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Mostrando ítems 1 a 9 de 19.
  1. Library Resource
    Artículos de revistas y libros
    Diciembre, 2011
    Sierra Leona

    This paper presents findings of a land-use and land-cover (LULC) change mapping exercise conducted in Freetown, Sierra Leone. Nine LULC classes were mapped from multi-temporal Landsat data of 1974, 1986 and 2000. Special attention was given to the growth or otherwise of agricultural land in relation to other LULC classes. Conversion of one land-use/-cover type to the other was identified, and its effects discussed. Major conversions occurred between agricultural lands, grasslands, evergreen forest, built-up areas and barren land.

  2. Library Resource
    Artículos de revistas y libros
    Diciembre, 2013
    Sierra Leona, Global

    Global changes in climate today present hostile weather conditions which pose considerable threats to the rich and poor alike. The capacity for developing countries to cope with these impacts is weak and a development concern. The post-conflict West African nation of Sierra Leone is no exception. In fact, rural areas are exposed to high degrees of vulnerability, livelihood insecurity and hostile environments. This paper explores the experiences of rural people and identifies impacts and coping mechanisms used in response to these changes.

  3. Library Resource
    Artículos de revistas y libros
    Marzo, 2016
    Camerún, Sierra Leona, África, África occidental

    The West African cocoa belt, reaching from Sierra Leone to southern Cameroon, is the origin of about 70% of the world's cocoa (Theobroma cacao), which in turn is the basis of the livelihoods of about two million farmers. We analyze cocoa's vulnerability to climate change in the West African cocoa belt, based on climate projections for the 2050s of 19 Global Circulation Models under the Intergovernmental Panel on Climate Change intermediate emissions scenario RCP 6.0.

  4. Library Resource
    Artículos de revistas y libros
    Diciembre, 1995
    Angola, Burkina Faso, Estados Unidos de América, Mozambique, Burundi, Francia, Ghana, Congo, Djibouti, Sierra Leona, Níger, Rwanda, Liberia, Togo, Botswana, India, Senegal, Gabón, Kenya
  5. Library Resource
    Artículos de revistas y libros
    Diciembre, 1984
    Kenya, Francia, Nigeria, Filipinas, Micronesia, Australia, Ghana, Congo, Guinea, India, Sierra Leona, Etiopía, Níger, Brasil

    Shifting cultivation, under its diverse forms of slash and burn system, is a traditional method of cultivating tropical upland soils, mostly for subsistence purposes. This traditional system of cultivation is in ecological balance with the environment and does not irreversibly degrade the soil resource, provided a sufficient length of fallow is allowed for soil restoration. However, increasing population pressures necessitate more intensive use of land. The consequence is extended cropping periods and shortened fallows.

  6. Library Resource
    Artículos de revistas y libros
    Diciembre, 1984
    Argelia, Egipto, Liberia, Estados Unidos de América, Alemania, Marruecos, Côte d'Ivoire, Guinea, Sierra Leona, África

    This paper is written in fulfilment of the requirement of the Associate Regional Advisers (ARA) Programme which is run under the auspices of the Forest Industries Advisory Group (FIAG) for Africa. The objective of the Forest Industries Advisory Group is to assist African countries in promoting the growth of forest industries and their optimum contribution to economic and social development.

  7. Library Resource
    Artículos de revistas y libros
    Diciembre, 1980
    Benin, Nigeria, Zambia, Malí, Ghana, Congo, Sierra Leona, Níger, Colombia, Kenya, Liberia, Japón, Camerún, Chad, Senegal, Sudán, Togo, Côte d'Ivoire, África

    Policy makers as well as scientists have started to acquire an honest appreciation of the possibilities of reducing the wastage of materials which could be profitably utilized for improving or maintaining soil productivity. In addition, the great opportunities offered by making more efficient use of the potentials of biological nitrogen fixation in farming systems are now fully recognized. A number of recommendations and suggested guidelines were made by the various Working Groups during the two-week Workshop.

  8. Library Resource
    Artículos de revistas y libros
    Diciembre, 1998
    Liberia, Benin, Ghana, Sierra Leona, Esuatini, África

    La mayor parte de los nmeros de Unasylva se centran en un tema concreto. El objetivo de esa orientacin temtica es examinar de forma pormenorizada un aspecto determinado de las actividades y el desarrollo forestales, con el fin de resaltar su significado e importancia dentro de los confines ms amplios de nuestro universo. Sin pretender que los diferentes nmeros sean como un manual de una materia concreta, se propone presentar una serie de anlisis de cuestiones especficas que contribuyan a suscitar inters y a concienciar al lector.

  9. Library Resource
    Artículos de revistas y libros
    Diciembre, 2003
    Angola, Burkina Faso, Mozambique, Ghana, Malí, Burundi, Zimbabwe, Esuatini, Canadá, Congo, Djibouti, Sierra Leona, Malawi, Níger, Rwanda, Lesotho, Madagascar, Togo, Botswana, Gabón, Kenya, África
  10. Library Resource
    Artículos de revistas y libros
    Diciembre, 2016
    Francia, Honduras, Estados Unidos de América, Zambia, Tonga, Ghana, Congo, Sierra Leona, Malawi, Costa Rica, Níger, Palau, Kiribati, Madagascar, Luxemburgo, Países Bajos, Brasil, Canadá

    La publication de ce numéro d’Unasylva coïncide avec deux événements marquants pour les forêts. Les 196 Parties à la Convention-cadre des Nations Unies sur les changements climatiques viennent de se réunir à la Conférence Paris climat 2015 en vue de négocier un accord qui soit en mesure de changer la donne en matière de changement climatique. Toujours à Paris, le Global Landscapes Forum 2015, Forum mondial sur les paysages, a été le théâtre de discussions de haut niveau portant sur la recherche et les politiques qui sous-tendent les questions d’utilisation des terres.

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