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
Physical and mechanical properties of Thai bansh (Thyrsostachys siamensis has been studied at three different height positions along the culm. These properties were found to vary significantly along the culm height. The moisture content, sluinkage and the bending strength decreased as the height mcreased, but the specific gravity, compressive strength and modulus of elasticity increased with the height. Variations of these properties were also found significant among the species.
The Dhanmondi Lake Aiea (DLA), Dhaka possesses an overview performance for being an ideal site for bird’s habitat because of its landscape, planted vegetation coverage, old trees and wetland. A study on the avian species diversity, richness and abundance, status, and seasonal variation was conducted from July 2019 to June 2021 in the green space of Dhanmondi Lake Aiea, Dhaka, Bangladesh. A total 57 species of avian fauna belonging to 12 orders, 27 families and 43 genera were recorded during the study period. Among the bird species passerines constituted the highest 30 species (56% of the total species) belonging to 15 families and 23 genera and non-passerine represented 27 species (44% of the total species) belonging to 13 families and 20 genera. Among the total species recorded during the study period 47 (82.46%) were resident bird species and 10 (17.54%) were migratory species. Identified birds’ abundances, richness and threats to them were also discussed in this article.
Effect of pre-sowing treatments on seed germination of jigni (Trema orientalis) was conducted in different growing media to optimize cultural practices for raising seedlings at nursery level. The study was conducted during 2017-2020 at Headquarters Nursery, Silviculture Research Division, Bangladesh Forest Research Institute, Chattogram. The experiment for the nursery technique were laid out in a Completely Randomized Design (CRD). The seeds of Trema orientalis have been observed to exhibit physical dormancy due to presence of hard seed-coat. To overcome this problem, seeds were heated with six water soaking treatments except two (Coated seed without treatment, To and un-coated seeds without soaking treatment, T00) and were sown in germination media such as trays, polybags and seed beds. Six pre-sowing treatments were, Coated seeds immersed in normal water for 24 hours (Tj), 72 hours (T2) and 120 hours (T3) and un-coated seeds dipped in normal water for 24 hours (T01), 72 hours (TQ2) and 120 hours (T03) respectively. Jigni seeds showed the highest germination (75.94%) in TQ3 sown in seed bed and lowest Too (20.24%) which was significantly (P<0.05) different from other treatments. The result also showed that the highest mean height (88.5 cm) and collar diameter (3.77 nun) was recoided in T03. These findings revealed that, seeds soaked in normal water for 120 horns and then sown in seedbed were found suitable for quick germination and maximum seedlings production for jigni.
This study was carried out to investigate the suitability of particleboards using uprooted tea plants (Camellia sinensis). Wastage and uprooted tea plants were collected from Neptune Tea Garden, Chattogram. The uprooted tea plants were cut into the clipper machine into small portions. Following that, they were processed into chips using a hammer mill machine, which was then dried in a batch oven to the suitable moisture content (5%). Single-layer particleboards were fabricated in a laboratory hot press machine with four different densities i.e. 650, 700, 750 and 800 kg/m3 using liquid urea formaldehyde as an adhesive. Finally the physical and mechanical properties of particleboards made from uprooted tea plants were studied. Characteristics of particleboards such as modulus of rupture (MOR), internal bond strength (IB), water absorption (WA) and thickness swelling (TS) were measured as a part of the experiment. Results show that particleboards made from uprooted tea plants of 800 kg/m3 density had good static bending MOR property (112.00 kg/cm2) and excellent IB strength pioperty (10.04 kg/cm2). The mean MOR value of the 800 kg/m3 density particleboards was above the Indian (IS 3087, 2005) and ANSI (A208.1-1999) standaid specifications but lower than the British (BS 5669-2:1989) standard specification. Moreover IB strength value was above the Indian, ANSI and British standaid specifications.
Germination percentage of Tamarindus indica L. seeds were observed with 4 pre-sowing treatments viz, i) soaked in cow urine for 24 hours, ii) soaked in cow dung slurry for 24 hours, ii) soaked in tap water for 24 hours, iv) soaked in hot water (100 0 C) for 30 seconds and followed by one hour in tap water and v) control, in the nursery of Bangladesh Forest Research Institute, Chattogram. Growth performances of seedlings were also determined in nursery and field conditions. The germination test was conducted in nursery bed filled with soil and decomposed cow dung at a ratio of 3:1. The growth performance of seedlings were determined by transferring the young seedling after 30-45 days of germination having 5-6 leaves from germination bed to polybags (15 cm × 23 cm) filled with soil mixed with cow dung. Growth performance in the field was observed by out planting one year old seedling at 1.5 m × 1.5 m, 2.0 m × 2.0 m and 2.5 m × 2.5 m spacing. Germination percentage was significantly (p<0.05) influenced by pre-sowing treatments and highest germination percentage (86%) was obtained in cow urine treatment for 24 hours and lowest (44%) was found in hot water treatment. Growth performance of seedlings was also influenced by pre-sowing treatments in the nursery and highest vigor index was observed in cow urine treatment (3988) and lowest in hot water treatment (1629). Survival percentage of seedlings was highest 98% at 2.0 m × 2.0 m spacing in the field and average height was more than 68 cm after 12 months of out planting. Therefore, pre-sowing treatment of seed in cow-urine for 24 hours suggested for nursery raising and one old year seedlings may be planted at 2.0 m × 2.0 m spacing in the field for successful plantation of the species.
Dendrocalamus giganteus is one of the biggest and largest bamboo of Bangladesh which is locally known as bhudum bansh. The conventional
propagation methods of bamboos are not economically viable for large scale production due to their scarcity of seeds, low multiplication rate, labor intensive and high cost. In vitro propagation is becoming a promising tool for conserving and mass propagation of different bamboo species. In this study establishment of a reliable and reproducible protocol for the micro propagation of D. giganteus from axenic culture of in vitro germinated seedlings has been reported. Highest 83.33% seeds were germinated on MS (Murashige and Skooge 1962) medium supplemented with 1.0 mg/L BAP (6-benzyl -amino-purine) after 7 days of culture. MS supplemented with different concentrations (0.0, 1.0, 2.0, 3.0 and 4.0 mg/L) of BAP and Kn (6-furfuralaminopurine) at evaluated either singly or in combinations for multiple shoot production. Maximum 16.33 numbers of young shoots per culture were recorded in medium supplemented with MS + 3.0 mg/L BAP + 1.0 mg/L Kn + 4% sugar + 2.75 g/L after 28 days of culture. Rooting ability of the shoots was assessed in half strength MS media supplemented with different concentrations (0.0, 1.0, 2.0, 3.0, and 4.0 mg/L) of IBA (Indole-3-butyric acid). The highest rooting percentage (66.67%) was achieved from the half strength MS medium supplemented with 1.0 mg/L IBA 2 after weeks of culture. The rooted plantlets were successfully hardened in soil under greenhouse and nursery of Silviculture Genetics Division, Bangladesh Forest Research Institute. The survival percentage of tissue culture plantlets in nursery was found to be 90-95% after 60 days of acclimatization. The protocol developed through this study enable to produce large number of D. giganteus bamboo seedlings for mass propagation in a short period of time.
Functioning and productivity of forest ecosystems vastly dependents on the phenological characteristics of the tree species. The study was carried out from June 2017 to December 2018 to explore the phenological traits of 74recalcitrant seed bearing tree species of natural forests and plantations in Bangladesh. Data were collected from Chittagong University campus, Hathazari, Boalkhali, Hazarikhil, Dohazari, Rangamati, Kaptai, Ukhiya, Bandarban and Khagrachari through repeated field visits including review of published papers. The results showed that flowering, fruiting and seed maturity periods varied from species to species. The Seventy Four tree species belongs to 55 genera of 31 families. Maximum (39.19%) fruits were under the Berrycategory and minimum (1.35%) in Samara. The study revealed that floweringof maximum species occurred during March (54.05%) and fruiting inMay(54.05%). The peak period for collecting viable recalcitrant seeds was foundboth in May and June (36.49% respectively). The study will be a readyreference with information on flowering, fruit initiation and seed collection time of 74 recalcitrant seed bearing trees of Bangladesh. The findings of thestudy may be useful to the nursery owners, foresters, and private plant growers for collection of seeds in right time and establishment of the plantations. This paper may also be a supportive document to the policymakers in taking decision on raising seedlings of recalcitrant seed bearing trees for mass plantations towards the greening program of the country.
Jarul (Lagerstroemia speciosa L. Pers., Family- Lythraceae) is a semi-deciduous medium to large-sized tree with fluted bole, small buttress and slightly flaky bark tropical flowering tree species. It is a common ornamental tree planted along roadsides, gardens and parks in Bangladesh. The main aim of this study is to develop mathematical models for total volume estimation of jarul. To meet the quest we have tested 21 models for volume equation by regression technique. The best-fitted model for studied species have been selected by highest value of R2 (coefficients of determination), the lowest value of Akaike Information Criterion (AIC) and Root Mean Square Error (RMSE). The selected models also validated by Chi-square test of goodness of fit, Paired t-test, Percent Absolute Deviation (%AD) and 45 degree line test. The study appearance that, for one way analyses the model ln (V) = a+b ln (D) and for two way analyses ln (V)= a+b ln (D)+c ln (H) appeared to the best model for estimating the standing tree volume of jarul. Conversion factors equation has been determined to estimate under bark volume and under bark volume of different top end girth of 30, 35, 40 and 45 centimeters from these models. The best-fit volume model showed the highest efficiency in volume estimation compared to previous developed volume model of this species in terms of Model Prediction Error (MPE), Model Efficiency (ME) and Root Mean Square Error (RMSE).
Germination percentage of Tamarindus indica L. seeds were observed with 4 pre-sowing treatments viz, i) soaked in cow urine for 24 hours, ii) soaked in cow dung slurry for 24 hours, ii) soaked in tap water for 24 hours, iv) soaked in hot water (100 0 C) for 30 seconds and followed by one hour in tap water and v) control, in the nursery of Bangladesh Forest Research Institute, Chattogram. Growth performances of seedlings were also determined in nursery and field conditions. The germination test was conducted in nursery bed filled with soil and decomposed cow dung at a ratio of 3:1. The growth performance of seedlings were determined by transferring the young seedling after 30-45 days of germination having 5-6 leaves from germination bed to polybags (15 cm × 23 cm) filled with soil mixed with cow dung. Growth performance in the field was observed by out planting one year old seedling at 1.5 m × 1.5 m, 2.0 m × 2.0 m and 2.5 m × 2.5 m spacing. Germination percentage was significantly (p<0.05) influenced by pre-sowing treatments and highest germination percentage (86%) was obtained in cow urine treatment for 24 hours and lowest (44%) was found in hot water treatment. Growth performance of seedlings was also influenced by pre-sowing treatments in the nursery and highest vigor index was observed in cow urine treatment (3988) and lowest in hot water treatment (1629). Survival percentage of seedlings was highest 98% at 2.0 m × 2.0 m spacing in the field and average height was more than 68 cm after 12 months of out planting. Therefore, pre-sowing treatment of seed in cow-urine for 24 hours suggested for nursery raising and one old year seedlings may be planted at 2.0 m × 2.0 m spacing in the field for successful plantation of the species.
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.
Welcome to the Bangladesh Journal of Forest Science (BJFS) – a leading platform for advancing the knowledge and understanding of forest science in Bangladesh and beyond. Established with a commitment to excellence, BJFS serves as a cornerstone for researchers, practitioners, and enthusiasts dedicated to the sustainable management and conservation of forest ecosystems.
