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International Journal of Marine Science 2013, Vol.3, No.9, 72-78
http://ijms.sophiapublisher.com
74
Table 1 Total organic carbon (TOC) content in the biomass of plant components of sample trees of
Bruguiera gymnorrhiza
and (n=14)
Lumnitzera racemosa
(n=10).
Total organic carbon (TOC) content (kg/kg dry weight)
Wood
(stems + branches)
Leaves
Roots (above +
below ground)
Total
(mean)
Ratio of above
to below ground
TOC
Mean TOC
content (kg C
per kg biomass)
0.54±0.003
0.51±0.002
0.52±0.003
0.52±0.002 2.96
Bruguiera
gymnorrhiza
Percentage
TOC
53.50
21.30
25.20
-
-
Mean TOC
(kg C per kg
biomass)
0.55±0.001
0.44±0.002
0.54±0.003
0.54±0.002 2.90
Lumnitzera
racemosa
Percentage
TOC
71.00
3.50
25.50
-
-
Figure 1 Percentage TOC in biomass of plant components varied in different stem diameters of sample trees of
B. gymnorrhiza
and
L. racemosa.
Although average TOC per tree was greater in
B.
gymnorrhiza
than in
L. racemosa,
in most of stem
diameter classes available, percentage potentially
sequestered carbon content per tree in the same
diameter classes was higher in
L. racemosa
than
of
B.
gymnorrhiza
(Figure 3).
2.2 Development of allometric relationship between
dbh and TOC, and estimated the accuracy
A positive correlation (p<0.01) with leaner
relationship was revealed between log-transformed
values of TOC content in biomass of plant
components and dbh with r
2
>0.80 (coefficient of
determination), except for leaves of the two species
(Figure 4). The allometric equations were in the form,
log
10
(TOC)=B
0
+ B
1
log
10
(dbh), B
0
and B
1
are the
regression coefficients (Table 2).
2.3 Accuracy of organic carbon estimation using
the allometric relationships
Accuracy of developed allometric relationships was
tested with one real data set which not used for
developing the equation. Similarly, each equation was
tested with more than 10 sets of real data obtained
from the study. Difference between actual and
estimated values of organic carbon content in biomass
of each plant components negligibly low and are
presented in Table 3.