel Pavan Sabino, Karla Maria Pedra de Abreu, Pablo José Francisco Pena Rodrigues, Maria Piedade, Domingos Rodrigues, José Roberto Rodrigues Pinto, Carlos Quesada, Eliana Ramos, Rafael Ramos, Priscyla Rodrigues, Thaiane Rodrigues de Sousa, Rafael Salomão, Flávia Santana, Marcos Scaranello, Rodrigo Scarton Bergamin, Juliana Schietti, Jochen Schöngart, Gustavo Schwartz, Natalino Silva, Marcos Silveira, Cristiana Simão Seixas, Marta Simbine, Ana Claudia Souza, Priscila Souza, Rodolfo Souza, Tereza Sposito, Edson Stefani Junior, Julio Daniel do Vale, Ima Célia Guimarães Vieira, Dora Villela, Marcos Vital, Haron Xaud, Katia Zanini, Charles Eugene Zartman, Nur Khalish Hafizhah Ideris, Faizah binti Hj Metali, Kamariah Abu Salim, Muhd Shahruney Saparudin, Rafizah Mat Serudin, Rahayu Sukmaria Sukri, Serge Begne, George Chuyong, Marie Noel Djuikouo, Christelle Gonmadje, Murielle Simo-Droissart, Bonaventure Sonké, Hermann Taedoumg, Lise Zemagho, Sean Thomas, Fidèle Baya, Gustavo Saiz, Javier Silva Espejo, Dexiang Chen, Alan Hamilton, Yide Li, Tushou Luo, Shukui Niu, Han Xu, Zhang Zhou, Esteban Álvarez-Dávila, Juan Carlos Andrés Escobar, Henry Arellano-Peña, Jaime Cabezas Duarte, Jhon Calderón, Lina Maria Corrales Bravo, Borish Cuadrado, Hermes Cuadros, Alvaro Duque, Luisa Fernanda Duque, Sandra Milena Espinosa, Rebeca Franke-Ante, Hernando García, Alejandro Gómez, Roy González-M., Álvaro Idárraga-Piedrahíta, Eliana Jimenez, Rubén Jurado, Wilmar López Oviedo, René López-Camacho, Omar Aurelio Melo Cruz, Irina Mendoza Polo, Edwin Paky, Karen Pérez, Angel Pijachi, Camila Pizano, Adriana Prieto, Laura Ramos, Zorayda Restrepo Correa, James Richardson, Elkin Rodríguez, Gina M. Rodriguez M., Agustín Rudas, Pablo Stevenson, Markéta Chudomelová, Martin Dancak, Radim Hédl, Stanislav Lhota, Martin Svatek, Jacques Mukinzi, Corneille Ewango, Terese Hart, Emmanuel Kasongo Yakusu, Janvier Lisingo, Jean-Remy Makana, Faustin Mbayu, Benjamin Toirambe, John Tshibamba Mukendi, Lars Kvist, Gustav Nebel, Selene Báez, Carlos Céron, Daniel M. Griffith, Juan Ernesto Guevara Andino, David Neill, Walter Palacios, Maria Cristina Peñuela-Mora, Gonzalo Rivas-Torres, Gorky Villa, Sheleme Demissie, Tadesse Gole, Techane Gonfa, Kalle Ruokolainen, Michel Baisie, Fabrice Bénédet, Wemo Betian, Vincent Bezard, Damien Bonal, Jerôme Chave, Vincent Droissart, Sylvie Gourlet-Fleury, Annette Hladik, Nicolas Labrière, Pétrus Naisso, Maxime Réjou-Méchain, Plinio Sist, Lilian Blanc, Benoit Burban, Géraldine Derroire, Aurélie Dourdain, Clement Stahl, Natacha Nssi Bengone, Eric Chezeaux, Fidèle Evouna Ondo, Vincent Medjibe, Vianet Mihindou, Lee White, Heike Culmsee, Cristabel Durán Rangel, Viviana Horna, Florian Wittmann, Stephen Adu-Bredu, Kofi Affum-Baffoe, Ernest Foli, Michael Balinga, Anand Roopsind, James Singh, Raquel Thomas, Roderick Zagt, Indu K. Murthy, Kuswata Kartawinata, Edi Mirmanto, Hari Priyadi, Ismayadi Samsoedin, Terry Sunderland, Ishak Yassir, Francesco Rovero, Barbara Vinceti, Bruno Hérault, Shin-Ichiro Aiba, Kanehiro Kitayama, Armandu Daniels, Darlington Tuagben, John T. Woods, Muhammad Fitriadi, Alexander Karolus, Kho Lip Khoon, Noreen Majalap, Colin Maycock, Reuben Nilus, Sylvester Tan, Almeida Sitoe, Indiana Coronado G., Lucas Ojo, Rafael de Assis, Axel Dalberg Poulsen, Douglas Sheil, Karen Arévalo Pezo, Hans Buttgenbach Verde, Victor Chama Moscoso, Jimmy Cesar Cordova Oroche, Fernando Cornejo Valverde, Massiel Corrales Medina, Nallaret Davila Cardozo, Jano de Rutte Corzo, Jhon del Aguila Pasquel, Gerardo Flores Llampazo, Luis Freitas, Darcy Galiano Cabrera, Roosevelt García Villacorta, Karina Garcia Cabrera, Diego García Soria, Leticia Gatica Saboya, Julio Miguel Grandez Rios, Gabriel Hidalgo Pizango, Eurídice Honorio Coronado, Isau Huamantupa-Chuquimaco, Walter Huaraca Huasco, Yuri Tomas Huillca Aedo, Jose Luis Marcelo Peña, Abel Monteagudo Mendoza, Vanesa Moreano Rodriguez, Percy Núñez Vargas, Sonia Cesarina Palacios Ramos, Nadir Pallqui Camacho, Antonio Peña Cruz, Freddy Ramirez Arevalo, José Reyna Huaymacari, Carlos Reynel Rodriguez, Marcos Antonio Ríos Paredes, Lily Rodriguez Bayona, Rocio del Pilar Rojas Gonzales, Maria Elena Rojas Peña, Norma Salinas Revilla, Yahn Carlos Soto Shareva, Raul Tupayachi Trujillo, Luis Valenzuela Gamarra, Rodolfo Vasquez Martinez, Jim Vega Arenas, Christian Amani, Suspense Averti Ifo, Yannick Bocko, Patrick Boundja, Romeo Ekoungoulou, Mireille Hockemba, Donatien Nzala, Alusine Fofanah, David Taylor, Guillermo Bañares-de Dios, Luis Cayuela, Íñigo Granzow-de la Cerda, Manuel Macía, Juliana Stropp, Maureen Playfair, Verginia Wortel, Toby Gardner, Robert Muscarella, Hari Priyadi, Ervan Rutishauser, Kuo-Jung Chao, Pantaleo Munishi, Olaf Bánki, Frans Bongers, Rene Boot, Gabriella Fredriksson, Jan Reitsma, Hans ter Steege, Tinde van Andel, Peter van de Meer, Peter van der Hout, Mark van Nieuwstadt, Bert van Ulft, Elmar Veenendaal, Ronald Vernimmen, Pieter Zuidema, Joeri Zwerts, Perpetra Akite, Robert Bitariho, Colin Chapman, Eilu Gerald, Miguel Leal, Patrick Mucunguzi, Miguel Alexiades, Timothy R. Baker, Karina Banda, Lindsay Banin, Jos Barlow, Amy Bennett, Erika Berenguer, Nicholas Berry, Neil M. Bird, George A. Blackburn, Francis Brearley, Roel Brienen, David Burslem, Lidiany Carvalho, Percival Cho, Fernanda Coelho, Murray Collins, David Coomes, Aida Cuni-Sanchez, Greta Dargie, Kyle Dexter, Mat Disney, Freddie Draper, Muying Duan, Adriane Esquivel-Muelbert, Robert Ewers, Belen Fadrique, Sophie Fauset, Ted R. Feldpausch, Filipe França, David Galbraith, Martin Gilpin, Emanuel Gloor, John Grace, Keith Hamer, David Harris, Tommaso Jucker, Michelle Kalamandeen, Bente Klitgaard, Aurora Levesley, Simon L. Lewis, Jeremy Lindsell, Gabriela Lopez-Gonzalez, Jon Lovett, Yadvinder Malhi, Toby Marthews, Emma McIntosh, Karina Melgaço, William Milliken, Edward Mitchard, Peter Moonlight, Sam Moore, Alexandra Morel, Julie Peacock, Kelvin Peh, Colin Pendry, R. Toby Pennington, Luciana de Oliveira Pereira, Carlos Peres, Oliver L. Phillips, Georgia Pickavance, Thomas Pugh, Lan Qie, Terhi Riutta, Katherine Roucoux, Casey Ryan, Tiina Sarkinen, Camila Silva Valeria, Dominick Spracklen, Suzanne Stas, Martin Sullivan, Michael Swaine, Joey Talbot, James Taplin, Geertje van der Heijden, Laura Vedovato, Simon Willcock, Mathew Williams, Luciana Alves, Patricia Alvarez Loayza, Gabriel Arellano, Cheryl Asa, Peter Ashton, Gregory Asner, Terry Brncic, Foster Brown, Robyn Burnham, Connie Clark, James Comiskey, Gabriel Damasco, Stuart Davies, Tony Di Fiore, Terry Erwin, William Farfan-Rios, Jefferson Hall, David Kenfack, Thomas Lovejoy, Roberta Martin, Olga Martha Montiel, John Pipoly, Nigel Pitman, John Poulsen, Richard Primack, Miles Silman, Marc Steininger, Varun Swamy, John Terborgh, Duncan Thomas, Peter Umunay, Maria Uriarte, Emilio Vilanova Torre, Ophelia Wang, Kenneth Young, Gerardo A. Aymard C., Lionel Hernández, Rafael Herrera Fernández, Hirma Ramírez-Angulo, Pedro Salcedo, Elio Sanoja, Julio Serrano, Armando Torres-Lezama, Tinh Cong Le, Trai Trong Le, Hieu Dang Tra

Land use dynamics in the South West Cameroon region: between conservation and anthropic pressure

peer reviewedLe Sud-Ouest Cameroun est l’une des dix Régions qui regorge des enjeux considérables en termes de conservation de la biodiversité. Paradoxalement, elle fait aussi l’objet de plusieurs convoitises de la part des agro-industries (sol volcaniques et très fertiles). Cette situation induit une dynamique considérable de l’occupation du sol, qui se traduit dans l’ensemble par une évolution dégradante et régressive du couvert forestier. Les aires protégées se trouvent ainsi constamment menacées par cette emprise humaine. L’objectif de cette recherche est d’analyser, à partir des outils d’observation de la terre (images satellites, données GPS), la dynamique de l’occupation du sol dans la Région du Sud-Ouest entre 1987 et 2017 et son incidence sur les efforts de conservation. Cette opération permettra de visualiser l’évolution des différentes classes d’occupations dans le temps et dans l’espace. Les images Landsat sont traitées à l’aide du logiciel Erdas Imagine®, puis manipulé sous Arcgis® 10.2 pour des traitements SIG. La matrice de confusion est utilisée pour évaluer la fiabilité des classifications. Il apparait que la partie Sud de la Région (proche de l’Océan Atlantique) connait une forte dégradation, liée à la concentration des agro-industries (PAMOL, CDC,…), l’urbanisation (Tiko, Buea, Limbé…) et la croissance démographique. La forêt connait une dégradation dont le taux se situe autour de 7,62%