SAMBHAR LAKE ENVIRONMENTAL CRISIS: ECOLOGY, THREATS & CONSERVATION

Why In News?

Research indicates that rapid growth in industrial and illegal salt pans is damaging Sambhar Lake's hydrology and biodiversity, threatening the survival of this globally important wetland.

About Sambhar Lake

Sambhar Lake is India's largest inland salt lake, it is located 80 km southwest of Jaipur, Rajasthan.

The wetland spreads across Jaipur, Nagaur, and Ajmer districts, located within the Aravalli Range.

Fed by six monsoon-dependent rivers (Mentha, Rupangarh, Khari, Khandela, Medtha, Samod), its area fluctuates between 190–230 sq km.

The lake drives a massive local economy, producing roughly 196,000 tonnes of clean salt annually, which constitutes about 9% of India's total salt production.

Designated as a Ramsar Site of International Importance in 1990 and recognized as a Key Biodiversity Area in 2004.

Avian Habitat: A vital wintering area for Northern Asian migratory birds and India's second-largest flamingo breeding ground.

Saline Ecosystem: Its hypersaline niche supports halophilic microbes and spirulina, while surrounding vegetation shelters fauna like desert foxes and saw-scaled vipers.

What are Industrial Salt Pans?

Industrial salt pans consist of artificially constructed, shallow depressions designed to extract, evaporate, and harvest salt from sub-soil brine (saline groundwater) on a massive commercial scale.

Traditional vs Industrial Salt Production

• Traditional salt production relies entirely on the natural monsoon cycle, capturing rainwater that floods the lake bed and crystallizes into salt during the dry season.
• Industrial salt production by using deep borewells and motorized pumps to continuously siphon underground brine into crystallization pans throughout the entire year.

How are Salt Pans Threatening Sambhar Lake?

Hydrological Alteration

• Extensive pipeline and cable networks laid by salt operators across the lakebed obstruct natural water flows.
• Artificial dams and embankments fracture the catchment area, destroying the basin's natural hydrology.

Encroachment of Wetland Area

• Illegal units encroach upon the core wetland, transforming pristine beds into barren salt pans.
• Unlawful activities have consumed approximately 30% of the lake's original surface area.

Habitat Degradation

• Massive drainage forces the wetland to shrink, turning aquatic habitats into degraded saline soil.
• Industrial machinery and refineries destroy the ecological character essential for native flora and fauna.

Environmental Consequences

Decline in Biodiversity

• Ecosystem changes cause a drop in aquatic and avifaunal biodiversity.
• Fragmentation destroys food webs and eliminates essential halophilic bacteria.

Increased Bird Mortality

• A 2019 avian botulism outbreak killed over 20,000 birds.
• Low oxygen and high temperatures allow Clostridium botulinum to produce lethal toxins.
• Unregulated high-voltage wires frequently electrocute migratory birds.

Shrinking Wetland Area

• Wetland area plummeted from 30.7% to just 3.4%.
• The water catchment area fell from 53,000 sq km (1969) to 7,560 sq km (2004).

Loss of Ecosystem Services

• Degradation destroys the traditional livelihoods of local communities.
• The region loses water storage, flood mitigation, and groundwater recharge. 

Source: THEHINDU