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The Food and Agriculture Organization of the United Nations leads international efforts to defeat hunger. Serving both developed and developing countries, FAO acts as a neutral forum where all nations meet as equals to negotiate agreements and debate policy. FAO is also a source of knowledge and information. We help developing countries and countries in transition modernize and improve agriculture, forestry and fisheries practices and ensure good nutrition for all. Since our founding in 1945, we have focused special attention on developing rural areas, home to 70 percent of the world's poor and hungry people.
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Displaying 4611 - 4615 of 5073Los bosques y el medio ambiente
Paralelamente a la creciente preocupacin por el ambiente, se ha manifestado una gran inquietud por el porvenir de los recursos forestales mundiales. As lo demuestra fehacientemente la adhesin de ms de 70 pases en desarrollo a los principios del Plan de Accin Forestal en los Trpicos. En este nmero, Unasylva examina varios aspectos de la relacin del bosque con el medio ambiente. Uno de los temas ms animadamente debatidos es el de la perspectiva de que cambie el clima en todo el mundo. K.
First Meeting of the West African Sub Committee on Soil Correlation For Soil Evaluation and Management
Principles of hydraulic management of coastal lagoons for aquaculture and fisheries
This document is prepared for fisheries biologists, managers and administrators concerned with lagoon fisheries and aquaculture. Our main objective is to draw attention to the need for greater understanding of relationships between the hydraulics and productivity of lagoon fish and shellfish. The fishery yields from lagoons vary widely, and, probably, predictably, once such relationships are understood. Furthermore, the productivities of many lagoons could probably be enhanced by hydraulic manipulations, but the hydraulic manipulation is presently risky, except in dystrophic lagoons.
Fire!
Depending on land management objectives, plus a host of environmental variables, fire will sometimes be an enemy, at other times a friend; in nearly all cases, however, it will continue to exert a powerful influence on natural resource ecosystems. This being so, consideration of the potential impact (both positive and negative) of fire is essential in all land-use plans and programmes for forestry development.
¡Fuego!
El fuego es a veces enemigo, a voces amigo, segn el uso a que se destine la tierra y segn el valor que asuman unas cuantas variables ambientales; en cualquier caso, siempre repercute en los ecosistemas de recursos naturales. Es esencial, por consiguiente, tener en cuenta su efecto probable (tanto positivo, como negativo) al formular planes y programas de desarrollo forestal.