Efficiency of planting stock and thinning to havesting time of M. leucadendra plantation for sawlog in Thanh Hoa district, Long An province
Keywords:
Melaleuca leucadendra, thinning, forecasting, acid sulphate soil, Long An provinceAbstract
“Research on efficiency of planting stock and thinning to havesting time of
Melaleuca leucadendra plantation in Thanh Hoa District, Long An
Province” belong to scientific research topic on the technical measures for
intensive planting of M. leucadendra providing the large wood establish at
Thanh Hoa Forestry Experiment Station in 2014. The objective of this
study was finding the best method from all experimental treatments for
planting and thinning trees appropriate with the purpose to product large
wood. Field experiment consisted of nine treatments that planting and thinning (With the density 2 × 2 m inclusion T0 - not thinning; the density
1 × 2 m inclusion: T1 not thinning; T2 thinning 50% at 24 months; the
density 1m × 1m inclusion: T3 not thinning; T4 thinning 25% at 24 months
and T5 thinning 25% at 24 months and 25% at 36 months and the density
0.5 × 1 m inclusion: T6 not thinning; T7 thinning 50% at 24 months and T8
thinning 50% at 24 months and 12.5% at 36 months). The experimental
treatments designed in The Randomized Complete Block Design (RCBD)
method with three replications. The area of each experimental plot is 100
m
2
. Results of the experiment indicated that M. leucadendra in the age of
4.7 years has significantly different in diameter growth between
experimental treatments (P < 0.05). The treatment T5 has the tree diameter
get 9.0 cm, higher than 2.0 cm compare with the tree diameter in treatment
T3 not thinning is 7 cm; significantly different in heigh growth between
experimental treatments (P < 0.05). The treatments T1, T2, T5 và T8 have
the best average height compare with other treatments and they get around
9.3 m. Comparison for the productivity and quality, the treatments T1, T5
were prospective with producing the large wood. In which, the best
experimental treatment is T5 with the very good indicates including DBH ≈
9.0 cm; Hvn ≈ 9.3 m; MAI ≈ 25.0 m
3
/year/ha and the trees have good
quality get around 96.0%, the second is T1 have DBH ≈ 8.6 cm; Hvn ≈ 9.3
m; MAI ≈ 24.3 m
3
/year/ha and the trees have good quality get around 80%.
The result of the prediction for harvesting age of Melaleuca leucadendra
plantation supply of large timber (DBH ≥ 16 cm) consist of treatment T1 is
12.5 years old and treatment T5 is 11.3 years old
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