Evaluation of geochemical impact of tsunami on Pichavaram mangrove ecosystem,southeast coast of India |
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| Authors: | Rajesh Kumar Ranjan AL Ramanathan Gurmeet Singh |
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| Institution: | (1) Biogeochemistry Laboratory, School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, 110067, India;(2) Department of Biology, Ecosystem Management Research Group, University of Antwerp “Campus Drie Eiken”, Universiteitsplein 1.BE-2610, Antwerpen, Wilrijk, Belgium |
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| Abstract: | The 26 December 2004-tsunami has deposited sediments in the Pichavaram mangrove ecosystem, east coast of India. Ten surface
and three core sediment samples were collected within 30 days of the event and analyzed for nutrients. Water samples were
also analyzed to see the impact of tsunami on the geochemical behavior of nutrients. An increase in the concentration of various
nutrients namely nitrate and phosphate was observed. The geochemistry of the mangrove forest was observed to be influenced
by a number of factors like rapid increase of aquaculture farms, agricultural practices and the anthropogenic discharge from
the nearby-inhabited areas. Further the sediment column was disturbed due to energetic tsunami waves, which has caused a sheer
increase in the dissolved oxygen in water. As a result, the change in the redox potential has resulted in change in the nutrients
absorbed/associated with the sediments. In addition, role of retreating water after tsunami on the nutrient geochemistry was
also evaluated. |
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| Keywords: | Pichavaram Mangroves Tsunami Nutrients Sediment Geochemical changes |
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