land improvement

Los tcnicos forestales y los administradores de recursos naturales entendieron muy poco y mal los mltiples usos que los campesinos hicieron de las formaciones forestales en el curso de los milenios, ampliamente documentados en un artculo sobre las tcnicas de ordenacin de tierras arboladas aparecido en el nmero 160 de Unasylva.

Para que produzcan los resultados apetecidos, las actividades de ordenacin de cuencas hidrogrficas han de incorporar hidrologa forestal, conservacin de suelos y aguas y planificacin del uso de la tierra en un marco lgico ms amplio que tome en consideracin no slo los fenmenos fsicos, sino tambin los factores econmicos, sociales e institucionales.

Extensive grazing is the predominant form of land use on at least a quarter of the world’s land surface, in which livestock are raised on food that comes mainly from rangelands. Extensive grazing differs from crop or forestry production, in which the produce remains in situ whilst growing.

Ainsi, pour parvenir aux rsultats souhaits, les activits d'amnagement des bassins versants doivent intgrer l'hydrologie forestire, la conservation des sols et des eaux et la planification de l'utilisation des terres dans un cadre logique plus vaste, qui tienne compte non seulement des interactions concrtes mais aussi des facteurs conomiques, sociaux et institutionnels.

To produce the desired results, therefore, watershed management efforts must incorporate "forest hydrology", "soil and water conservation" and "land use planning" into a broader, logical framework that takes into consideration not only physical interrelationships but economic, social and institutional factors as well. In this issue, Unasylva examines several facets of watershed management.

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.

An international journal of forestry and forest industries

Revista internacional de silvicultura e industrias forestales

Afscheid prof. Hellinga

Een verzameling artikelen, gepubliceerd ter gelegenheid van het 25 jarig bestaan van het ILRI te Wageningen.

Revista internacional de silvicultura e industrias forestales

Revue internationale des forts et des industries forestires