Dynamique spatio-temporelle de l’occupation des sols des communes de Torodi, Gothèye et Tagazar de la région de Tillabéry au Niger

Le développement agricole et la forte croissance démographique ont contribué à la perte du couvert forestier ivoirien. L’objectif de cette étude est d’analyser l’évolution passée (1986 à 2019) et de prédire (2019 à 2050) l’occupation des sols dans le bassin versant de la Lobo. La classification supervisée par maximum de vraisemblance des images landsat de 1986, 2003 et 2019, couplée à la méthode intensity analysis a été appliquée dans cette étude. Les résultats montrent sur la période de 1986 à 2019 une baisse de la végétation de 4708,82 km2 à 4054,72 km2 au détriment de l’augmentation de la mosaïque des cultures et jachères de 6376,56 km2 à 6925,05 km2. Les plans d’eau et sols nus et bâtis ont également augmenté respectivement de 3,73 km2 et 101,88 km2. Par contre, les aires protégées sont restées inchangées avec une superficie de 1516,13 km2. Les changements des classes d’occupation du sol par intensity analysis ont été lent au premier intervalle de temps (1986-2019) mais s’accéléront au deuxième intervalle de temps (2019 à 2050). La mosaïque des cultures et jachères et la végétation ont connu respectivement des pertes de superficies moins intenses et plus intense, tandis que les autres classes ont gagné intensément de superficies durant le premier intervalle de temps. Pendant le deuxième intervalle de temps, seuls les plans d’eau et la mosaïque des cultures et jachères connaîtront des intensités de gains de superficies moins intenses. Il n’y a pas eu de transition des autres classes vers la végétation et la mosaïque des cultures sur toute la période d’étude (1986 à 2050). Agricultural development and high demographic growth have contributed to the loss of ivorian forest cover. The objective of this study is to analyse the past (1986 to 2019) and to predict (2019 to 2050) evolution of land use in the Lobo watershed. Supervised maximum likelihood classification of landsat images from 1986, 2003 and 2019, coupled with intensity analysis was applied in this study. The results show a decrease in vegetation from 4708.82 km2 to 4054.72 km2 over the period 1986 to 2019 at the expense of an increase in the mosaic of crops and fallow land from 6376.56 km2 to 6925.05 km2. Water bodies and bare and built-up land also increased by 3.73 km2and 101.88 km2 respectively. Protected areas, on the other hand, remained unchanged at 1516.13 km2. Changes in land use classes by using intensity of analysis were slow in the first time interval (1986-2019) but will accelerate in the second time interval (2019 to 2050). Crop and fallow mosaic and vegetation experienced less intense and more intense area losses respectively, while the other classes gained area intensively during the first time interval. During the second time interval, only water bodies and the crop-fallow mosaic will experience less intense area gains. There was no transition from the other classes to vegetation and crop mosaic over the entire study period (1986 to 2050).

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“…alors le gain de j évite i, si Rtij > Wtj, alors le gain de j cible i. L'équation (5) donne Rtij et l'équation (6)…”

Section: Dynamique De L'occupation Du Sol Par La Méthode Intensity An...unclassified

Dynamique Passée et Récente et Prévision de L’occupation du Sol: cas du Bassin Versant de la Lobo (Centre – ouest de le Côte d’Ivore)

Hermann

Blanchard

Marc

et al. 2022

ESJ

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“…However, urbanization, one of the main causes of land cover degradation [21,12,22] disrupts the proper functioning of urban ecosystems through biodiversity loss and thus leads to a decline in ecosystem services [23]. In a context of strong urban expansion, ecosystem services in urban areas may have limitations and need to be further examined [24] and updated.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Ecosystem Services Rendered to the Population by Trees in the City of Parakou in Central Benin

Zohoun¹,

Baloubi²,

Azalou-Tingbe³

et al. 2021

LARP

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The city of Parakou, like cities in developing countries, is experiencing rapid urbanization with the consequences of the destruction of the tree fabric and the progressive loss of cultural knowledge related to it. But in this city, tree species are spared or planted for several reasons. This paper aims to characterize the ecosystem services associated with these trees according to different social categories of urban dwellers. A sample of 370 inhabitants determined by Dagnelie's formula is used to collect the information. The rate of identification of the types of ecosystem services has been assessed. The analysis of covariance (ANCOVA) was used to analyze the influence of social groups on the rate of identification of services. The characterization of ecosystem services according to the different groups was done using the Correspondence Factor Analysis (CFA). A total of 30 ecosystem services grouped into 24 types in 4 categories, namely provisioning services, regulating services, cultural services and support services were identified. It emerges that the most cited services are respectively, in decreasing order, air regulation (90%), food (86%), aesthetic pleasure (40%) and medicinal virtues (36%). The socio-cultural group and the level of education strongly influence the rate of ecosystem identification. The characterization of ecosystem services by to social groups shows that the interest shown by each social group in ecosystem services depends on the benefits it derives from the tree on a daily basis. Although the population recognizes the services provided by trees, it is not actively involved in their conservation, which justifies the low density of the tree layer in the city of Parakou. This gives rise to research on the socio-economic and institutional constraints linked to the promotion of trees in the city of Parakou.

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Forecasting land use and land cover dynamics using combined remote sensing, machine learning algorithm and local perception in the Agoènyivé Plateau, Togo

Yomo

Yalo

Gnazou

et al. 2023

Remote Sensing Applications: Society and Environment

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Dynamique spatio-temporelle de l’occupation des sols des communes de Torodi, Gothèye et Tagazar de la région de Tillabéry au Niger

Cited by 5 publications

References 7 publications

Dynamique Passée et Récente et Prévision de L’occupation du Sol: cas du Bassin Versant de la Lobo (Centre – ouest de le Côte d’Ivore)

Dynamique Passée et Récente et Prévision de L’occupation du Sol: cas du Bassin Versant de la Lobo (Centre – ouest de le Côte d’Ivore)

Characterization of the Ecosystem Services Rendered to the Population by Trees in the City of Parakou in Central Benin

Forecasting land use and land cover dynamics using combined remote sensing, machine learning algorithm and local perception in the Agoènyivé Plateau, Togo

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