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Farmers' contributions to the conservation of tree diversity in the Groundnut Basin,Senegal

Journal of Forestry Research 2017年第5期28卷 1083-1096页

作者： Antoine sambou bienvenu sambou Anders R?bild Department of Geosciences and Natural Resource Management Faculty of ScienceUniversity of Copenhagen Institut des Sciences de l'Environnement (ISE) Facultdes Sciences et TechniqueUniversitCheikh Anta Diop(UCAD)

Tree diversity in West Africa is threatened by intensified land uses and salinization, and farmers’ role in conservation of tree species is unclear. We hypothesized that farmers contribute to conservation of tree diversity through protection of trees in their agroforestry landscapes and compared the diversity and structure of the tree vegetation across landscape classes. Inventories were carried out in three villages in the Groundnut Basin in Senegal, assessing tree diversity, density and crown cover. Tree diversity as assessed by species accumulation curves was high in forests, but cultivated landscapes had comparable or almost comparable diversity, especially in the cases where the forest was planted or was affected by charcoal production. However, the occurrence of exotic species was higher in cultivated parts of the landscape, and although many species were in common, ordination plots indicated that forests and cultivated landscapes to some degree had different species composition. Salinity had a strong influence on vegetation, not only in the tans (salt marshes) but also across the other landscape classes. In conclusion, agroforestry landscapes in the three villages harbor considerable tree diversity, but insufficient to fully conserve the tree species. We argue that informing and including farmers in tree management in the region will contribute to overall conservation of tree genetic resources.

关键词： Tree diversity Conservation-landscape classes Environmental factors Groundnut Basin

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Assessment of Climate Trends and Land Cover/Use Dynamics within the Somone River Basin, Senegal

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American Journal of Climate Change 2017年第3期6卷 513-538页

作者： Ndeye Yacine Barry Vieux Boukhaly Traore Mamadou Lamine Ndiaye Osemwegie Isimemen Hauhouot Celestin bienvenu sambou West African Science Service Center on Climate Change and Adapted Land Use (WASCAL) Felix Houphouet-Boigny University Abidjan C&ocirc te d’Ivoire Institut des Sciences de l’Environnement Faculté des Sciences et Techniques Université Cheikh Anta Diop de Dakar Dakar Sénégal Laboratoire d’Hydraulique et Mécanique des Fluides Université Cheikh Anta Diop de Dakar Dakar Sénégal Laboratoire d’Enseignement et de Recherche en Géomatique Campus universitaire de l’Ecole Supérieure Polytechnique de Dakar Dakar Sénégal

This study was undertaken mainly to 1) investigate temporal trends in annual rainfall and temperature;2) identify discontinuities in the time series;and 3) assess the Land Use/Land Cover Change (LULC) in the Somone coastal lagoon, within the river basin. The study examined temporal trends in rainfall (1931-2016) and temperature (1961-2016) datasets of Somone river basin, and breaks in time series using Mann-Kendall non-parametric test and other suitable statistical tools. Temporal evolution in LULC was assessed for the years 1954, 1978, 2003 and 2016. Analysis indicates a significant decreasing trend in precipitation over the basin. These trends are much more pronounced for minimum and average rainfall than for maximum and annual amplitudes. Contrary to precipitation, surface air temperature shows a significant increasing trend for its minimum and averages, and a decreasing trend for its maximum and amplitudes. A significant break in precipitation was observed in 1958, while surface air temperature presents much longer breaks within the years 1975 and 1977, and 1991 and 1993. A more direct implication of climate change on LULC patterns is increased in unproductive salt pans (Sabkhas). Increase in Sabkhas gave rise to conversion of forest lands to agricultural lands of local farmers in search for fertile soils to cater for the food needs of a growing population. Otherwise, the development of the settlements, favored by the tourism activity and agriculture crisis, is another cause of croplands decreasing. The findings of the present research clearly indicate that the impacts of climate change are exacerbated by rapid urbanization in the basin.

关键词： Temperature Rainfall Climatic Change Water Resources LULC Patterns Somone Coastal Lagoon

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