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International Journal of Marine Science 2013, Vol.3, No.9, 72-78
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78
weight ratios of each plant component of the two
species were used to estimate biomass of plant
components and thus of the total plant.
In the present study, stems, branches and leaves were
considered as above ground plant components while
below-ground roots and knee roots were considered as
below-ground plant components.
4.3 Determination of total organic carbon (TOC)
content of mangroves
Samples from woody stems, leaves and roots of
B.
gymnorrhiza
and
L. racemosa,
were
taken in
triplicates from five sample trees that represent the
respective ranges of dbh, to measure TOC. Fresh
samples were initially air dried and subsequently oven
dried at 60
℃
until constant weight and then ground
with an electric grinder and sieved through 150 µm
mesh. Roots, both above and below-ground, were
considered as one component. Wet oxidation method
without external heating procedure followed by
colorimetric method based on absorbance at 600 nm,
using a UV- visible spectrophotometer (Anderson and
Ingram, 1998; Schumacher, 2002) was adopted to
estimate the TOC in each plant component.
Acknowledgement
Authors extend their gratitude to the financial and laboratory facilities
provided by the Open University and University of Kelaniya, Sri Lanka.
Generous assistance provided by Mr. W. A. Sumanadasa and research
support staff at the National Aquatic Resources Research and Development
Agency’s Regional Centre at Kadolkele, Negombo, Sri Lanka, in collecting
data from the mosquito-infested mangrove areas of Negombo estuary is
gratefully acknowledged.
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