BANGLADESH JOURNAL OF FOREST SCIENCE
A Half-yearly Peer Reviewed Journal of Bangladesh Forest Research Institute
A Half-yearly Peer Reviewed Journal of Bangladesh Forest Research Institute
Teli garjan (Dipterocarpus turbinatus), dhakijam (Sygyzium grande) and teak (Tectona
grandis) are the three most important timber species included in the plantation
programme in Bangladesh. Sometimes, trees are being removed without recording
the diameter at breast height (dbh) and total height. As such it is not possible to
estimate the volumes of the removed trees. But, it is necessary to have an estimate of
volumes of the removed trees for different purposes. The stump diameters can be
measured while the stumps are still there after removal of the trees. Therefore, stump
diameter and dbh relationships have been established in the present paper so that we
can estimate the dbh of removed trees first followed by estimation of the volumes
using the.dbh volume relationships. It was identified that some mistakes were done
in converting the previously selected imperial volume equations to metric units for the
species teli garjan and dhakijam. These equations and tables have also been corrected.
The growth and biomass production of 17 provenances of Acacia mangium were
studied at the age of 5.5 years at Keochia Silvicultural Research Station, Chittagong.
The provenances showed significant differences in survival, height and diameter
(dbh) growth. In terms of height and dbh, Boite PNG provenance has shown the best
performance among the 17 provenances. But the provenance Iron Range QLD,
produced maximum (15.7 t/ha/yr) above-ground oven-dry biomass followed by
NW of Ingham QLD (11.8 t/ha/yr).
This study was conducted to examine the effects of post-severance treatments
like leaf area of cuttings and auxin treatment on rooting of cuttings and growth of
rooted cuttings. One or two-node cuttings of sissoo, Dalbergia sissoo Roxb. with 20 or
50% leaf area were collected from managed stock plants and rooted in a non-mist
propagator following treatment with 0 or 0.2% indole-3 – butyric acid (IBA) solution.
The rooted cuttings were transferred to polythene pots and grown in a nursery for 10
weeks. Rooting percentages of cuttings were not significantly influenced by IBA
treatment or cutting size, but were significantly enhanced with the increased leaf area.
Effects of leaf area and IBA on root development of cuttings in the propagator were
manifested on the grow th of stecklings in the nursery. The increased leaf area and IBA
treatment significantly enhanced the growth of stecklings. Cuttings with 50% leaf
area plus 0.2% IBA was the best treatment to produce the best performing stecklings
Teak (Tectona grandis Linn, f) is one of the most
well-known versatile timbers in the world. Its
large scale cultivation is much hampered by various
factors. Among them poor germination of
drupes (fruit with seed) is a major constraint. The
causes of poor germination are many such as
emptiness, prolonged and protracted germination,
season and method of seed collection, age of
mother tree and innate problems prevailing in the
seed itself (Dharmalingam 1995). Several informations
exist on method and season of seed collection
of many tree species. But such informations
are scanty in teak. Against this backdrop, a study
was made to find out the influence of collection
methods on germination and seedling attributes
of teak.
The paper presents the micromorphological features of culm epidermis of 26
bamboo species occurring in Bangladesh. Different attributes of long cells, silica
bodies, cork cells, stomata, papillae and dermal appendages are provided in a table.
The study reveals that these micromorphological characters have taxonomic value at
species level. But due to homogeneity any delimitation cannot be defined at
supraspecific level.
The paper also provides an identification key to 26 bamboo species occurring in
Bangladesh, based on culm epidermal characters.
An attempt was made to isolate and study the cellulolytic microorganisms from
the soil under two deciduous (Tcctona grandis L. f. and Lagerstroeinia speciosa L.) and
two evergreen (Eucalyptus camaldulensis Dehnh. and Acacia auricul’iformis A. Cunn.
ex Benth.) forest plantations, and the relation of these organisms with the soil
nutrient of the forest (N, P, K and carbon) has been observed. Among the isolates,
finally selected 11 isolates comprised of one bacterial strain (Cellulonionas sp.), five
strains of Streptomyces and five fungalstrains (Aspergill usflavus, A. nigcr,A.ochraceous,
Trichodernia lignorum, T. glaucum). Cellulolytic activity of these strains has been
reported.
Termite is one of the major problems of forestry, specially in the tropics. Losses in the
forest nurseries and plantations due to termite damage can be substantial. Damage by
Coptotermes, Odontoternies, Microcerotermes, Microtermes and Macrotermes have been found to
be serious. This paper describes damages caused by these termites and suggests measures
for their management. Various alternative strategies for their management have also been
reviewed and discussed.
Provenances of mangium (Acacia mangium Willd.) from Queensland (Australia),
Papua New Guinea and Indonesia were planted under three site conditions
of Ilocos Norte, Masbate and Bukidnon regions in the Philippines which are
edaphically, climatically and topographically different from each other.
Highly significant (P<0.01) variations in diameter, height and merchantable
height growth performances of 18 provenances at Ilocos Norte, 12 provenances at
Masbate and 12 provenances at Bukidnon at5.5 years after planting were observed.
The best growth was observed in Bukidnon site, and the provenance 13240
(Ellerbeck Rd. Qld.) of the species exhibited the best growth performance at that site
which could be selected for pilot plantation trials in the Philippines.
The paper presents the method of raising seedlings of Calamus viminalis var.
fasciculatus and their performance after planting out. Germination per cent of C. viminalis
was 24.37. Sunlight was pre-requisite for the germination. Optimum time for seedling
pricking from the seed bed to the polybag was 90 days after germination, and in this 100%
survival could be obtained. A survival of 98% was observed in the wildings when they
were transferred from the field to the polybags at an average height of 8.5 cm. One year
old wildings were significantly lower in height in the nursery than that of one year old
polybag-raised seedlings. Survival of planted seedlings at Hinguli, Chittagong in the
field was 77.5% after one year. Average height increment of the seedlings was 25.5 cm
with usually 4-5 leaves one year following planting under a teak plantation.
Seedlings of Bambusa tidda Roxb. and Dendrocalamus strict us Nees were grown in the
nursery under four different light conditions, viz. sunlight, partial sunlight, shade, and
6 hours photoperiod up to nine months of age. Almost all the seedlings were dead (80 to
90%) under shade and 6-hr grolux electric light photoperiod conditions after 200 -270
days. Survival was highest (80-95%) under both sunlight and partial sunlight condition.
The seedlings were comparatively healthy, green and tall under partial sunlight. Under
these two light conditions seedings started clump formation within three months of age.
The clump formation was delayed and a very few bamboo seedlings formed weak clumps
under shade and 6 hours photoperiod conditons.
Welcome to the Bangladesh Journal of Forest Science (BJFS) – a leading platform for advancing the knowledge and understanding of forest science in Bangladesh and beyond. Established with a commitment to excellence, BJFS serves as a cornerstone for researchers, practitioners, and enthusiasts dedicated to the sustainable management and conservation of forest ecosystems.
