Mapa mundial de la desertificacion a escala de 1:25 000 000
1977
The explanatory note gives definitions and explains degrees of desertification hazard. Criteria are given for the different bioclimates, distinguished on the accompanying maps. Four classes of vulnerability to desertification are considered: areas of sand movement, areas subject to stripping by deflation and/or sheetwash, areas subject to accelerated gully erosion, and areas subject to progressive salinization/alkalinization. Population and animal densities have been used as a measure of human and animal pressure on the land
Afficher plus [+] Moins [-]critical limits for arid zones were taken: 7 persons per sq. km and 1 bovine unit per 5 ha
Afficher plus [+] Moins [-]for semi-arid zones: 20 persons per sq. km and 1 bovine unit per 5 ha. A table summarizes the areas concerned by desertification hazards per continent.
Afficher plus [+] Moins [-]Mots clés AGROVOC
Informations bibliographiques
Cette notice bibliographique a été fournie par Food and Agriculture Organization of the United Nations
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