Vulnérabilité des terres des écosystèmes du domaine soudanien au Bénin de 1995 à 2015

Ahononga, Fiacre Codjo; Gouwakinnou, Gérard Nounagnon; Biaou, Samadori Sorotori Honoré; Biaou, Séverin

doi:10.19182/bft2020.346.a36295

Cited by 12 publications

(9 citation statements)

References 27 publications

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“…The rate of change (Tv) used by Ahononga et al (2020) was used to assess the evolution of land cover units.…”

Section: Land Use Change In Uvira Between 1995 and 2021mentioning

confidence: 99%

Urban anthropization: community vulnerability and resilience to flood hazards in eastern Democratic Republic of Congo

Mugisho,

Swedi,

Enock

et al. 2024

Environ. Res. Commun.

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The effects of the 2020 floods in Uvira were exacerbated by urban anthropization and climate change. Floods are causing severe human, material, economic, and environmental losses as well as affecting socioeconomic and ecological systems beyond the affected community's ability. The purpose of this study was to analyze land use changes in Uvira from 1995 to 2021 and to assess the vulnerability and effectiveness of the community's resilience strategies in response to both the impact of flooding and the risk of future flooding. This study used a mixed approach that combined the spatial analysis of land use and land change with the anthropization of community perceptions of vulnerability and flood mitigation measures. Spatial analysis revealed that anthropogenic land use increased by 4.73% per year between 1995 and 2021. In comparison to the initial surface covered in 1995, this has increased the surface occupied by human activities by 127.7%. Gender, education, and pre-flood professional activity of the household head, combined with pre-flood house construction quality, property ownership, degree of house damage, and family member death, explained households' resettlement capacity. The Mann-Whitney U test results revealed that households' vulnerability and resilience to 2020 floods were influenced by their residence municipality (Kanvinvira and Mulongwe) and lifestyle (living in the host site or reintegrating into the community). During and after floods, disaster victims received assistance from the government and stakeholders (churches, civil society, and non-governmental organizations) to mitigate flood effects, but they were unable to restore the lives of hundreds of flood victims. The study's findings suggest that provincial and local disaster management authorities, as well as stakeholders, should invest in preventive and sustainable flood risk management. Public awareness of flood prevention and mitigation should be increased through capacity-building training, preparedness, and sensitization. Finally, effective adaptation practices are required to reduce future potential damage.

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“…The rate of change (Tv) used by Ahononga et al (2020) was used to assess the evolution of land cover units.…”

Section: Land Use Change In Uvira Between 1995 and 2021mentioning

confidence: 99%

Urban anthropization: community vulnerability and resilience to flood hazards in eastern Democratic Republic of Congo

Mugisho,

Swedi,

Enock

et al. 2024

Environ. Res. Commun.

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“…The primary objective of these corrections was to eliminate any undesired noise and artifacts present in the images, thereby substantially enhancing their visual clarity and information quality. Furthermore, these meticulous corrections primed the images for subsequent supervised classification [42][43][44]. Following the pre-processing phase, a series of operations encompassing image extraction and mosaicking were employed to generate consolidated and spatially consistent image datasets.…”

Section: Land Cover Classification and Assessment Of The Changesmentioning

confidence: 99%

“…The classification of the satellite images was executed by categorizing them into nine distinct land cover classes, namely agriculture, woodland, dense forest, gallery forest, settlements, waterbodies, savannah, baresoil, and rocky terrain. Typically, satellite image classification relies on a fusion of remotely sensed data with ground-based reference data or aerial photographs captured in close temporal proximity to the satellite pass [42,43]. However, in the context of Benin, the availability of such reference data was limited, necessitating the utilization of very high-resolution imagery sourced from various platforms within Google Earth [47] as the reference dataset for our classification efforts.…”

Section: Land Cover Classification and Assessment Of The Changesmentioning

confidence: 99%

Climate and Land Use/Land Cover Changes within the Sota Catchment (Benin, West Africa)

Sambieni,

Hountondji,

Sintondji

et al. 2024

Hydrology

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Climate and land cover changes are key factors in river basins’ management. This study investigates on the one hand 60-year (1960 to 2019) rainfall and temperature variability using station data combined with gridded data, and on the other hand land cover changes for the years 1990, 2005, and 2020 in the Sota catchment (13,410 km2, North Benin, West Africa). The climate period is different from the chosen land use change period due to the unavailability of satellite images. Standardized anomaly index, break points, trend analysis, and Thiessen’s polygon were applied. Satellite images were processed and ground truthing was carried out to assess land cover changes. The analyses revealed a wet period from 1960 to 1972, a dry period from 1973 to 1987, and another wet period from 1988 to 2019. The annual rainfall decreases from the south to the north of the catchment. In addition, rainfall showed a non-significant trend over the study period, and no significant changes were identified between the two normals (1960–1989 and 1990–2019) at catchment scale, although some individual stations exhibited significant trends. Temperatures, in contrast, showed a significant increasing trend over the study period at catchment scale, with significant break points in 1978, 1990, and 2004 for Tmax, and 1989 for Tmin. An increase of 0.4 °C and 1.2 °C is noted, respectively, for Tmax and Tmin between the two normals. The study also revealed increases in agricultural areas (212.1%), settlements (76.6%), waterbodies (2.9%), and baresoil (52%) against decreases in woodland (49.6%), dense forest (42.2%), gallery forest (21.2%), and savanna (31.9%) from 1990 to 2020. These changes in climate and land cover will have implications for the region. Appropriate adaptation measures, including Integrated Water Resources Management and afforestation, are required.

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“…Par exemple, la fréquence de prélèvement des individus matures et l'émondage régulier des pieds du samba lors des rituels du culte Orisha Oro peuvent exacerber la fragmentation de ses populations, empêcher sa régénération naturelle et conduire à terme à son extirpation des forêts vouées à sa préservation. L'effet de l'exploitation sur la structure et la stabilité des populations de plantes importantes a été mis en évidence (Gaoué et Ticktin, 2007 ;Assogba et al, 2020 ;Ahononga et al, 2020). La conséquence écologique la plus directe de l'extraction des organes d'une espèce est l'altération des taux de survie, de croissance et de reproduction des individus de l'espèce (Gaoué et Ticktin, 2007).…”

Section: Introductionunclassified

Impacts des tabous et des cérémonies rituelles sur la structure des peuplements de Triplochiton scleroxylon K. Schum., un arbre sacré au Bénin

GANKA,

SALAKO,

FANDOHAN

2023

Bois for. trop.

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Triplochiton scleroxylon (samba ou ayous ou abachi ou obeche ou wawa) est une espèce culturelle clé du culte Orisha Oro au Bénin, dont les populations naturelles sont en déclin. Les informations sur les schémas spatiaux des arbres de cette espèce sont quasiment non documentées, ce qui limite la mise en œuvre d’une restauration écologique de ses populations. Cette étude vise à évaluer les modèles démographiques et spatiaux actuels de T. scleroxylon en fonction des tabous relatifs à l’espèce et de la fréquence des cérémonies rituelles du culte au Bénin. Des inventaires et une cartographie des pieds de l’espèce dans 12 placeaux de 100 m × 100 m ont été réalisés. L’étude a comparé la densité et la hauteur totale des arbres, leur distribution selon les classes de diamètre et les schémas spatiaux suivant les formations soumises à différentes proportions de tabous et fréquences de cérémonies rituelles. Les résultats ont montré, d’une part, que le nombre des tabous a un effet positif et, d’autre part, que la fréquence des cérémonies rituelles du culte a un effet négatif sur les peuplements à T. scleroxylon. Les densités de tiges juvéniles et adultes étaient respectivement trois et deux fois supérieures dans les forêts soumises à un plus grand nombre de tabous et un faible nombre de cérémonies rituelles. La distribution des arbres en classes de diamètre présente des tendances similaires. Cependant, l’analyse de la structure spatiale des arbres indique globalement une distribution aléatoire et une indépendance des juvéniles par rapport aux adultes. Compte tenu des rituels liés à T. scleroxylon en raison de sa position d’espèce centrale lors des cérémonies du culte Orisha Oro, sa sacralisation ne peut pas garantir sa conservation. L’utilisation durable et la conservation de T. scleroxylon nécessitent une sensibilisation des dignitaires des forêts sacrées à la réduction des fréquences des cérémonies rituelles, à la préservation stricte des grands semenciers, et à l’enrichissement des forêts sacrées et la promotion des plantations de l’espèce.

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Vulnérabilité des terres des écosystèmes du domaine soudanien au Bénin de 1995 à 2015

Cited by 12 publications

References 27 publications

Urban anthropization: community vulnerability and resilience to flood hazards in eastern Democratic Republic of Congo

Urban anthropization: community vulnerability and resilience to flood hazards in eastern Democratic Republic of Congo

Climate and Land Use/Land Cover Changes within the Sota Catchment (Benin, West Africa)

Impacts des tabous et des cérémonies rituelles sur la structure des peuplements de Triplochiton scleroxylon K. Schum., un arbre sacré au Bénin

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