Aeolian processes, driven by wind-mediated erosion, transport, and deposition, act as primary catalysts for land degradation in arid regions, affecting nearly 33% of global land area as per UNCCD reports.

Aeolian Transport: Suspension, Saltation and Surface Creep

Role of Aeolian Processes in Desertification

1. Sand Encroachment: Active dune migration into fertile peripheries transforms arable land into wasteland.

   • Eg: Expansion of the Thar Desert towards the Indo-Gangetic plains.

2. Soil Deflation: Wind removes loose, non-cohesive surface particles, lowering the land surface.

   • Eg: Formation of blowouts and Hamada (stony deserts) in the Sahara.

3. Vegetation Burial: Accumulation of wind-blown sand smothers native flora, disrupting the ecological balance.

   • Eg: Sahel region’s loss of acacia cover due to shifting sands.

4. Albedo Alteration: Dust deposition changes surface reflectivity, intensifying local thermal highs and aridity.

5. Hydrological Stress: High-velocity winds increase evapotranspiration rates, depleting scarce groundwater.

Impact on Land Degradation

1. Topsoil Stripping: Selective removal of nutrient-rich silt and organic matter (Humus) reduces soil fertility.

2. Saltation Damage: Bouncing sand grains break down soil aggregates, leading to surface crusting.

3. Nutrient Export: Wind carries fine clay particles, essential for cation exchange, over long distances.

4. Abrasive Erosion: Wind-borne particles physically damage plant tissues and bark through sand-blasting.

5. Atmospheric Loading: Increased PM10 dust levels reduce solar radiation, hindering crop photosynthesis.

Combatting these requires Nature-based Solutions like Shelterbelts and the Great Green Wall initiative, vital for achieving SDG 15.3 regarding Land Degradation Neutrality.