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
EUCALYPTS were introduced in Bangladesh probably in 1930. The Bangladesh Forest Research Institute started trials on this species in 1963. It was established through research that the soil and climate of this country are suitable for Eucalyptus canialdulensis, E. brassiana and E. teriticomis. The research results and experience gained by the foresters of Bangladesh, India and some other countries show that eucalypts do not disturb the ecosystem even if planted in a large-scale. Eucalypts can be planted for the production of timber, fuelwood, aroma, oil, gum and pulp. Therefore, this species may be highly economic if properly managed. Its only bad side is that the absentee farmers and rural landowners may find planting of eucalyptus more profitable and advantageous than the traditional agriculture. This may induce rural unemployment.
Pulping of bamboo-hardwoods in a mixture showed that H-factor required in soda + AQ and low sulphidity kraft + AQ was slightly lower than the calculated value from the mixture of the components. The total pulp yield for kraft15 + AQ was higher than the calculated value. But for soda + AQ it was lower from the theoretical value. The tensile strength of the pulp obtained in soda + AQ process was better upto 60% bamboo chips in the mixture. It showed superior quality with more than 60% bamboo in the component in low sulphidity kraft pulping. The bursting strength of the pulp decreased as the bamboo chips increased in kraft15 + AQ pulping. The tear strength behaved almost linearly with any proportion of bamboo chips with wood chips.
The Chakaria Sundarbans has been subjected to severe biotic interferences in the recent decades. A study was carried out to assess the present status, past condition, process of destruction and also to examine the feasibility of reforestation in this mangrove forest. The remnants of most of the commercially important species are available. The greater part of the forest has been converted to shrimp farms. The entire area is virtually without any vegetative cover. The land is apparently suitable for reforestation with mangrove species. However, a rehabilitation programme is only possible if the cooperation of the shrimp farmers and local people can be ensured.
In Bangladesh invasion of ipil-ipil psyllid Heteropsylla cubana Crawford (Psyllidae : Homoptera) was first detected at Bagachattar near Chittagong in 1989. Later a survey on the pest showed that besides other parts of Chittagong it had spread to some parts of greater Dinajpur and Faridpur districts. Both the nymphs and the adults of the psyllid suck sap from young foliage and tender shoot causing drying up of the terminal portion of the branches. The infestation was prevalent during the dry period from October to April. The psyllid also infested rain tree (Sarnanea sanian) and raj koroi (Albizia richardiana) in Bangladesh. In the nursery the pest was controlled by spraying 0.1% malathion three times at an interval of 15 days. One species of coccinellid, one species of dragonfly and two species of spider were recorded as predators of the psyllid in Bangladesh. As chemical control has some drawbacks, stress should be given on breeding psyllid resistant species/clones and utilization of predators, parasites and pathogens to control the pest. As it is a major pest of ipil-ipil in many countries specially in the South and South-East Asian regions, close cooperation and collaboration in both regional and international levels will be of great advantage to combat the problem.
The variation of strength properties of mangium (Acacia mangium) wood treated with the CCA preservative has been studied. It is found that compression parallel to grain, tension perpendicular in radial face and shear parallel to grain in tangential face have been significantly affected by the treatment. The treatment causes reduction in modulus of rupture, stress at proportional limit in static bending and shear parallel to grain. All other strength properties are observed to increase from 3 to 81 percent by treatment.
The nature and status of the non-wood forest products (NWFP) of Bangladesh have been discussed. The present institutional arrangements for collection and processing of NWFP have been analysed and major problems identified. Some policy and functional/managerial suggestions have been made to improve and augment the production and management of the NWFP.
Seed germination of golla-bet (Daemonorops jenkensiana) after pre-sowing treatment was studied. The seeds treated with HCL and H2SO4 separately showed 64-68% and 50-68% germination respectively irrespective of different concentration of acid. On removing only scally epicarp, germination of golla-bet increased to 51% without any acid treatment. The results indicate that acid scarification turn the hard seed coat into thin and papery resulting easy infiltration of water to accelerate possible enzyme activities in endosperm.
The soil moisture stress significantly affected the growth of the four selected eucalypt species. In case of Eucalyptus citriodora the growth improved as the soil moisture content increased up to 53% of field capacity. In case of other species the growth improved up to 67% of field capacity. The root growth was adversely affected with an increase in soil moisture content and therefore there was a decline in the root/shoot ratio. The overall growth was very poor in this highly acid and low fertility level soil.
Minjiri (Cassia siamea Lam.) is a promising fast growing tree species indigenous to Bangladesh and is included in the plantation programme. An attempt has been made to prepare the biomass tables for the species. The biomass equations were selected to estimate the green weight of the whole tree, weights of the stem, the branches, leaves and twigs, branches and stem; branch, leaves and twigs. The diameter at breast height (D) – biomass and D-height – biomass relationships were determined. It was observed that the logarithmic function to the base “e” gives a good fit model. The conversion factors were also determined to estimate the air-dry and oven-dry weights of the components.
In recent decades, the Chakaria Sundarbans located in Cox’s Bazar district has been subjected to a tremendous human interference. It was once covered with moderately dense mangroves. It is now a denuded area. A major proportion of the forest areas has been converted to shrimp ponds. The remaining areas fall under the normal tidal inundation. The Forest Department sought research backup from the Bangladesh Forest Research Institute (BFRI) to develop techniques for the rehabilitation of the mangroves of Chakaria Sundarbans. Accordingly, a reconnaissance survey was conducted. It showed that the area outside the shrimp farms was suitable for raising mangrove species from silvicultural point of view (Siddiqi et al. 1992). Five species, namely sundri (Heritiera fames’), gewa (Excoecaria agallocha), kankra (Bruguiera sexangula), passur (Xylocarpus mekongensis) and baen (Avicennia officinalis) were chosen for trail in the denuded areas.
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