Aravalli Range as a Natural Barrier Against Dust Storms

Context

A recent dust storm in Rajasthan has highlighted the ecological significance of the Aravalli Range, which acts as a natural barrier between the Thar Desert and the densely populated Indo-Gangetic Plains. However, increasing anthropogenic pressures are weakening this protective function.

Ecological Significance of the Aravalli Range

1. The Aravalli Range acts as a natural barrier that restricts the movement of dust and sand from the Thar Desert towards the Indo-Gangetic Plains.
2. Obstacle dunes along its western slopes provide evidence of its role in trapping wind-borne sediments.
3. Vegetation cover further reduces dust transport by filtering airborne particles and slowing wind movement.

Extent and Causes of Degradation

1. A Forest Survey of India (2018) assessment reported the disappearance of several Aravalli hills due to anthropogenic pressures.
2. Significant degradation has been recorded in areas such as Naraina, Kalwar, Kotputli, Jhalana, and Sariska.
3. Major drivers of degradation include:

1. Mining activities;
2. Deforestation and loss of vegetation cover;
3. Urbanisation and infrastructure expansion;
4. Land-use changes and encroachments;
5. Overgrazing and unsustainable resource use.

1. The formation and expansion of gaps within the range have weakened its capacity to intercept dust-laden winds.

Implications of Degradation

1. Increased movement of dust into the Indo-Gangetic Plains.
2. Deterioration of air quality, particularly in Delhi-NCR and adjoining regions.
3. Changes in local rainfall and microclimatic conditions.
4. Adverse impacts on agriculture, public health, and ecosystem stability.
5. Increased environmental vulnerability and reduced climate resilience in northern India.

Conclusion

The Aravalli Range is a critical ecological asset that plays a vital role in environmental security and climate regulation in northern India. Conserving and restoring the range through sustainable land-use practices, afforestation, and regulation of mining activities is essential for enhancing climate resilience and ensuring environmental sustainability.