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Mangroves' Secret Service: Billions in Clean Water
6 Jul
Summary
- Mangroves remove 870,000 tonnes of nitrogen annually.
- This nitrogen cleanup service is valued at $8.7 billion yearly.
- Mangroves purify nitrogen twice as efficiently as land soils.
Mangrove forests are now recognized for a significant ecosystem service beyond their carbon sequestration capabilities: cleaning nitrogen pollution. A comprehensive global study reveals these coastal woodlands annually remove around 870,000 tonnes of nitrogen from marine environments. This vital purification function is estimated to be worth approximately $8.7 billion each year, a figure considerably higher than the value typically assigned to mangrove carbon storage.
The research, combining data from 42 mangrove sites worldwide, demonstrates that mangroves' intricate root systems effectively trap sediment and microbes. These aid in converting problematic nitrogen compounds in the water into inert nitrogen gas, thereby removing the pollutant entirely from the ecosystem. This process is remarkably efficient, with mangroves purifying nitrogen at double the rate of typical land-based soils.
Scientists are advocating for the formal recognition of this "blue nitrogen" service, suggesting it strengthens the case for mangrove conservation. They propose that enhancing mangrove protection and restoration could dramatically increase global nitrogen removal. Under improved conditions, mangroves could potentially remove up to five million tonnes of nitrogen annually, valued at around $57 billion, offering a significant contribution to global water quality management.
