Global Extent Of Soil Degradation By Erosion

The total land area subjected to human-induced soil degradation is estimated at about 2 billion ha (Table 2; Lal, 2001). Of this, the land area affected by soil degradation due to erosion is estimated at 1100 Mha by water erosion and 550 Mha by wind erosion (Table 2). South Asia is one of the regions in the world where soil erosion by water and wind is a severe problem (Venkateswarulu, 1994 and Singh et al., 1992) (Table 3).

Table 2. Global extent of human-induced soil degradation (Lal, 2001)

World Regions

Total Land Area (10 ha)

Human induced soil degradation (10 ha)

Soil erosion ( lO ha)

Water

Wind

Africa

2966

494

227

186

Asia

4256

748

44l

222

South America

1768

243

123

42

Central America

306

63

46

5

North America

1885

95

60

35

Europe

950

219

114

42

Oceania

882

103

83

16

World Total

13013

1965

lO94

548

Table 3. Land area affected by soil erosion by water and wind in South Asia (Lal, 2001)

Country

Water erosion (Mha)

Wind erosion (Mha)

Total land area (Mha)

Afghanistan

11.2

2.1

65.3

Bangladesh

1.5

0

14.4

Bhutan

0.04

0

4.7

India

32.8

10.8

328.8

Iran

26.4

35.4

165.3

Nepal

1.6

0

14.7

Pakistan

7.2

10.7

79.6

Sri Lanka

1.0

0

6.6

Total

81.74

59.0

677.4

0 0

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