El presente nmero de Unasylva se centra en Africa. Gran parte de ese continente ha sido afectado por la sequa durante varios aos consecutivos y millones de personas estn hoy expuestas al hambre y la malnutricin. En muchos pases la agricultura est invadiendo terrenos forestales y zonas de escasas precipitaciones. Este hecho, unido a una explotacin desordenada de la lea, los forrajes y otros bienes y servicios bsicos que pueden obtenerse de los bosques y los rboles, ha provocado una deforestacin cada vez ms rpida.
En el articulo principal sobre la silvicultura y la seguridad alimentaria se resalta la importancia que tiene la silvicultura en el mantenimiento, mejora o rehabilitacin de la capacidad productiva de la agricultura, el rendimiento directo de alimentos vegetales y animales, y su contribucin a la satisfaccin de las necesidades de energa de los hogares para la preparacin de los alimentos. Le sigue un articulo relativo a la contaminacin del aire como amenaza para los bosques de Europa.
Reviews various approaches and techniques used in a number of sub-Saharan African countries to collect and analyze data on large-scale ecological changes with particular reference to remote sensing and monitoring techniques in resource inventory; suggests ways to build more effective data bases.
Reviews various approaches and techniques used in a number of sub-Saharan African countries to collect and analyze data on large-scale ecological changes with particular reference to remote sensing and monitoring techniques in resource inventory; suggests ways to build more effective data bases.
Freezaillah B.C. Yeom of Malaysia, drawing upon his experience as a forest-resources manager in Southeast Asia, evaluates available information and weighs both positive and negative aspects of the development of lesser-known species within the wider context of resource-management efforts. From the United States, James S. Bethel, with extensive practical forestry experience at both national and international levels, evaluates, from the standpoint of the user, the facts and the conclusions that he and other well-known experts in the field of forest-resource development have drawn from them.
Freezaillah B.C. Yeom, de Malaisie, fait appel son exprience de gestionnaire forestier en Asie du Sud-Est pour valuer les informations disponibles sur les essences secondaires et peser le pour et le contre de leur emploi plus large dans le cadre gnral de l'amnagement des ressources. James S. Bethel, des Etats-Unis, qui a une vaste exprience de la sylviculture tant dans son pays que sur le plan international, expose ses propres observations et conclusions, ainsi que celles d'autres experts de renom, relatives la mise en valeur des ressources forestires.
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.