65
4.2.2. Habitat Suitability Model
The whole spatial variables were analyzed using PCA, except for the variable of montane forest area. This variable was omitted from calculation;
because of the whole samples is zero which could not be used in PCA. There is only two principal components PCs are interpretable based on
broken stick distribution, i.e. PC I and II. For each component has a percentage variance 37.80 and 24.03 subsequently. Table 7 shows the loadings, percent
variance and broken stick distribution value. The weight of each variable was further transformed into the range of value
0 – 1. The final weight calculation result can be seen in the Table 7. The weight of each variable given by the PCA shows the influence level to determine habitat
suitability. Table 7. Principal Component Loadings and Weight for Each Spatial Variable
Variable PC I
PC II Weight
HSE 0.244 -0.486 0.1302
HPRI -0.180 0.522 0.1401
HDR 0.367 -0.254 0.0984
HGB -0.345 0.297 0.0936
SL1 0.361 0.319 0.0975
SL2 -0.247 -0.303 0.0817
SL3 -0.361 -0.259 0.0975
RIV -0.240 -0.110
0.0658 NONFOR
-0.345 0.009 0.0936 JL
-0.394 -0.257 0.1063 Eigen Values
3.780 2.40277
Percent Variance 37.80
24.03 Broken Stick Distribution
29.29 19.29
Note: Bracket beside the weight value shows the rank
By knowing the weight of criteria, the suitability habitat model can be stated as:
10 9
8 7
6 5
4 3
2
106 .
093 .
065 .
097 .
081 .
097 .
093 .
098 .
14 .
13 .
1
X X
X X
X X
X X
X X
S +
+ +
+ +
+ +
+ +
=
where X
1
is the area of secondary forest, X
2
is the area of primary forest, X
3
is the area of low-land forest, X
4
is the area of submontane forest, X
5
is the area which has slope 0-15, X
6
is the area which has slope 15-45, X
7
is the area which has slope more than 45, X
8
is distance to river waterbody, X
9
is distance to non- forested land, and X
10
is distance to roadtracks.
66 Based on the calculation and considered habitat factors, habitat with a low
suitability shares fairly extent of whole area of Mt Salak. The largest portion of Mt Salak is dominated suitable, low suitable and moderate suitable respectively.
Figure 41 completely shows the position of suitability class based on their area.
9.620466 12.694184
26.782783
5.529045 25.772217
34.856725
17.528023
5 10
15 20
25 30
35 40
Highly Suitable Suitable
Moderate Suitable Less Suitable
Low Suitable Not Suitable
No Data
Figure 41. Area of each Javan Gibbon Habitat Suitability in Mt. Salak in km
2
67 Figure 42. Map of Javan Gibbon Habitat Suitability in Mt. Salak
68
4.3. Discussion
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