47
4.3.7 Peat depth Map
As mention before, peat depth map is obtained by interpolating peat depth in research area. Based on interpolating result, we obtain that peat depth in
research area are variated between 0 up to 12 meter. Based on characteristic of peatdepth itself, which is peat depth more than three meter are not suitable for
plantation, it must be conserve. This is aimed for not collide Presidential
Instruction No. 2 Year 2007 which is regulated about acceleration of rehabilitation and revitalization peatland development zone in Central Kalimantan.
For further analysis, this peat depth range are reclassify according to Hardjowigeno criteria in
determine the land suitability map for paddy field. For more details, peath depth
map are show on Figure 13. From above figure, we can see that peat having depth
value less than 3 meter are spread along Zone A and D precisely can be seen on
this following table Table 8 Table 8
Land Suitability Based on Peat Depth Factor and Their Spread in Research Area
No Peat Depth
Total Ha Percentage
Suitability Class
1 Peat 0,5 – 1 m
81.094,20 13,34
S2 2
Peat 1 – 2 m 39.641,37
6,52 S3
3 Peat 2 – 3 m
28.759,64 4,73
N1 4
Peat 3 m 151.721,23
24,96 N2 5
Mineral Soil 306.589,60
50,44 S1
Total 607.806,04 100.00
Source : Figure 4.9
Based on landform and landsystem data, we can determine decomposition of peat in research area. It is divided into three categories. There are Fibrist,
Hemist and Saprist. Where fibrist is peat with early corrosion and more than ¾ of its volume is fresh fiber immature, while hemist is a kind of peat having medium
48 corrosion, half of its volume had weathered and the others half is fiber half
mature. And Saprist is peat decomposition have already weathered mature.
Figure 13. Peat depth Map in Research Area
4.3.8 Overlay Process Analysis
Spatial analysis in this study is overlaying the spatial data based on criteria. Those criteria are taken from literatures. In this research we use weighting
method to identify the land suitability using parameters which already mention before such as ground deppness, land texture, land fertility, pH, phyrit deepness,
salinity, peat decomposition, drainage and flood which is found in soil map, slope
49 and elevation parameter obtained from Bakosurtanal and derivation from DEM
SRTM, peat depth parameters taken from Bappeda Central Kalimantan Province. Each of parameter has criteria to determine where is the suitable area for paddy
field and where is the area are not suitable to develop paddy field in research area. According to Harjowigeno’s criteria have mentioned in chapter II, we can
determined the suitability area which is divided into 5 suitability class High Suitable S1, Moderate Suitable S2, Suitable S3 , Less Suitable N1 , and Not
Suitable N2. As the result, almost all of research area are not suitable for paddy field development 605.538,61 ha, and only small area are suitable to develop as
paddy field area 2.267,43 ha. The suitable area which have only has a tiny part of research study are spread along the river and tidal area. It has been proved from
the result that peatland area are not suitable for paddy field as almost people had argued. For more detail about suitability map as the result of this overlay process
can be seen on following figure See Figure 14
4.3.9 Suitability and Availability Land for Paddy Field
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