What processes contribute to desertification and how can sustainable management mitigate it?

• A. Industrial development and mining; use of chemical fertilizers.
• B. Urbanization and air pollution.
• C. Overgrazing, deforestation, drought; management: soil conservation, afforestation, water harvesting.
• D. Increased rainfall and erosion control.

Answer: (C)

Desertification arises when productive land loses its ability to support crops and vegetation because soils become degraded under stress from climate and human use. The dominant drivers are overgrazing, which removes protective vegetation and exposes soil to wind and water erosion; deforestation, which eliminates root networks that hold soil and reduce moisture loss; and drought, which lowers soil moisture and makes the land more vulnerable to erosion and degradation. When these forces act together, soil structure breaks down, organic matter declines, and vegetation recovery slows, gradually pushing land toward desert-like conditions.

Mitigation focuses on restoring soil health and conserving water. Soil conservation practices—keeping the soil covered with living or removed mulch, implementing contour farming or terracing, reducing bare soil, and promoting organic matter—help reduce erosion, improve infiltration, and retain moisture. Planting trees or shrubs (afforestation or reforestation) stabilizes the soil with deeper root systems and adds windbreaks, which further curtail erosion and improve local microclimates. Harvesting rainwater and improving water use—such as small dams, check structures, and other water-collection methods—boost available moisture for soils and vegetation, making rehabilitation possible even during dry periods. Combined with sustainable grazing practices that prevent overuse of pasture, these measures address both the cause and the consequence of desertification, helping land recover its productivity.