http://197.159.135.214/jspui/handle/123456789/29 2026-04-23T15:08:17Z 2026-04-23T15:08:17Z Taonda, Adama Zerbo, Issouf N’Guessan, Anny Estelle Charles, Innocent Traore, Emmanuel Kassi, Justin N.’Dja Thiombiano, Adjima http://197.159.135.214/jspui/handle/123456789/1150 2026-04-21T15:06:52Z 2024-03-18T00:00:00Z

Effects of land use and climate on the diversity and population structure in natural stands of Detarium microcarpum Guill. & Perr. (Fabaceae) in Burkina Faso (West Africa) Taonda, Adama; Zerbo, Issouf; N’Guessan, Anny Estelle; Charles, Innocent; Traore, Emmanuel; Kassi, Justin N.’Dja; Thiombiano, Adjima Detarium microcarpum Guill. & Perr. is a multipurpose species, providing many ecosystem services. However, in its geographical range, its multiple uses represent a major challenge to the sustainable management and conservation of its resources. This study aimed to determine the effect of climatic zones, land uses, and their interaction on the natural stands of D. microcarpum. Inventories were conducted in 165 plots in two climatic zones and land use types in Burkina Faso. Hill diversity indices were used to determine the effects of climatic zones, land uses, and their interaction on D. microcarpum stand diversity. Generalized linear models were used to assess the effect of the abiotic and biotic factors on the species’ structural parameters. Land uses and climatic zones significantly affected D. microcarpum stand diversity and structure. The lowest stand diversity was recorded in the unprotected areas. The similarity in woody species composition between land uses and climatic zones was low, indicating high beta diversity. The generalized linear model showed that rainfall, temperature, habitat heterospecific density, and habitatspecific richness significantly influenced the structural parameters of the D. microcarpum population. The diameter classes’ distribution revealed unstable populations for the adult stratum, independent of climatic zones and land use types, except for the protected area in the Sudanian zone. The height class distribution of the juvenile stratum highlighted the instability regeneration of D. microcarpum populations. This study highlighted the instability of D. microcarpum populations and the specific effects of biotic and abiotic variables on the species’ structural parameters. Thus, the findings suggest urgent conservation measures to ensure sustainable utilisation and management of the species. A Publication submitted to the West African Science Service Centre on Climate Change and Adapted Land Use and the Kwame Nkrumah University of Science and Technology, Kumasi, Ghana, in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Climate Change and Land Use

2024-03-18T00:00:00Z Bah, Omar Ali Kone, Tidiani Yaffa, Sidat Ndiaye, Mamadou Lamine http://197.159.135.214/jspui/handle/123456789/432 2022-11-15T01:45:29Z 2019-06-01T00:00:00Z

Land Use and Land Cover Dynamics in Central River Region of the Gambia, West Africa from 1984 to 2017 Bah, Omar Ali; Kone, Tidiani; Yaffa, Sidat; Ndiaye, Mamadou Lamine This study is focused on land use and land cover dynamics observed in Central River Region. It aims to determine the direction and rate of change in land use as a means of assessing the impact of climate change in Central River Region (CRR) of The Gambia. Decadal satellite images were used to measure changes in land use and land cover from 1984 to 2017 using supervised classification. Eight land use and land cover types were identified and mapped in this study namely: Crop lands, Gambia River, Halophytic vegetation, Irrigated crops, Mangrove, Settlement, Shrub/Wood savanna and Wooded savanna. The areas of crop lands, halophytic vegetation and settlement expanded between 1984 and 2017. River Gambia, irrigated crops, mangrove, shrub/wood savanna and wooded savanna areas decreased during the same period. Transition to less savanna was higher than transition to more settlement. In addition, physicochemical parameters were analyzed during the rainy and dry seasons for correlation with climate data. Socioeconomic surveys based on structured questionnaires were also conducted with 70 households in 6 villages in CRR. Land clearing for agriculture, tree cutting for firewood and charcoal, settlement and livestock grazing were mainly cited by the respondents as the main culprit inducing land cover change in CRR. This study shows that deforestation and forest degradation are still in progress despite the implementation of a management plan for a full rotation. We therefore proposed best management practices in order to control the agricultural clearing of land in the region such as agricultural intensification and soil fertility improvement. Research Article

2019-06-01T00:00:00Z Hounkpèvi, Achille Tosso, Félicien Gbèmavo, Dossou Sèblodo Judes Charlemagne Kouassi, Edouard Konan Koné, Daouda Kakaï, Romain Glèlè http://197.159.135.214/jspui/handle/123456789/431 2022-11-15T01:43:45Z 2016-04-01T00:00:00Z

Climate and potential habitat suitability for cultivation and in situ conservation of the black plum (Vitex doniana Sweet) in Benin, West Africa Hounkpèvi, Achille; Tosso, Félicien; Gbèmavo, Dossou Sèblodo Judes Charlemagne; Kouassi, Edouard Konan; Koné, Daouda; Kakaï, Romain Glèlè Sustainable management actions are needed for several indigenous agro forestry plant species like the black plum (Vitex doniana Sweet) because they are facing increasing pressures due to the rapid human growth and threats such as climate change. By combining species distribution modelling using the Maximum Entropy Algorithm (Max Ent) and representation gap analysis, this study accessed the impacts of current and future (2050) climates on the potential distribution of Vitex doniana in Benin with insight on the protected areas network (PAN). The model showed a high goodness-of-fit (AUC = 0.92 ± 0.02) and a very good predictive power (TSS = 0.72 ± 0.01). Our findings indicated annual mean rainfall, annual mean diurnal range of temperature and mean temperature of the driest quarter as the most important predictors driving the distribution of V. doniana. Under current climate, about 85 % of Benin area is potentially suitable for its cultivation. This potential suitable area is projected to increase by 3 to 12 % under future climatic conditions. A large proportion (76.28 %) of the national PAN was reported as potentially suitable for the conservation of the species under current climate with increase projections of 14 to 23 % under future climate. The study showed that V. doniana can be cultivated in several areas of Benin and that the PAN is potentially suitable for its conservation. These findings highlighted some of the opportunities of integrating V. doniana in the formal production systems of Benin and also its potentialities in ecosystems restoration under the changing climate. Research Article

2016-04-01T00:00:00Z Barry, Ndéye Yacine Ndiaye, Mamadou Lamine Hauhouot, Celestin Sambou, Bienvenu http://197.159.135.214/jspui/handle/123456789/430 2023-01-16T10:09:18Z 2019-01-01T00:00:00Z

Using Remote Sensing Technics for Land Use Land Cover Changes Analyses from 1950s to 2000s in Somone Tropical Coastal Lagoon, Senegal Barry, Ndéye Yacine; Ndiaye, Mamadou Lamine; Hauhouot, Celestin; Sambou, Bienvenu In many developing countries, some natural areas are faced with gaps in appropriate map coverage mainly on land use and land cover (LULC) changes. This situation makes it difficult to plan and implement natural environmental protection and natural resource management programs. Remote sensing and geographic information systems (GIS) are excellent tools for mapping LULC changes. This study investigated LULC changes in ‘Somone’ coastal lagoon in Senegal using multisource remote sensed data. Data sets included aerial photographs recorded in March 1954, and February 1978, as well as satellite images recorded in February 2003 and April 2016. All images were geometrically corrected and segmented. Photos and/or images interpretations were made with the aid of computer and post-classification change detection technique was applied to classify multisource data and to map changes. Stratified sampling was used to assess all classification results. The accuracies of image classifications averaged 65% (1954), 62% (1978), 79% (2003) and 88% (2016). The postclassification analysis resulted in the largest overall accuracy of 66, 72.7, 72.4 and 80.6% for the 1954–1978, 1978-2003 and 2003–2016 image pairs, respectively. Results indicated an increase in Settlements, from 0.29% in 1954 to 9.21% in 2016, the expansion of the Sabkha, from 5.29% in 1954 to 18.48% in 2016. The mangrove forest has experimented a reduction between 1954 and 1978 (from 4.07% to 0.56%) and a regeneration (linked to the protection and preservation policies within the protected area) from the year 2003 to 2016 (from 1.44% to 2.65%). However, the forest areas were greatly reduced (from 51.06% in 1954 to 10.86% in 2016) and replaced by Settlements (urbanization) as well as Croplands. Research Article

2019-01-01T00:00:00Z