European Journal of Scientific Research - EuroJournals

451 Md. Shahadat Hossain and Gouri Rani Banik
The similar trend of this result was found by (Kilawe et al., 2001) in Pinus patula and
Eucalyptus saligna, Ravichandran and Balasubramanian, 2000 in Casuarina equisetifolia and Raja
Walayat Hussain, 1989 in Acacia nilotica, Acacia albida, Acacia tortilis and Prosopis cineraria.
Figure 2: Linear relationships between diameter at breast height (DBH) and Total organic carbon content of
growing species. Here Figure a) Dipterocarpus turbinatus. Fig.b) Acacia auriculiformis and Fig. c)
Eucalyptus camaldulensis. The value of coefficient of determination (R 2 ) is shown.
Fig. a Fig. b Fig. c
Rrgression equation for Calculating Carbon
from DBH of Dipterocarpus turbinatus
50
0
6 6.5 11.2 12.4 12.6
DBH(c m)
R 2 = 0.9629
Regrassion equation for calculating carbon
from DBH for Acacia auriculiformis
80
60
40
20
0
DBH (c m)
12 12.5 15 16 17
Relationship between Height (m) and total organic carbon content (kg) of the
growing trees
Dipterocarpus turbinatus
The regression equation for calculating total organic carbon content (kg/tree) was found Y= -39.126 +
5.925X. Here Y represents the total organic carbon content of tree and X represents the Height (m).
From the equation it implies that the total organic carbon content is increased by 5.925 kg for per unit
increase in height. The coefficient of determination (r 2 ) is 0.962 and the relationship was significant at
P>0.01. The result showed a positive correlation between Height and total organic carbon content of
the species (Figure 3).
Acacia auriculiformis
The regression equation for calculating total organic carbon content (kg/tree) was found Y= - 47.014 +
6.745X. Here Y represents the total organic carbon content of tree and X represents the Height (m).
From the equation it implies that the total organic carbon content is increased by 6.745 kg for per unit
increase in height. The coefficient of determination (r 2 ) is 0.966 and the relationship was significant at
P>0.01.
Eucalyptus camaldulensis
The regression equation for calculating total organic carbon content (kg/tree) was found Y= -6.352 +
4.261X. Here Y represents the total organic carbon content of tree and X represents the height (m).
From the equation it implies that the total organic carbon content is increased by 4.251 kg for per unit
increase in height. The coefficient of determination (r 2 ) is 0.980 and the relationship was significant at
P>0.01.
In the present study the linear correlation between total height (m) and total organic carbon
content (m) was found stronger in Dipterocarpus turbinatus, Acacia auriculiformis and Eucalyptus
camaldulensis. This trend was found similar with the result of the study by Ravichandran and
Balasubramanian, 2000 in Casuarina equisetifolia. The linear correlation between total height (m) and
total organic carbon content was found stronger in Dipterocarpus turbinatus, Acacia auriculiformis.
Though there is a positive relation between total height and total organic carbon in Eucalyptus
camaldulensis, Artocarpus chaplasha, and Chickrassia tabularis but the correlation was not so strong.
R 2 = 0.966
Regression equation for calculating carbon from DBH
for Eucalyptus camaldusensis
Carbon(kg)
80
60
40
20
0
DBH (cm)
7.2 7.5 11.5 12 12.2
R 2 = 0.9672