Silviculture treatments and age on growth and wood properties of naturally regenerated Acacia mangium Willd. in Kemasul Forest Reserve, Pahang, Malaysia
High planting cost and labor shortages was the main problem in new plantation establishment. Natural regeneration is an attractive method for establishment of second rotation Acacia mangium stand. However, the management procedure of this stand needs to be established to avoid risk of using inap...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2013
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/91438/1/FH%202013%203%20-%20IR.pdf |
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| Summary: | High planting cost and labor shortages was the main problem in new
plantation establishment. Natural regeneration is an attractive method for
establishment of second rotation Acacia mangium stand. However, the
management procedure of this stand needs to be established to avoid risk of
using inappropriate silvicultural strategies. The objective of this study is to
determine the best timing for first thinning, to study the effect of stand
density and to determine the wood specific gravity of four and five year old
stand after one year of the first thinning. This study was conducted in two -
four years old naturally regenerated A. mangium stands at Kemasul Forest
Reserve, Pahang. The trial consists of three replicates and twelve
treatments of 0.09 ha (30 x 30 m) plots aged two, three and four years. The
total number of plots: 36 and total research area covers 3.24 ha. Selective
. low thinning concepts with the retention of most vigorous individual trees
were used for crop trees selection although it was selected as evenly spaced
as possible. Mean annual diameter at breast height (DBH) increment for
thinning at age three (3.1 cm year") shows significantly higher differences (p<O.OS) compared to thinning at age two (2.4 cm year") and four (2.9 cm
year") years. DSH increment for 600 stems ha" was significantly larger at
3.8 cm year", Mean height increment however, does not shows significant
difference between thinning treatments. Thinning the naturally regenerated
A. mangium stand at age three also shows significantly larger basal area
(0.06 m2 tree") and volume (0.07 m3 tree") increments between aU age
classes. Periodic annual increment (PAl) data from stand and stock tables
shows that plot TS produces greatest DSH (4.8 cm) and basal area (3.4 m2
ha-1
) increments. Largest periodic annual volume increment (PAlv) was from
T7; (42.5 m3 ha"). Mean increment of wood specific gravity (SG) from pith to
bark was 31%. The variation in the mean SG value however, was not
significant at p<0.0001 between the different stand age, thinning treatments
and the interaction of both age and thinning treatment. To create uniform
regenerated stands and to avoid root diseases, establishment work which
includes stacking and burning is proposed. In areas with low regeneration rates,
direct sowing and refilling can also be practice. Thinning treatment in the
naturally regenerated A. mangium stand should be done at age three years.
Preliminary growth, yield and wood properties result from this trial would
help researchers to identify processes that control productivity and future
prediction of timing for the final harvest. |
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