Agriculture Reference
In-Depth Information
species, and number of trees served as the independent variables (
x
1
,
x
2
,
x
3
, …,
x
i
).
The four Multiple Regression equations used are:
1. Number of fruit species (y) = Constant
+
Dudukuhan size (x
1
)
+
Tree density (x
2
)
+
Basal area (x
3
)
+
Elevation (x
4
)
+
Number of timber species (x
5
)
2. Number of timber species (y) = Constant
+
Dudukuhan size (x
1
)
+
Tree density
(x
2
)
+
Basal area (x
3
)
+
Elevation (x
4
)
+
Number of fruit species (x
5
)
3. Number of fruit trees (y) = Constant
+
Dudukuhan size (x
1
)
+
Tree density (x
2
)
+
Basal area (x
3
)
+
Elevation (x
4
)
+
Number of timber trees (x
5
)
4. Number of timber species (y) = Constant
+
Dudukuhan size (x
1
)
+
Tree density
(x
2
)
+
Basal area (x
3
)
+
Elevation (x
4
)
+
Number of fruit trees (x
5
)
4.2.3
Farmers' Perceptions Regarding Tree Selection and Uses
Focal group discussions (
FGDs
) were used to collect information regarding farm-
ers' perceptions on tree species selection and use. Discussions considered three
variables tree profiles, their landscapes position, and their socioeconomic value.
Respondents were asked to identify and rank relevant sub-variables as: less impor-
tant (1), quite important (2), important (3) or very important (4).
4.2.4
Management of Dudukuhans
Dudukuhan management - including inputs, outputs and financial returns - were
documented through a separate farm and household economic study of dudukuhan
owners (Budidarsono et al. 2004). In the study 35 households were purposively
selected and interviewed in each of the sample villages.
4.3 Results
4.3.1
Tree Diversity and Dudukuhan Profiles
The size of dudukuhans reported by landowners varied between 0.054 and 0.377 ha
(Budidarsono et al. 2004). A total of 52 tree species were identified as components
of dudukuhan systems. These include 26 fruit species and 26 timber species; with
fruit species include those that produce vegetables, spices, medicines, and or other
food condiments (they may have other primary wood or non-wood uses). Tree spe-
cies diversity (H' index) in dudukuhan systems by village (watershed location) is:
Cisarua (1.02), Curug Bitung (0.97), and Parakan Muncang (1.19). Statistically,
there is no difference tree diversity between the villages.
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