Soil Degradation in China by Degradation Type According to ASSOD
Assessment (in mio. hectares)
Negligible
Light
Moderate
Strong
Extreme
Water Erosion
Loss of Topsoil (Wt)
15.8
105.9
44.9
3.8
0.2
Terrain Deformation (Wd)
0.5
7.9
5.9
24.0
-
Off-site Effects (Wo)
0.2
0.2
0.2
-
-
Wind Erosion
Loss of Topsoil (Et)
1.7
65.9
2.5
+
+
Terrain Deformation (Ed)
+
7.2
5.5
57.9
-
Off-site Effects (Eo)
+
2.0
6.5
0.2
-
Chemical Deterioration
Fertility Decline (Cn)
32.4
31.7
4.8
-
-
Salinisation (Cs)
0.5
6.8
2.6
-
-
Dystrification (Ct)
-
+
-
-
-
Physical Deterioration
Aridification (Pa)
-
23.7
-
-
-
Compaction and Crusting (Pc/Pk)
-
0.5
-
-
-
Waterlogging (Pw)
3.8
-
-
-
-
Total
Degradation
All
Types
55.0
251.9
72.9
86.0
0.25
Source:
Lynden, G.W.J. / Oldeman, L.R. (1997): The assessment of the status of human-induced soil
degradation in South and Southeast Asia. United Nations Environment Program (UNEP), Food
and Agricultural Organization of the United Nations (FAO), International Soil Reference
and Information Centre (ISRIC), Wageningen, The Netherlands
Note:
(-) no significant occurrence; (+) Less than 0.1 but more than 0.01 million hectares; for
calculation of the totals we have assumed that (+) is equivalent to 0.05 million hectares.
