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<p>The Nicobar Islands experienced 97% mangrove loss due to the coupled effects of 2004 Indian Ocean tsunami and coastal subsidence. The new intertidal areas formed in the former terrestrial zones offered conducive environment for mangrove colonization and provided an opportunity to understand vegetation and carbon stock recovery following a unique large-scale disturbance. We compared mangrove vegetation (dead and remnant trees) from 6 subsidence affected sites in 2011 (representing pre-tsunami) and 13 sites with mangrove colonization in 2022 (representing post-tsunami). The species composition and density have significantly differed between pre- and post-tsunami, where <i>Rhizophora</i> L., and <i>Bruguiera gymnorhiza</i> (L.) Lam. ex Savigny dominated during pre-tsunami; whilst <i>Sonneratia lanceolata</i> Blume and <i>Lumnitzera racemosa</i> Willd. have dominated during post-tsunami. Similarly, the carbon stocks have also shown a significant change between pre- and post-tsunami phase. The total biomass in 2022 was nearly sixfolds lesser than pre-tsunami values (Biomass = 205.03 ± 22.52&#xa0;Mg/ha; Carbon stock = 91.56 ± 9.58&#xa0;Mg/ha). Our study established a crucial baseline information on change in mangrove vegetation composition, and carbon stock after the 2004 natural disturbances. As various ecological and environmental factors limit carbon stock accumulation in these new intertidal zones, implementing site-specific management interventions can accelerate the carbon stock recovery.</p>

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Mangrove carbon stock recovery following the major vegetation loss after the 2004 Indian Ocean tsunami and coastal subsidence in the Nicobar Islands

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Vedagiri Thirumurugan,
  • K. T. Shamna,
  • Anoop Raj Singh,
  • G. Gnanasekaran,
  • Nehru Prabakaran

摘要

The Nicobar Islands experienced 97% mangrove loss due to the coupled effects of 2004 Indian Ocean tsunami and coastal subsidence. The new intertidal areas formed in the former terrestrial zones offered conducive environment for mangrove colonization and provided an opportunity to understand vegetation and carbon stock recovery following a unique large-scale disturbance. We compared mangrove vegetation (dead and remnant trees) from 6 subsidence affected sites in 2011 (representing pre-tsunami) and 13 sites with mangrove colonization in 2022 (representing post-tsunami). The species composition and density have significantly differed between pre- and post-tsunami, where Rhizophora L., and Bruguiera gymnorhiza (L.) Lam. ex Savigny dominated during pre-tsunami; whilst Sonneratia lanceolata Blume and Lumnitzera racemosa Willd. have dominated during post-tsunami. Similarly, the carbon stocks have also shown a significant change between pre- and post-tsunami phase. The total biomass in 2022 was nearly sixfolds lesser than pre-tsunami values (Biomass = 205.03 ± 22.52 Mg/ha; Carbon stock = 91.56 ± 9.58 Mg/ha). Our study established a crucial baseline information on change in mangrove vegetation composition, and carbon stock after the 2004 natural disturbances. As various ecological and environmental factors limit carbon stock accumulation in these new intertidal zones, implementing site-specific management interventions can accelerate the carbon stock recovery.