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
The composition and diversity of native tree species in all topographical positions
of Dud-Pukuria Natural Forest in Chittagong (South) Forest Division, Bangladesh were
investigated. A total of 667 individual stems having dbh >10 cm were recorded from 3.2
hectare sampled area. These 77 native tree species belongs to 32 family and 53 genera
This paper presents some indigenous or traditional technical knowledge on jhum
(shifting cultivation) cultivation and management in Bandarban hill district in
Bangladesh. These include indicators for jhum land selection, fire management in jhum
field, three- phase seed sowing technique in jhum, use of colored flower plants to keep
away insects from jhum, slope differentiation of hills in crop selection, use of local
climate for crop selection, altitude and wind velocity in crop selection, indigenous seed
collection and germplasms management, indigenous seed storage method, seed
distribution, indigenous nursery method for raisings citrus seedlings, and indigenous
ginger storage method by the Bwam community in Bandarban hill district of
Bangladesh. Three-phase seed sowing technique in jhiim is the new documentation of
indigenous knowledge. An integration of indigenous and scientific knowledge will
help to develop sustainable management of indigenous farming practices.
Insecticidal activity of ivermectin (Ivecop- 12), a derivative of ivermectin B,
produced by a soil actinomycete, Streptomyces avermitilis, was evaluated in laboratory
against the larvae of bamboo leaf roller, Crypsiptya coclesalis Walker (Lepidoptera:
Pyralidae), a major defoliator of bamboos in nurseries, plantations and natural forests.
The study was
doses. Results revealed that ivermectin is
conducted with eight treatment concentrations of lethal and sub-lethal
highly toxic and induce larval mortality
when applied separately on host plant leaves and larvae, on leaves and larvae of the
insect pest together and leaf rolls containing larvae. The nature of treatment affects the
larval mortality. On the basis of two trials, results revealed that treatment of leaves and
larvae together showed cent percent larval mortality by the 0.15% concentration,
whereas treatment of leaves alone and leaf roll exhibited cent percent mortality by the
concentration of 0.3%. Larval treatment showed hundred percent mortality by 1.2%
concentration. The LC50 value of the tested product was worked out to be 0.012239,
0.076789, 0.010833 and 0.051116% for leaf and larval treatments separately, leaf and
larval treatments together and leaf roll treatment respectively against the insect pest.
This clearly shows that ivermectin is more
through food
The response of rajkoroi (Albizia richardiana King and Prain) wood for making
pulp in NS-AQ (Neutral Sulphite Anthraquinone), soda, soda-AQ and kraft pulping
processes was assessed by different alkali doses and pulping time. The temperature
was maintained at 170°C in all cases. Results showed that the species was not suitable
for making pulp in NS-AQ process. Pulps could be made in soda process but the
amount of uncooked material (rejects) was high. Addition of 0.1% AQ in soda liquor
gave better results in delignification. The species responded very well towards kraft
process. Bleachable grade kraft pulp was obtained even with 14% active alkali with a
pulp yield of 48.2%. The pulp yield of rajkoroi was
species widely used in pulp and paper mills of Bangladesh.
Hand sheets from soda, soda-AQ and kraft pulp of rajkoroi were made. The
physical strength properties likely tear, tensile and burst were evaluated. Kraft pulp
was superior to the pulp produced either in soda and soda-AQ processes but slightly
inferior to the pulp produced from commonly used hardwood species. The pulp of this
species could be blended with imported softwood pulp for making moderate quality
writing, printing and wrapping paper
In this paper the anatomical properties and extractive content of four traditionally
used wood species, viz. itchri (Anogeisus acuminata Wall.), kochoi (Bridelia retusa
Spreng.), sil-bhadi (Garuga pinnatn Roxb.), and goda (Vitex pedunciilarlis Wall.), of
Bandarban Hill District in Bangladesh have been studied. All the wood species under
the study have tyloses with narrow lumens. The extractive content of the sapwood of
the species varies from 4.16 to 6.89 percent in cold water. The highest percentage was
in itchri (6.89%) followed by goda (6.65%) and 5.9% in kochoi and lowest in sil-bhadi.
The hot water extractive content varies from 6.88 to 8.76 percent with highest percent in
itchri (8.76) followed by sil-bhadi (8.08), goda (8.02) and 6.88 in kochoi. The heartwood
extractives in cold water were 7.21% in goda followed by 7.12, 6.43 and 6.15% in itchri,
kochoi and sil-bhadi respectively. The hot water extractive content was higher in itchri
(9.84%), followed by 8.97% in sil-bhadi, 8.7% in goda and 7.75% in kochoi. Both
anatomical properties and extractives contents are
durability of these species
A comparative growth study of Avicennia officinalis, A. alba and A. marina along
the eastern shorelines of Bangladesh showed an average annual diameter increments of
0.99, 0.90 and 0.97 cm respectively for plantations varying 11 and 16 years age. Average
annual height increments of these species were 0.31, 0.37 and 0.31 m respectively.
Annual volume production per tree was 0.025, 0.025 and 0.024 m3 respectively. All the
individuals of Avicennia species had a promising growth and the plantation was
successful along the eastern coast of the country. On the contrary much human
interference was observed on the established plantations. The growth of Avicennia
officinalis, A. alba and A. marina showed that plantation areas and newly accreted lands
may be suitable for planting with Avicennia species.
A study was conducted from 1997 to 2000 to determine the effect offelling top dying
affected sundari (Heritiera fames’) trees on the regeneration status in those areas of the
Sundarban. The newly recruited seedlings ofsundari (H.fames), gewa (Excoecaria agallocha)
and kankra (Bruguiera sexangula) were significantly higher in the felled areas compared to
unfelled areas almost all the years. But seedlings of passur (Xylocarpus mekongensis) and
goran (Ceriops decandra) were found significantly higher only in 1997 and 2000 respectively
and amur (Amoora cucullata) in 1997 and 1998 in the felled areas. Moreover, seedlings
recruitment of all species together was significantly higher in the felled areas. Among the
recruited seedlings, H. fames and E. agallocha constituted the highest numbers both in the
felled and unfelled areas. Therefore, salvage felling of the top dying affected sundari trees is
recommended to avoid wastage of wood and to improve regeneration status
Nine types ofMentha belonging to the six species were studied for their growth,
yield, oil content and composition of the oils. The highest plant height (34.6 cm.), herbage
yield (1.0 Kg/m2) were obtained in M. citrata and oil content (1.3%) was obtained in M.
arvensis (Sivalika). The varieties M. arvensis (Sivalika), M. arvensis (CIMAP) and local ofM.
arvensis contain menthol and isomenthone (77.0% and 11.0%), menthol and menthone (72.2%
and 12.1%) and carvone and limonene (59.6% and 31.1%) respectively as major constituents.
M. piperita contain menthyl acetate (29.8%), menthol (22.6%), menthofuranone (16.4%) and
isomenthone (8.4%) as major constituents. Major constituents of M. citrata were linalool
(41.8%) and linalyl acetate (31.3%). Local varieties of M. spicata contain carvone (55.0%),
dihydrocarveol (17.9%), dihydrocarveol acetate (7.7%) and limonene (6.9%) and the exotic
type contain carvone (73.3%) and D-limonene (7.6%) asmajor constituents. M. cardiaca contain
as major constituents carvone (61.0%) and limonene (21.6%). M. aquatica contains a complex
mixture of ledol (13.5%), menthofuranone (9.4%), neryl acetate (7.6%), caryophyllene (6.8%),
caryophyllene oxide (5.8%) and mintfuranone (5.0%) as major constituents.
Keora {Sonneratia apetala Buch.-Ham.) is a
pioneer species in coastal areas of Bangladesh
(Siddiqi 2001). It alone constitutes 94.4% of the
existing mangrove plantations (Siddiqi and
Shahjalal 1997) because of its high survival and
growth in the newly accreted land. However, the
information on flowering, fruiting and seed
collection are very little. There was no systematic
study in this context. So, for a clear understanding
about the phenology of keora a study over a period
of 12 monthsfrom January to December 1996 was
conducted in the coastal plantation ofKattoli under
Chittagong Coastal Afforestation Division.
The in vitro regeneration of Passion fruit (Passiflora edulis L.) was obtained from
cotyledon derived callus and adventitious buds. The callus was initiated in the MS basal
medium supplementedwith different concentrations of plant growth regulators viz, BAP,
KIN, NAA, IAA, and GA3 alone or in combination. Among the different plant growth
regulatorsupplements, 0.2 mg/1 NAA was proved to be more effective in inducing callus
than adventitious bud regeneration. Adventitious bud regeneration was achieved through
organogenesis of callusinMS culturemedium supplementedwithBAP or KIN in combination
withNAA orIAA .The media having 2.0 mg/1BAP+0.2 mg/1 NAA was found to be the best
for adventitious bud regeneration (75%). For shoot regeneration via callus plant growth
regulator cytokinines (BAP & KIN) were supplemented alone orin combination with auxins
(NAA) in MS medium. On the other hand, when BAP or KIN was tried alone, no shoot
regeneration was observed via callus. Among the different combinations of auxins (NAA)
and cytokinines (BAP and KIN) plant growth regulators, 4 mg/1 BAP+0.2 NAA wasfound to
be the bestfor regeneration via callus. Regenerated shoots were rooted in fullstrength MS
medium. IBA (7.0mg/1) effectivelyproduced higher percentage (90%) ofroots and root growth.
Aftersequential hardening, the regenerated plantlets were successfully established in soil
under natural environment.
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