TN doubles mangrove cover, Chennai adds just 18 hectares in three years
In the last 10 years, when several other districts such as Tiruvarur and Thanjavur, planted more than 2,142 hectares of mangroves, Chennai, which once housed crucial mangrove forests in the Kosasthalaiyar, Cooum and Adyar estuaries, added only 141 hectares, which is a mere 1.5% of state's coverage.
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A recent report —
Blue Carbon Monitoring for Mangroves
of Tamil Nadu — done by Anna University for the Tamil Nadu govt, mapped the mangrove cover areas through physical visits and also by satellite, highlighting before and after images. This will help the govt address areas with weak growth.
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Kurian Joseph, professor, Centre for Environmental Studies, Anna University, said coastal development, pollution due to wastewater, and change in land use are the reasons for the degradation of mangroves in the estuary regions of the city. "Mangrove forests are among the most carbon-rich habitats. They are a natural coastal defence as they mitigate flood risks by reducing wave energy, attenuating storm surges, and stabilising shorelines," he said.
He added that the mangroves also trap silt, thereby enriching the soil. "Their aerial roots offer a safe haven to fish, birds, turtles, snakes, and other insects."
In some locations such as the Adyar estuary, at least 57,000 saplings belonging to various species, including Rhizophora, Avicennia, Acanthus, Excoecaria, and Bruguiera, thrived and turned into lush forests. More mangroves also invite crabs, prawns, and fish, improving the local livelihoods of fishermen. Fishermen in Ennore said due to ash effluents from the thermal plants, prawn breeding had stopped. As a result, they go to Pulicat for catch.
The study also identified Tiruvarur as the district with the largest mangrove area of 2,142 hectares, including 672 hectares of plantations. Thanjavur follows with 2,063 hectares, made up of 854 hectares of plantations and 1,209 hectares of natural mangroves. Together, the two districts account for nearly half of the state's total mangrove cover.
In addition to their ecological value, mangroves serve as powerful carbon sinks. Cuddalore tops the list in carbon storage with 249 tonnes per hectare, followed by Tiruvarur (145 tonnes/ha) and Thanjavur (77.5 tonnes/ha). In contrast, mangrove patches in Villupuram (2.59 tonnes/ha) and Tiruvallur (13.1 tonnes/ha) store significantly less carbon.
Environment, climate change and forests department secretary Supriya Sahu said that under the Green Tamil Nadu Mission, the govt saved 1,700 hectares of degraded mangroves, apart from new plantations. "We are creating village councils in all districts to rope in villagers to plant mangroves. They take care of it. We are collaborating with Anna University and MSSRF to boost coverage," she said.
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