Improved model calculation of atmospheric CO2 increment in affecting carbon stock of tropical mangrove forest
By RAGHAB RAY, CHUMKI
CHOWDHURY, NATASHA MAJUMDER,
MANAB KUMAR DUTTA, SANDIP
KUMAR MUKHOPADHYAY and
TAPAN KUMAR JANA*,
*Department
of Marine Science, University of Calcutta,
35, B. C. Road,
Kolkata-700019, India
(Manuscript received 15
June 2012; in final form 18 March 2013)
Citation: Tellus B, 65, 18981, http://dx.doi.org/10.3402/tellusb.v65i0.18981
ABSTRACT
Because of the difficulties in setting up arrangements in
the intertidal zone for free-air carbon dioxide enrichment experimentation, the
responses to increasing atmospheric carbon dioxide in mangrove forests are
poorly studied. This study applied box
model to overcome this limitation, and the relative changes in present level of
reservoirs organic carbon contents in response to the future increase of
atmospheric carbon dioxide were examined in the Avicennia dominated mangrove forest at the land-ocean boundary of
northeast coast of the Bay of Bengal. The above and below ground biomass
(AGB+BGB) and sediment held different carbon stock (53.20±2.87 Mg C ha-1 (mega
gram carbon per hectare) versus 18.52±2.77 Mg C ha-1). Carbon uptake
(0.348 mg C m-2s-1) is more than offset by losses from
plant emission (0.257 mg C m-2s-1) and litter fall (13.52
μg C m-2s-1) was more than soil CO2 and CH4
emission (8.36 and 1.39 μg C m-2s-1, respectively).
Across inventory plots Sundarban mangrove forest carbon storage in above and
below ground live trees and soil
increased by 18.89 and 5.94 Mg C ha-1 between June 2009 and December
2011. Box model well predicted the dynamics of above and below ground biomass
and soil organic carbon and increasing atmospheric carbon dioxide
concentrations could be the cause of 1.1 and 1.57 fold increases in carbon
storage in live biomass and soil, respectively across Sundarban mangrove forest
rather than recovery from past disturbance.
Keywords: carbon
stock, CO2 sensitivity, box model, mangrove forest, India
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