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
Aglaia cucullata (Roxb.) Pellegr. is a less salt-tolerant tree species of Sundarban mangrove ecosystem. The present study was conducted to investigate the influence of salinity on the survival and growth ofA. cucullata seedlings and nutrient distribution in seedling parts. All (100%) the seedlings of A. cucullata was found to survive at non-saline to slightly saline (0 to 5 PSU) condition and no seedlings were survived beyond 15 PSU salinity. Seedling growth in terms of biomass, height and collar diameter showed a significant (p<0.05) negative relationship with the salinity gradient. The highest concentration of nitrogen (42 to 25 mg/g) and potassium (34 to 30 mg/g) was found at leaves. While roots contained the highest phosphorous (4 to 3 mg/g) and sodium (34 to 13 mg/g). However, nitrogen, phosphorous and potassium in different parts ofseedlings showed significant (p >< 0.05) negative correlations with the salinity gradient, while sodium showed a significant (p < 0.05) positive correlation. In conclusion, A. cucullata is very sensitive to salinity for survival, growth and nutrient distribution in their parts, and that the distribution of this species may be confined only in the less saline areas of Sundarban.
The paper deals with seed germination and seedlings growth performance of Calamus erectus in the nursery and field conditions. Clean seeds were sown in the seed bed filled with soil and decomposed cow dung at 3sl ratio. Seeds started germination after 52 days of sowing and completed within 76 days with maximum 78% germination. The survival performance of the seedlings was determined by transferring the seedlings from germination bed to the polybags from 10-80 days after germination with 10 days interval. Optimum survival (100%) was found significant (p<0.05) transferring after 30-40 days of germination from seedbed to polybag. Plantation in the field was made with one year old seedling at 2.0 m x 2.0 m spacing. Average seedlings survival was 94% after one year of plantation in the field. Mean seedling height was recorded 94.6 cm after two years of planting. Survival of seedlings and growth performance in the field were satisfactory when one year old seedlings were out-planted. Clean or decoated seeds for nursery raising and one year old seedlings were found suitable for successful plantation raising of Calamus erectus.
Propagation and conservation by vegetative means were attempted for better preservation of true-to-type genetic characteristics with higher yield planting materials of Acacia hybrid. In this regard, in vitro micro propagation of Acacia hybrid through shoot tip culture was initiated from outdoor mature plant on MS basal medium supplemented with 1.0 mg/L BAP. The shoot tip cultures produced axillary shoot bud and used for multiple shoot production. The multiple shoot production rate was optimized on MS medium supplemented with different concentrations of cytokinins. The highest number (20) of multiple shoots per culture was recorded on MS medium augmented with 2.0 mg/L BAP after 8 weeks of culture. The rooting was initiated on Yi MS medium enriched with different concentrations of IBA. The best rooting rate 90% was obtained on medium having 2.0 mg/L IBA after 28 days of culture. The well-developed rooted plantlets were transferred to in vivo condition for further growth and acclimatization. More than 95% of transplanted plantlets survived and grew well in polybag under natural condition.
Keora (Sonneratia apetala Buch.-Ham.) is one of the most important tree species for large scale plantations in the coastal areas of Bangladesh. The aim of this study was to generate a common volume equation and table for predicting the total and merchantable volume of planted and natural stand of S. apetala in the coastal areas of Bangladesh. A total of 430 sample trees having different girth classes were sampled from the plantation stands of Chattogram, Noakhali, Bhola and Patuakhali. Twenty one (21) models were tested to derive best-fit models for the volume over bark and under bark. The best fit models were selected based on the highest value of R2 (co-efficient of determination), the lowest value of Akaike Information Criterion (AIC) and Root Mean Square Error (RMSE). The selected models were validated by Chi-square test of goodness of fit, Paired t-test, Percent Absolute Deviation (% AD) and 45 degree line test. The best-fit one-variable and two-variable basic models were and respectively. The best-fit models showed the highest efficiency in volume estimation compared to previous developed model in terms of Model Prediction Error (MPE), Model Efficiency (ME) and Root Mean Square Error (RMSE).
The physical and mechanical properties of Jhau (Caswarma equisetifolia) grown in Chattogram timber species were studied. The results indicate that jhau wood is fallen in very heavy and very strong categories. The specific gravity and the volumetric shrinkage of Jhau timber is higher than
that of Chattogram teak which was recommended as standard for comparison of other timber species in Bangladesh. The species can be used for house posts, agricultural implements, tool handles and other household articles.
Kaptai National Park (KNP) is a protected area and represents a tropical semi-evergreen hill forest and home of widest variety of biodiversity in the country. Floristic composition and regeneration status of Kaptai National Park was assessed through stratified random sampling method. A total of 200 sample plots were taken of 20 m * 20 m in size for trees and 2m * 2 m in size for regeneration data collection. Result of the study showed that there were 114 tree species belonging to 42 families and 77 regenerating species belonging to 35 families were recorded from the sample plots. The highest tree stem and regenerating seedlings density was found 373 stem ha-1 and 11788 stem ha-1 for Aporosa dioica. The study indicated that A. dioica is the most dominant tree species and its natural regeneration was also abundant in Kaptai National Park. On the other hand, Shannon-Wiener’s diversity index, Margalef’s diversity index, Simpson’s and Pielou’s diversity index were recorded for all the tree species. The percentage distribution of seedlings was maximum (56.56%) in 0-50 cm height range for all species. The number of seedlings reduced proportionately with height growth indicating a reduction of recruitment to next growth stage. Among the regenerating species, Grewia nervosa showed maximum (9.15%) seedling recruitment. The study is made baseline information on the natural regeneration of tree species diversity in the protected area which is helpful to future research work on plant population change, conservation and sustainable management planning for Kaptai National Park.
A study was investigated to assess the preliminary growth performance of sal (Shorea robusta) in
mixture with its four associates e.g. chakua koroi (Albizia chinensis), motor koroi (Albizia
lucidor), shimul (Bombax ceiba), udal (Sterculia villosa) and other three site suitable species e.g.
neem (Azadirachta indica), teligaijan (Dipterocarpus turbinatus), dhakijam (Syzygium firmum) in
degraded sal forest in the northern region of Bangladesh. Two experiments were established in
June 2017 and June 2018 at Charkai Silviculture Research Station, Birampur, Dinajpur. Sal and
motor koroi, chakua koroi, neem and teli garjan were planted in four treatments with four
replications in 2017. In 2018 sal and shimul, udal, dhakijam were planted in three treatments with
four replications. Randomized complete block design was followed. Plantation was established in
June-July. Each replication plot was 14 m x 14 m in size with 49 seedlings for mono-plantation
and 49 seedlings for mixed plantation in 483 ratio at 2 m x 2 m spacing. Single line alternate was
applied in mixed plot for raising plantation. In the experiment, preliminary data on the survival
rate, height (cm) and diameter (mm) of two-years-old and one-year-old seedlings of sal and
associate species from single and mixed plantation data were collected in July, 2019. Analysis of
data showed significant differences among sal and selected treatment species at 5% significant
level other than neem. These findings revealed that, as site suitable species, garjan and dhakijam
showed the significant growth performance in mixture with sal as well as in mono-plantation.
Moreover, chakua koroi, motor koroi and udal can also be considered as good associates of this
suggested sal mixed plantation.
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Mature seeds of Uvaria cordata (Dunal) Alston were sown in polybag, nursery bed, propagator house, and root trainer and investigated to find out the suitable media for raising seedlings for conservation programs of species in Chittagong University Campus. The germination percentage, germination index, germination value, shoot length, collar diameter, leaf number were assessed for 12 months old seedlings in the nursery. The germination percentage (92.31%), germination energy (35.89%), and germination value (2.6493) were found the highest in T2 treatment (seed sown in nursery bed) and significantly (p<0.05) different from other treatments except for To (polybag). Maximum germination index (0.2713), germination uniformity (0.0039), and minimum germination start time (30 days) observed in To (polybag), significantly (p< 0.05) different from other treatments. After 12 months of germination, maximum shoot height (25.57 cm), collar diameter (6.32 mm) and leaf number (16.40) revealed highest in T3 treatment. Seeds sown in polybags were revealed comparatively better germination behavior than other treatments. Seeds
sown in root trainer were found suitable for vigorous seedlings production for Uvaria cordata.
This experiment was conducted to evaluate the suitability of medium density fiberboard (MDF) made from hybrid Acacia wood fiber as raw material and urea formaldehyde (UF) as resin binder. Single layer fiberboards were fabricated by five different densities e.g. 700, 725, 750, 775 and 800 kg/m3 using hybrid Acacia wood fiber. Mechanical and physical properties including modulus of rupture (MOR), internal bond strength (IB), thickness swelling (TS) and water absorption (WA) of the fiberboards were tested according to the Indian Standard (IS 2380:1977). The results of the physical and mechanical properties of the fiber boards were compared with Indian Standard (I 12406: 2003), Euro Standard (D-6300, 1990) and American National Standards Institute (ANSI) MDF standard (A208.2, 1994). The results showed that the 800 kg/m3 density fiberboards made from hybrid Acacia wood had the best MOR value and maximum IB strength characteristics among the others. For 800 kg/m3 density fiberboards the MOR value was above the Indian & ANSI Standard but lower than the Euro Standard; and the IB strength value was above the Indian, Euro & ANSI Standard specifications. Water absorption and thickness swelling properties were used to determine the water resistance of the fiberboards.
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