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BANGLADESH JOURNAL OF FOREST SCIENCE

A Half-yearly Peer Reviewed Journal of Bangladesh Forest Research Institute

ISSN - Print: 1021-3279 | Online: -
Abstract:

A study was conducted from 1998 to 2001 in the Sundarban mangrove forests of
Bangladesh covering three salinity zones to determine the effect of deer (Axis axis) on the
newly recruited seedlings of sundari (Heritiera fames), gewa (Excoecaria agallocha), kankra
(Bruguiera sexangula), passur (Xylocarpus mekongensis), baen (Avicennia officinalis), goran
(Ceriops decandra) and amur(Amoora cucullata) in the fenced and unfenced plots. Tire browsing
effect of deer wasfound to vary from species to species because of differences in palatability.
A significant damage of deer was found in the regenerated seedlings of B. sexangula,
X. mekongensis, A. officinalis and H.fames. No significant effect was found for E. agallocha,
C. decandra and A. cucullata

Abstract:

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.

Abstract:

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.

Abstract:

The paper reviews information on climate changes, status of forests, biodiversity
and vulnerability of biological resources in Bangladesh particularly in mangrove areas.
The atmospheric concentration of green house gases modifies the global and regional climates
and consequently affects adversely the environment of Bangladesh. There may be an increase in
temperature, rainfall and frequency of cyclones, and sea level rise in the coast ofBangladesh.
The country is likely to experience repeated flooding, cyclones, tidal surges, soil erosion,
heavy sedimentation,salinity increase and prolonged drought.
The forest covers 17% of the total area of Bangladesh but only 7.7% are under
closed tree cover. With regard to biodiversity, the plant kingdom supports about 5,000
angiospermic species including 10% trees, 35% shrubs and woody climbers and 50% herbs.
The mangrovesinclude 70 species of plant. About animals, the mammals comprise 50 species,
birds 275, reptiles 50 and amphibians 8 species compared to 110 species of mammals, 628
birds, 109 reptiles and 22 amphibians in the entire Bangladesh. Considerable number of
plant and animal species is threatened with disappearance due to human pressure, and the
situation will aggravate with changing climate. Extinction or migration ofspecialized plants
and animals will take place with regular flooding, increasing soilsalinity and other ecological
changes. Probable impact of sea level rise in the coastal areas on forests and biodiversity is
unknown. For living organisms, it may be possible to overcome small and gradualsea level
rise but will disappear in case of abrupt change.

Abstract:

The paper reviews information on climate changes, status of forests, biodiversity
and vulnerability of biological resources in Bangladesh particularly in mangrove areas.
Atmospheric concentration of green house gases modifies the global and regional climates
and consequently affects adversely the environment ofBangladesh. There may be increase in
temperature, rainfall and frequency of cyclones, and sea level rise in the coast ofBangladesh.
The country is likely to experience repeated flooding, cyclones, tidal surges, soil erosion,
heavy sedimentation,salinity increase and prolonged drought

Abstract:

The responses offour provenances ofAcacia nilotica to salinity (0,75,150, and 225
mMNaCl) at the germination stagewere examined experimentally and compared with their
known salt tolerance at the seedling stage. There were significant differences in final
germination percentage and germination rate between salinity treatments and between
provenances. The provenance (Tunzini, Swaziland) which appeared more salt tolerant
during germinationwas notmost tolerant at the seedling stage.

Abstract:

A study was conducted on the socio-economic upliftment ofthe rural poor women
in Pomra Community Forestry Project (CFP) ofRangunia, Chittagong compared to those in
the adjacent Non-CFP areas. Thirty sample families from each group reveal that the women
populations are same (45%) in both the areas. Women who can read and write in the CFP
and Non-CFP areas have been found to be 66% and 37% respectively. About 29% and 35%
female workforce have been found in these two areas with 1.7 and 2.1 women per family. It
has been found that 53% and 20% women are conscious about health while 70% and 53%
women found to be liberal to talk or meet visitors orstrangersin the CFP and Non-CFP areas
respectively. The average annual income per family have been found to be Tk. 20,640/- in
CFP and Tk. 3,608/-in Non-CFP areas where the contribution of female workforce are
Tk. 8,997/- and Tk. 1,647/- respectively.

Abstract:

The Sundarban, the largestsingle tract ofmangrove forest in the world, is famousfor
its economically and ecologically important flora and fauna. The Sundarban ofBangladesh
is the main natural home of the giant honeybee, Apis dorsata Fabr. (Apidae : Hymenoptera).
Thebee gives honey and wax contributing to fetch handsome revenue to the national economy
and supports the livelihood of a group of resource-poor honey hunters, locally known as
‘mowalis or mowals’, living in the vicinity of the Sundarban. This paper presents author’s
observations and reviews on scientific and practical aspects of the bee, its nectarsource and
age-old honey hunting in the Sundarban. It also analyzes the constraints and prospects
with suggestions for better management of the resource based on ecological consequences
and socio-economic conditions of the people living in the adjoining areas. The paper,
highlighting the value of the bee to environment and society as a whole, is expected to be
useful to the scientists, extension workers, policy makers, planners, forest managers and aid
agencies.

Abstract:

The study was undertaken to ascertain the growth performance of akashmoni
{Acacia auriculiformis) in the strip and block plantations ofBangladesh. Growth statisticslike
mean diameter at breast height (DBH), totalheight (Ht), volume over bark (Vob), basal area per
hectare per year (ba/ha/yr) and mean annual increment (MAI) were estimated using the
data collected from 6 to 10 years old plantations. The results showed that the growth
performance of the species was better in strip plantations compared to block plantations.
A financial analysis also favoured strip plantations over block plantations.

Abstract:

Essential oil constituents of Eucalyptus camaldulensis and E. tereticomis were studied
for their comparison. Essential oil of E. tereticomis, contains 46 compounds of which
1,8-cineole (39.7%) is the major constituents followed by terpinyl citronellol (7.9%),
cyclohexanol (7.8%) and thujene (6.1%). The essential oil of E. camaldulensis contains 27
compounds containing p-cymene (34.0%) and a-phellandrene (23.0%) as major constituents
followed by 1,8-cineole (7.3%) and a-pinene (6.5%).

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