Agriculture Reference
In-Depth Information
hedgerows, reduction of light capture near zero occurs at canopy with of about 5 m
(Fig. 6.11). Due to much wider spacing of fruit trees (5 × 5 and 10 × 10), reduction
in light capture of
Imperata
takes place at much greater canopy width. When grown
under
L. domesticum
, canopy width of 5.0 and 8.0 m for 5 × 5 and 10 × 0 spacing,
respectively, reduced light capture by growing
Imperata
underneath the trees to
zero. Under
M. indica
hedgerows, canopy widths of 4.0 and 7.0 m at closer and
wider spacing are needed to reduce light capture of
Imperata
to near zero (Fig.
6.11). Light captured by
Imperata
was greatly reduced with increase in canopy
width of the different tree species (Table 6.6).
Eucalyptus deglupta
1.0
Gmelina arborea
1.0
0.9
0.9
0.8
0.8
1x3
1x9
0.7
0.7
1x3
1x9
0.6
0.6
0.5
0.5
0.4
0.4
0.3
0.3
0.2
0.2
0.1
0.1
0.0
0.0
0.0
0.5
1.0
1.5
2.0
2.5
0.0
2.0
4.0
6.0
Canopy Width
Canopy Width
Mangifera indica
Lansium domesticum
1.0
1.0
0.9
0.9
0.8
0.8
5x5
10x10
0.7
0.7
5x5
10x10
0.6
0.6
0.5
0.5
0.4
0.4
0.3
0.3
0.2
0.2
0.1
0.1
0.0
0.0
0.0
2.0
4.0
6.0
8.0
10.0
0.0
2.0
4.0
6.0
8.0
10.0
Canopy Width
Canopy Width
Fig. 6.11
Simulated relative light captured by
Imperata
as a function of the canopy width of
timber and non-timber trees
Table 6.6
Regression of the simulated relative light captured by
Imperata
as a function of canopy
width of timber and non-timber trees
Tree species
Spacing (m × m)
Equation
R
2
Eucalyptus deglupta
1 × 3
y = −1.16Ln(x) + 1.26
0.86
1 × 9
y = −0.50Ln(x) + 0.76
0.74
Gmelina arborea
1 × 3
y = −0.66Ln(x) + 0.12
0.93
1 × 9
y = −0.52Ln(x) + 0.26
0.92
Mangifera indica
5 × 5
y = −0.95Ln(x) + 1.52
0.88
10 × 10
y = −0.70Ln(x) + 1.49
0.82
Lansium domesticum
5 × 5
y = −0.46Ln(x) + 0.70
0.84
10 × 10
y = −0.35Ln(x) + 0.71
0.84
Search WWH ::
Custom Search