World atlas of thematic maps of desertification
Citations
353 citations
Cites background from "World atlas of thematic maps of des..."
...The World Atlas of Desertification (UNEP, 1992) defines arid regions as the areas where the ratio of mean annual rainfall (R) to mean annual potential evapotranspiration (PET) varies between 0....
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...Desertification in this area is highly relevant, since 41% of the area in Bolivia was subject to this phenomena (MDSMA, 1996, cited by Andressen et al., 2000)....
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...The World Atlas of Desertification (UNEP, 1992) defines arid regions as the areas where the ratio of mean annual rainfall (R) to mean annual potential evapotranspiration (PET) varies between 0.05 and 0.20 and the semi-arid regions as those where the ratio ranges between 0.2 to 0.5....
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...In an assessment of population levels in the world's drylands, the Office to Combat Desertification and Drought (UNSO) of the United Nations Development Programme (UNDP) showed that the arid and semi-arid regions account for approximately 30% of the world total area and are inhabited by 1.10 billion people or approximately 20% of the total world population....
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156 citations
Cites background from "World atlas of thematic maps of des..."
...39 (UNEP, 1992) A new paradigm of dryland development...
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155 citations
Cites methods from "World atlas of thematic maps of des..."
...Only where there apprs to be clear evidence of a data bias in the GLASOD survey have its results been modified from other sources to obtain best estimates as used in the present study....
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...For reason of cartographic necessity, the GLASOD World Map shows only the dominant form of degradation (as severity times extent) as coloured mapped areas, with the secondary form shown in the map symbol....
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...The GLASOD assessment (as it will be called) includes all the types of land degradation covered in the present study, somewhat differently subdivided but in ways that are compatible with the classification adopted here....
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...Next file Global assessment of soil degradation (GLASOD) Other sources of data Variations in data and the need for definition of degrees of severity Global assessment of soil degradation (GLASOD) Under an international project, Global assessment of soil degradation (GLASOD), an attempt has been made for the first time to map the severity of degradation on a world scale, as the World map of the satue of human-induced soil degradation (Oldeman et al., 1990)....
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...Extensive use was made of a recent comprehensive and primary study, t he Global assessment of land degradation (GLASOD) ( ldeman et al., 1990; UNEP, 1992a)....
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155 citations
145 citations
Cites background from "World atlas of thematic maps of des..."
...This index denotes the degree of aridity, ranging from hyper-arid to wet with increasing index scores (UNEP 1997)....
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References
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