4.4.1 Comparison between field and biomass model
The difference value between trees biomass resulted from field and model was used to analyst the correlation of DBH and total height that
significantly influence on trees biomass.
4.4.1.1 DBH on field and biomass model
The curve pattern of Figure 4.29 - Figure 4.31 show the linear correlation between trees biomass and DBH occurred when the trees diameter reach 60 cm. It
means that the diameter will significantly influence the biomass. The increasing of trees biomass in forest cover type A followed by the trees diameter, when trees
diameter already reach 60 cm.
y = 78.903x - 1377.5 R
2
= 0.631 y = 1.6142x
2
- 78.291x + 698.52 R
2
= 0.929
-4000 -2000
2000 4000
6000 8000
10000 12000
14000 16000
18000
50 100
150
DBH cm D
iffe re
n c
e
f ie
ld bi
oma s
s mod
e l bi
oma s
s
Plot A Linear Plot A
Poly. Plot A
y = 237.5x - 14143 R
2
= 0.8623
-4000 -2000
2000 4000
6000 8000
10000 12000
14000 16000
18000
20 40
60 80
100 120
140
DBH cm D
iffe re
n c
e
f ie
ld bi
om a
s s
m o
de l b
iom a
s s
Plot A Linear Plot A
Figure 4.29 DBH on field and model trees biomass comparison of forest cover type A.
y = 62.726x - 1230 R
2
= 0.8931
-2000 -1000
1000 2000
3000 4000
10 20
30 40
50 60
70 80
DBH cm D
iffe re
n c
e
fi e
ld bi om
a s
s m
o d
e l
b iom
a s
s
Plot B Linear Plot B
y = 32.924x - 4.1374 R
2
= 0.6943
500 1000
1500 2000
2500 3000
10 20
30 40
50 60
70 80
DBH cm D
iffe re
n c
e
fi el
d b
io m
as s
m o
d el
b io
m ass
Plot B Linear Plot B
Figure 4.30 DBH on field and model trees biomass comparison of forest cover type B.
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y = 10.47x - 127.76 R
2
= 0.454 y = 0.3303x
2
- 7.8783x + 26.758 R
2
= 0.6214
-400 -200
200 400
600 800
1000 1200
1400
10 20
30 40
50 60
70 80
DBH cm D
if fer
en c
e
fi e
ld bi om
a s
s m
ode l bi
om a
s s
Plot C Linear Plot C
Poly. Plot C
y = 21.576x - 565.03 R
2
= 0.5994
-400 -200
200 400
600 800
1000 1200
1400
10 20
30 40
50 60
70 80
DBH cm D
iffe re
n c
e
fi el
d b
io m
ass m
o d
el b
io m
ass
Plot C Linear Plot C
Figure 4.31 DBH on field and model trees biomass comparison of forest cover type C.
-250 -200
-150 -100
-50 50
100 150
10 20
30 40
50
DBH cm D
if fer
en ce
f iel
d b
io m
ass m
o d
e l
bi o
m a
s s
Plot D Linear Plot D
Figure 4.32 DBH on field and model trees biomass comparison of forest cover type D.
The correlation trend of cover type A is different from the pattern of cover types B and C. The diameter in forest cover type B and C will significantly
influence the trees biomass increasing when the trees diameter reaches 30 cm Figure 4.30 and Figure 4.31
The correlation curves of forest cover type D is constant flat, means that trees diameter give no significant change on trees biomass increasing Figure
4.32. Forest cover D is a cover type with agro-forestry system that dominated with cacao. The homogeneity of cacao plantation determines this curve regression
70
pattern.
4.4.1.2 Total height on field and model biomass
Kategori