LAI Estimation of net primary productionusing the NetPro 1.0 model Case study: Cidanau watershed, Serang
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Table 3. Class of NDVI of the Cidanau watershed, 2002 and 2004
2002 2004
Class NDVI
Classification NDVI
Area ha
NDVI Area
ha
1 0 0 8115 0 8115
2 0-0.1 0.052 2234
0.051 2278 3 0.1-0.2
0.151 2758 0.155 3316
4 0.2-0.3 0.254 4303
0.249 5866 5 0.3-0.4
0.339 3746 0.326 1798
6 0.4-0.5 0.427 289
0.437 48 7 0.5-0.6
0.506 1 0.543
15 8 0.6-0.7
0.650 10 Average
0.141 0.126 The highest NDVI class in 2004 was 0.650,
which resulted in the highest NPP class. The NDVI classification can be seen at the
Table 3. NDVI was classified according to the range values. Average of an NDVI class was
obtained to give an input for NetPro model. The average of NDVI for overall watershed were only
0.141 2002 and 0.126 2004 or only in Class 3 range.
In 2002, the site was dominated by Class 4 and Class 5. Meanwhile, in 2004 it was
dominated by Class 3 and Class 4. The obvious difference was the area of Class 5 was high in
2002 but then dropped in 2004. This fact would affect the result of NPP estimation explained
later.
The position of lower and higher NDVI can be analyzed visually by comparing its
distribution with the land use of Cidanau. Because the main interest in Cidanau is about the
maintenance of private garden, the NDVI of private garden is important. This NDVI value is
used to estimate NPP of the research site.
The position of lower NDVI, the Class 1 and Class 2, in 2002 and in 2004 was mainly in
paddy field and forest in higher land figure 8- 12. The lower NDVI classes occurred in forested
area were caused by cloudiness in the satellite image see figure 4 and 5. Higher NDVI in both
research years occurred in forest and Rawa Danau preserve as well as in private garden land.
Higher NDVI classes are Class 4 and higher. The LAI of higher NDVI classes were in forest LAI
range.