Soil Degradation Assessment: Extent of Stable Soils (All Types of Land)
Van Lynden, G.W.J. / Oldeman, L.R. (1997): The assessment of the status of human-induced
soil degradation in south and south-east Asia. United Nations Environment Programme
(UNEP), Food and Agricultural Organization of the United Nations (FAO), International Soil
Reference and Information Centre (ISRIC), Wageningen (digital map and data sets)
For the ASSOD
assessment it is important to distinguish the extent of soil degradation from the
intensity or degree of its impact. This map only shows the extent of
soil degradation - that is, which percentage of a particular land area is affected by soil
Only in the red areas all the land was classified as being affected by some
kind of soil degradation. This includes degradation of various intensities -
from extreme to negligible. It might well be that an area with a 100% extent of
degradation (= no stable land) is affected only at a low or negligible degree.
Most land areas in China have a lower extent of soil degradation. Usually between 40 to 60
percent of the area is affected by some kind of degradation (light green, green).
In southern, northern and north-western China one can find large areas, were soil
degradation affects less than 20% of the land (dark green).