A Half-yearly Peer Reviewed Journal of Bangladesh Forest Research Institute
Bangladesh is blessed with 119 species
of mammals (Khan 1982). The abundance
of such a large number of species in a
small territory has been possible because
of a diversified flora, a characteristic of
tropical forests. However, the existing
mammalian population indicates a distinctly
deteriorating trend during the past
several decades. No systematic survey of
mammals has ever been carried out for the
area now under the territories of Bangladesh.
It is, therefore, difficult to quantify the
magnitude of loss. Our knowledge is
limited to some old records made by
Blanford (1888) and Pocock 1939, 1941) and
some recent works (Choudhury 1969,
Mountfort 1969, Husain 1974, Khan 1982).
None of these records is complete and
uptodate and, therefore, further studies are
needed in this direction. A reconnaissance
survey was made during 1978 and 1979 to
assess the status and distribution of some
mammals of Bangladesh. This paper
discussess the status and distribution of 21
species covering 8 families.
Coconut palm ( Cocos nucifera) is one
of the most important economic trees in
the tropica] countries. Coconut is planted
on a large scale along the coastal belt of
Bangladesh, particularly, in the districts of
Noakhali, Patuakhali, Barisal and Khulna.
According to the national survey of 1980-81,
there are about 23.4 million mature and
immature Coconut trees in the village
groves ( Anon. J 982 ), Many of these trees
will be overmature in the next few years
and will cross the prime age for the profitable
production of nuts. These trees will need
replacement by newer and more productive
varieties. This necessitates proper
utilization of overmature Coconut stems in
order to make the felling and replanting
operations economically viable. This will
Exploration and exploitation of natural
resources is a very important activity for
the continued economic growth of the
society. Many devices at different stages
of human civilisation were introduced for
the exploration of natural resources. In
the modern age Remote Sensing Technique
is one of the best tools for surveying natural
resources particularly in the inaccessible
areas. Modern remote sensing system from
space is the result of the development
process which began in the U. S. A. in the
mid sixties. This led to the Earth Resources
Technology Satellite ( ERTS) project
of NASA in 1970, now called LANDSAT.
Experiments to determine the rok of
wounding alone and fungal infestation in
the formation of the aromatic base, agar,
in the wood of Agar tree (Aquilaria agallocha
Roxb.) were started in two Agar plantations
at Lawachara near Srimangal in
1977. Results of the first assessment of
nine trees after two years indicated that
the formation of agar did not depend on
the activity of a particular fungus, as was
previously believed, but is a general reaction
of the host to injury and invasion by
various microbes. It was, therefore, suggested
that the effect of wounding on the
Sal seeds generally mature between the
months of April and May. It may vary
according to location. The seeds fall as
soon as they mature. The germination of
seed starts soon after maturity and it may
germinate even on the tree (Troup 1921).
When germination starts, the tip (apex)
of the fruits splits longitudinally (at right
angle to the pedicel of the seed) and the
radicle emerges from the apex of the seed.
Germination percentage is influenced
by various factors. Cockburn and Wong
(1969) stated that germination percentage
of Sal depended on the size of seed trees
and collection of seeds from the tree rather
than from ground. Troup (1921) reported
that sound fresh seed had a high germinative
capacity. Sal seed, however, rapidly
loses its viability. Depth of sowing is
also an important factor in germination.
Cayford and Waldron (1969) found
that germination depended on sowing
methods and depth of sowing. Defective
sowing of Sal seed in nursery in India
had led to low germination percentage
(Singh et al. 1975). The present investigation
was, thus, undertaken to determine the
effect of sowing orientation of seed on
germination.
Pestalotia sp., a fungal pathogen causing leaf blight disease of
pony al ( Calophylum enophylum Linn.), was isolated. The finding
was confirmed by the artificial inoculation of healthy leaves ofpanyai
plants with the isolated pathogen. Besides, the average quantitative
incidence and infection index of the disease on naturally infected
plants during 1976-1978 were estimated.
Usefulness of volume table for teak (Tectona grandis) aan hardly
be overemphasized. The paper deals with the preparation of a commercial
volume table of teak based on data collected during 1977 from
1874, 1875, 1876, 1878 and 1879 plantations at Kaptai in the
Chittagong Hill Tracts (South) Forest Division in Bangladesh. Thirteen
mathematical models of tree volume on diameter at breast height
( D B H ) and volume on D B H and total height were compared. The
best relationships judged principally by Furnival’s Index were used to
compute volume tables.
This paper focuses on some basic issues of agroforcstry systems of the
world, in general, and of Bangladesh, in particular. The importance and
existing system of agroforcstry have been critically examined based on which
the future strategy has been suggested. It has been found that agroforcstry has
an impact on the production of food, fuel, fodder and timber plants, and on the
maintenance of soil fertility and natural stability. In Bangladesh, the main
thrust should be on the introduction of suitable agroforcstry plant species in
the crop fields.
Summary of data for the month of January to June, 1973-
Station: Forest Research Institute, Chittagong.
There are more than 500 tropical hardwood species and a number of grass
and bamboo species in Bangladesh. Only a handful of these are, at present, used
for the manufacture of pulp, paper, fibreboard and rayon. Sundri and gewa of the
Sunderbans and a number of hardwood species of the Chittagong area are used
for the manufacture of paper and fibre boards. Rice straw and bagasse are also
used for the same purpose. Besides, some bamboo species of the Chittagong Hill
Tracts and three grass species of Sylhet district are, at present, used for the manufacture
of pulp and rayon. Most of the other minor hardwood and grass species
have practically no industrial use.
In this study, 20 minor hardwood species and 20 grass species of Bangladesh
have been taken up with a view to determine their suitability for the manufacture
of pulp. Runkel ratio, flexibility co-efficient and relative fibre length have been
found out from the fibre length, fibre diameter, cell-wall thickness and lumen
diameter of the fibres. From those data the tensile strength, tearing resistance and
general suitability of the fibres for the manufacture of pulp and paper could be
estimated. From the Runkel ratio obtained, it can be predicted that most of the
species under study will be suitable for the manufacture of quality paper. Only
Kannari and Jaikkagola among the wood species, daloo and lata bans from the
bamboo species and nal, ikra and khagra among the grass species are likely to
yield moderate quality pulp.
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