Moderate
According to a latest research, Pakistan is predominantly a dryland country; 80% of its land area is arid and semi arid, 12% sub-humid and 8% under humid climate. Thus , soils of arid & semi-arid regions are vulnerable to a wide range of degradation process. As the case in arid and semi-arid climates elsewhere in south-central/southern Asia and Sub-Saharan Africa; _________________ are among the major causes of soil degradation and desertification?
Correct answer: D. All of the above
- A. Drought stress
- B. Accelerated erosion & salinization
- C. Depletion of soil fertility and SOM
- D. All of the above
Explanation
Dryland degradation is driven by interacting stresses, including drought, accelerated erosion, salinization, nutrient depletion and loss of soil organic matter. Thus all three listed processes are major causes of degradation and desertification.
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