18
Table 4 LAI of Cidanau watershed
NDVI Class
2002 LAI
2004 LAI
2 2.0 2.0 3 3.3 3.3
4 4.6 4.5 5 5.7 5.5
6 6.8 6.9 7 7.8 8.3
8 - 9.6 Average 4.3
5.0 Table 5. LAI of some vegetation types
Vegetation Type LAI
Low-vegetated burnt forest
2.5-6.3 Low-vegetated forest
2.5-3.2 Primary forest
4.4-8.4 Conifer forest
1.4-3.9 Garden 1.0-3.3
Young conifer forest 5.3-9.6
Mature conifer forest 7.9-13.0
Source: Turner, et al. 1999 in Djumhaer 2003
4.3. NPP
fAPAR used in this research was Prince and Goward’s fAPAR 1995 because it represented
all biomes in the world. It was also newer than Ruimy’s all biomes fAPAR equation 1994.
There was a problem when using the NetPro v 1.0 to estimate 2004 NPP. The model cannot
run. Then, it was known that 2004 was a leap year and consisted of 366 days; therefore, it was
different from the other two years. The problem had to be solved so that the 2004 NPP could still
be estimated. The step taken was the 29
th
February data of 2004 was erased to make its day number to 365.
4.3.1 NPP of Cidanau Watershed
NPP does not only depend on the NDVI class’ average but also on how wide the class is.
High Class 5, 6, 7, and 8 NDVI occurred in 2004 but in narrower area. The fall was obvious for
Class 5 in 2004 compared with 2002. NPP become higher in 2002 than in 2004. Light use
efficiency parameters e from June 2002 and Ochi and Shibasaki 1999 in June 2004
produced the same results where the 2002 NPP was the highest NPP Fig. 4.
The run of the model resulted same NPP class as the NDVI class of shp file input. There
were seven NPP classes in 2002 and eight in 2004. The comparison of per class NPP showed
the higher
Class 2
occurred in 2002
50 gC m
-2
year
-1
, Class 3 occurred in 2004
1318 gC m
-2
year
-1
, Class
4 in
2004 2473 gC m
-2
year
-1
with slightly difference with 2002 2463 gC
m
-2
year
-1
, Class 5 in 2002
3479 gC m
-2
year
-1
, Class 6 and Class 7 in 2004 4785 gC m
-2
year
-1
and 6087 gC m
-2
year
-1
, and only 2004 had Class 8 7361 gC m
-2
year
-1
. This rank result was same for e June and e Ochi
and Shibasaki. The NPP in brackets are when e June was used see Table 6, when e Ochi and
Shibasaki and dynamic e were used can be read in Appendix 1, respectively. For better
understanding, the illustrations are in Figure 19.
The Class 8 of the year 2004 had fAPAR 1.000. The Prince and Goward’s fAPAR equation
1995 gave more than 1.000 fAPAR but the model displayed and considered the fAPAR as
1.000. fAPAR is fraction of absorbed PAR that can not be more than 1.000. This number has
already described that the plants absorbed all part of PAR.
When the total NPP compared, total NPP in 2002 was 28451488
gC and in 2004 was
25496753 gC. Divided by the total area of
Cidanau , the annual NPP became 1327 gC m
- 2
year
-1
in 2002 and 1190 gC m
-2
year
-1
in 2004. The comparison of total NPP per year
gC m
-2
year
-1
gave different result than when NPP was compared per class see Figure 20.
Total NPP was the sum of each class NPP multiplied by its area. The result then divided by
the total area of the watershed based on digitation process of the research, 21446 ha. If the highest
per class NPP was mainly occurred in Class 8 of 2004, the highest annual NPP occurred in 2002.
19
N P P of C i da n a u Wa t e rs h e d, pe r Cl a s s e J u n e
1000 2000
3000 4000
5000 6000
7000 8000
1 2
3 4
5 6
7 8
NPP Classes NP
P g
C m
2
y r
2002 2004
Figure 19. Comparison of per Class NPP of Cidanau Watershed e June
NPP of Cidanau Watershed
200 400
600 800
1,000 1,200
1,400 1,600
1,800
e June e Ochi Shibasaki
Dynamic e
e
NP P
g C
m
2
y r
2002 2004
Figure 20. Cidanau watershed NPP of the research years The year of 2004 had the highest per class
NPP and had more NPP classes than the year of 2002 but still it could not reach the highest
annual NPP. The area of NDVI classes in Table 3 shows that higher NDVI classes in 2004 covered
narrower area. It means that there were decrease of NDVI in 2004 and also resulted in decrease of
NPP. The fall of NDVI represented decrease in the “greenness” of the land.
NPP classification and showed same result as NDVI classification. The position of higher
and lower NPP was same as the position of NDVI. Higher NPP also occurred in private
garden land beside in forest and Rawa Danau preserve. From the NPP scope, this condition
means not only the forests in Cidanau that had potency to absorb carbon dioxide, but the private
garden in Cidanau also had the same potency.
20
Table 6. NPP of Cidanau watershed – e June
2002 2004
NDVI Class
NPP Class
gC m
-2
year
-1
Area ha
Total per Class NPP
gC year
-1
NPP Class
gC m
-2
year
-1
Area ha
Total per Class NPP
gC year
-1
1 8115
0 0 8115
2 50
2234 111946 37
2278 83842
3 1231
2758 3395821 1318
3316 4369168
4 2463
4303 10596241 2473
5866 14508167
5 3479
3746 13032450 3415
1798 6140995
6 4531
289 1309555 4785 48
229660 7
5476 1
5476 6087 15 91312
8 7361
10 73609
Total 21446 28451488
21446 25496753 Annual NPP gC m
-2
year
-1
1327 1190
4.3.2 NPP of Rawa Danau Preserve
