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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:

Sundarbans, the largest single continuous tract of natural mangroves in the world,
is endowed with a diverse group of plants and animals and has recently been given the
status of’World HeritageSite’ by the UNESCO.Thispaper gives a briefaccount of31 species
of insect pests attacking Sundarbans mangroves of Bangladesh. The pests include five
species of defoliators, three stem borers, eight fruit borers, two gall makers, one sap sucker,
one root feeder and 11 wood borers. These include 17 specks of Coleoptera, 11 species of
Lepidoptera, two species of Diptera and one species of Homoptera.

Abstract:

Two sap samples of Nypafruticans were collected in November 1996 and in April
1997 from the Chakaria Sundarbans for the production ofsugar, vinegar and alcohol. The
samples were first analysed to determine tire sugar contents by hand refractometer. The
first sample contained around 10.0% sugar, while the second contained about 8.0%.
Experiments were also conducted to produce vinegar trom the first sample and alcohol
from the second, each with and without addition ofsugar. Various amounts of yeast,such
as 0.2%, 0.6% and 1.0% (w/v) were added to determine the optimum yield of vinegar and
alcohol by fermentation process. It was observed that, in both the cases, addition of 0.6%
(w/v) yeast yielded the highest amount of acetic acid (4.3%) and alcohol (-5.0%) as
azeotropic mixture. There was about 0.2% increase in acetic acid yield with 0.6% (w/v)
yeast and further addition of 2.0% sugar to the original sample. The highest yield of
alcohol, 5.5% (as azeotropicmixture) was obtainedwhen the sap solution contained 13.0%
sugar and 0.6% (w/v) yeast. This shows thatN.fruticanssap may be a prospective source
for production of sugar, vinegar and alcohol in the country

Abstract:

This paper presents information about growth, harvesting ages and yields for
jalibet (Calamus tenuis’), kerakbet (C. viniinalis) and gollabet (Dacmonorops jenkinsiana)
raised in semi-evergreen/deciduous forests of Bangladesh. Clump expansion with
increasing age was highest for C. tenuis and C. viniinalis in Chittagong, and for D.
jenkinsiana inSylhet. Mean annual height increments ofmain shoot of a clump ofC. tenuis,
C. viniinalis and D. jenkinsiana were 0.94 + 0.08,1.11+0.09 and 1.45±0.11 m respectively.
Highest number of shoots per clump was noticed for C. tenuis in Sylhet followed by
C. viniinalis and D. jenkinsiana in Chittagong. Mean diameters of the main shoot of these
species were 1.6 ± 0.1, 2.14 + 0.1 and 3.01 ± 0.13 cm respectively. Wildings were found
under the clumps with varying numbers. The exploitable ages for C. tenuis, C. viniinalis
and D. jenkinsiana appeared to be 6-8, 9-11 and 10-12 years respectively. Further
information and studies are needed to determine the harvesting cycle and suggest a
management plan for rattans.

Abstract:

Several studies were previously conducted on pulping of jute plant by
alkaline processes. But the response of the plant to alkaline pulping is poor. In the
present study neutral sulphite anthraquinone (NS – AQ) process proved more
advantageous over alkaline processes. The process is capable of producing a
significantly higheryield compared to the alkaline processes. The physicalstrength
properties of NS – AQ jute plant pulp stand in between hardwood and softwood
kraft pulps. However, success of commercial utilization of jute plant in pulp
making largely depends on efficientmeans of collection, transportation and storage
of the plant. Hence, due attention to these problems must be given

Abstract:

Ipil-ipil {Leucaena leucocephala (Lam.) de Wit} is considered as an
outstanding tree because of its worldwide success as a highly nutritious forage
tree. Thisstudy is an attempt to determine suitable spacing formaximumbiomass
production. Widerspacing (60 cm x 60 cm) provided maximum seedling growth
(height 177.9 cm and collar dia. 15.3 mm) and biomass production (green weight
276.0 g/seedlingand dry weight 166.5 g/seedling) at the age ofnine months of the
seedlings. However, closerspacing (15 cm x 15 cm) produced significantly higher
biomass(greenweight 28.21 ton/ha and dry weight 11.68 ton/ha) on an area basis.
Small land holding farmers may rear their livestock by planting this legume and
harvesting under a ‘cut-and-carry’ system which will supply high quality forage
that uses to supplement low quality roughage such as crop residues.

Abstract:

The colonization status of arbuscular mycorrhizal (AM) fungi of Melia azedarach L.
seedlings grown from seven different types of pre-sowing treated seeds and the spore
population in the rhizosphere soils were studied. The percent root colonization varied
significantly and ranged between 14.81-95.0 in different treatments. The superior
seedlings showed heavy root colonization as compared to otherseedlings. The intensity of
colonization and spore population also varied significantly in different treatments. Spore
population was not correlated with the percent root colonization and seedling growth
parameters. Four AM genera such Glomus, Acaidospora, Entrophospora and Gigaspora were
identified from the rhizosphere soils of the seedlings. The importance ofAM fungi has been
ensured from this study for the primary establishment of M. azedarach seedlings in the
nursery

Abstract:

Physical and chemical properties of some soils from Madhupur rubber
plantation area in Bangladesh have been studied. Results of particle-size distribution,
oven dry/air dry ratio, field moisture capacity, pH, organic carbon, total nitrogen,
cation exchange capacity (CEC) and exchangeable cations of the soils on depth basis
have been presented. The nutrient contents of these soils have also been reported. With
respect to nutrient status and physico-chemical properties, these soils are considered
to have good potentiality and prospect for increased production of rubber, if proper
attention and management practices are adopted.

Abstract:

The paper presents the anatomical features of bamboo leaves in transverse
section for 26 bamboo species underseven genera occurring in Bangladesh both in wild
and in cultivation. The results are presented in a tabular form. The findings indicate that
anatomical features ofbamboo leavesin transverse section work as taxonomic characters
at species level. The paper also provides a dichotomous key to identify bamboo species
occurring in Bangladesh based on leaf anatomical characteristics.

Abstract:

This paper deals with detailed macroscopic and microscopic characteristics of
five timber species, namely Calophylluni polyanthum Wall., Garcinia cowa Roxb.,
G. xanthochynius Hook., Kayea floribimda Wall, and Mesuaferrea Linn, of Guttiferae from
Bangladesh. Dichotomous keys based on both the macroscopic and microscopic
features have been developed for their identification.

Abstract:

Casuarina equisetifolia seedlingsinoculated with different biofertilizerssuch as
Azospirillum, Phosphobacterium, VAM fungi and Frankia and their combinations were
planted in farmland. Growth parameters were collected at bimonthly intervals up to
30 months. Biomass was estimated 24 months after planting. Maximum height, girth
at breast height (gbh) and total biomass were obtained in the combined application of
Azospirillum, Phosphobacterium, VAM and Frankia. The combination of VAM +
Frankia among double inoculation, and the combination of Azospirillutn, VAM and
Frankia in triple inoculation also proved to be the best treatment in promoting the
significant total height, gbh and total biomass production

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