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
The experiment was undertaken to investigate the retention of 10% Chromated-Copper-Boron (CCB) solution (2:2:1) in Kala-koroi (Albizia lebbeck) (L.) Benth. wood applying soaking as well as diffusion method. The assessments were applied for 5, 7, 9 and 11 days for both the method. Retention was recorded 1.96 kg/m3,11.78 kg/m3,12.92 kg/m3 and 13.61 kg/m3 in A. lebbeck wood where soaking method applied. Moreover, retention was found 5.22 kg/m3, 6.43 kg/m3, 7.32 kg/m3 and 12.36 kg/m3 in A. lebbeck wood when diffusion method applied. In case of both methods the highest retention was recorded 13.61 kg/m3 and 12.36 kg/m3 for 11 days. Considering the Standard of Bangladesh Standards and Testing Institution (BSTI), i.e., 13.61 kg/m3 and 12.36 kg/m3 retention can meet the suitability of the study.
Heat treatment is often used for improve the dimensional stability of wood. In this study, the effect of heat treatment on physical and mechanical properties of Mahogany (Swietenia macrophylla King) and Acacia hybrid (Mangium x Auriculiformis) wood were examined. Samples were exposed to temperature levels of 110°C, 130°C and 150°C for time spans ranging from 3, 6 and 9 hours. Treated samples had higher mechanical properties compared to control samples. Based on the findings, dimensional stability of all types of wood samples improved with heat treatment. It seems that properties of these wood evaluated were more pronounced with increasing temperature and time durations.
A study was conducted from July 2015 to June 2017 in Hazarikhil Wildlife Sanctuary (HWS) of Bangladesh to find out mammalian species diversity, population density and identification of major threats to the mammalian species of this sanctuary. Various methods were used including transect survey to detect diurnal mammals, and camera trap to identify nocturnal mammals. A total of 33 species of mammals were recorded which belongs to 20 families under 9 orders. Among the recorded species, 13 species of carnivores, 4 bats, 2 Primates, and 6 species of rodents constitute the major pail of mammalian community. According to IUCN (2015), among the recorded 33 mammalian species, 11 species were threatened (4 critically endangered, 5 endangered, 2 vulnerable), 15 species were least concerned and 7 species were nearly threatened. Hunting and poaching, human-wildlife conflict, use of poison for fishing, road inside the forest, forest fire, encroachment for gardening, non-insulated electric wire, grazing were identified as major threats to the mammals of this sanctuary.
The goal of this research was to determine the physical (water absorption and thickness swelling) and mechanical (modulus of rupture, internal bond strength) properties of the experimental bamboo mat overlaid particleboard (MOPB) from the planer wastage of Borak (Bambusa balcooa} bamboo in which Mitinga (Bambusa tulda) bamboo was used as mat covering. All the bamboos were 50-60 feet tall and 3-4 years old. Before manufacturing of composite boards, bamboo mats were treated with an aqueous solution of 10% borax-boric acid (w/v) maintaining borax to boric acid ratio of 1:1 to extend their service life. Urea-formaldehyde glue was used for manufacturing the MOPBs as a resin binder. Five single-layer bamboo MOPBs measuring 500 mm x 500 nun x 12 mm were prepared using a laboratory hot press machine with a target density of 750 kg/m3. The results demonstrate tliat the MOPBs made from bamboo planer wastage with a density of 750 kg/m3 have a significant modulus of rupture (MOR) and internal bond (IB) strength value. The values of modulus of rupture of the MOPBs fulfilled both the Indian (IS 3087: 2005) and ANSI (A208.1-1999) standards, whereas internal bond strength values exceeded the Indian (IS 3087: 2005), ANSI (A208.1-1999) and British (BS 5669-2: 1989) standards specifications.
Artocarpus chanta Bmich, Ham. ex Wall. (Chapalish) is a large, deciduous indigenous forest tree species grown in natural forests. The seed of Chapalish is recalcitrant and loses viability within a few days of maturity that makes problem in storage of the seeds. Optimum storage conditions found useful for prolonging the viability of recalcitrant seeds through preventing water loss. The study was taken to identify the suitable storage methods in order to prolong the seed viability of A. chanta. Nmsery trial was conducted at the National Forest Seed Centre, Seed Orchard Division, Bangladesh Forest Research Institute to evaluate the effects of storage conditions and duration on germination of chapalish seeds. Seeds were stored in five different storage media, viz. i) open room (control), ii) sand, lii) chalk powder, iv) ash and v) sawdust with 8 different storage periods (days), viz. 10, 20, 30, 40, 50, 60, 70, and 80 days. The effects of storage media and storage periods (days) were assessed through seed germination and seedling growth performance. Viability and seedling growth performance were significantly (p<0.05) influenced by storage media, storage periods and their interactions. The results revealed that chalk powder media exhibited significantly higher germination percentage, root length, shoot length and vigor index. It also revealed that it can prolong the viability of Chapalish seeds up to 40 days with 60% germination and was statistically significant at 5% level. The findings may be useful to nursery practioners, foresters, and private plant growers for Chapalish seeds. The storage condition is convenient, low-cost and easily applicable to all nursery owners.
Ecosystem exists at all scales. Ecosystem ranges from a grain of soil to the entire planet and include forests, rivers, wetlands, grasslands, estuaries and coral reefs. The global economy has seen incredible growth over recent decades; growth that has been fuelled by the erosion of the planet’s natural assets. Ecosystem degradation is an environmental problem that diminishes the capacity of species to survive. Ecological restoration has a growing role in policy aimed at reversing the widespread effects of environmental degradation that includes activities to assist the recovery of ecosystem structure and function; and the associated provision of goods and services. On 1st March, 2019, the United Nations
(UN) General Assembly (New York, USA) declared the decade of 2021-2030 the “UN Decade on Ecosystem Restoration”. The purpose has been to recognize the need massively accelerate global restoration of degraded ecosystems, and to fight the climate heating crisis and protect biodiversity on the planet. The Sundarbans is the largest mangrove forest in the world; and it is known for its’ rich biodiversity. Due to the increasein salinity, natural disasters, sea-level rise, illegal felling of trees and over-exploitation of scanty available natural resources, the Sundarbans is losing its rich biodiversity. Thus, this review aims in highlighting the restoration initiatives taken to reverse and conserve the Indian Sundarbans ecosystem. Nurturing this vision, there are three main goals of the UN Decade’s strategy: prevention of degradation, increasing multiple benefits and implementing the idea of ecosystem restoration in education system. There could be a strong corporation between Indian and Bangladesh Governments for long term, sustainable and holistic management of the entire Sundarbans region.
Seed germination percentage of Kusum (Schleichera oleosa Merr.) was examined with 5 pre-sowing treatments in the nursery of Bangladesh Forest Research Institute and growth performances of seedlings were determined in the nursery and field condition. The main aims of the study were to determine the effect of different pre-sowing treatments on seed germination and seedlings growth performance in nursery and field condition. The pre-sowing treatments were: i) soaking of seeds in tap water for 12 hours, ii) soaking of seeds in tap water for 24 hours, iii) soaking of seeds in tap water for 36 hours, iv) soaking of seeds in tap water for 48 hours and v) control (0 hour). The seeds after soaking were sown in the seed bed directly in the nursery. Seed germination percentage were significantly (p < 0.05) influenced by pre-sowing treatments and the highest germination (72%) was obtained when soaked for 36 hours, and the lowest (48%) was in control. With treatment (T3), the maximum shoot length (12.8 cm), root length (11.6 cm), and vigor index (1171.2) were noted. The young seedlings were transferred after 30 days of germination having 3-4 leaves from seed bed to polybags (15×23 cm size) filled with soil and cow dung at 3:1 ratio by volume. Survival percentage of seedlings was maximum (96%) at 2.00 in x 2.00 in spacing in the field and maximum height 105.54 cm 12 months after out-planting. The results of the study suggest the pre-sowing treatment of seeds in tap water for 36 horn s was most effective treatment for higher germination percentage and out-planting of one year old seedlings at 2.00 m x 2.00 m spacing in the field for better growth performance of S. oleosa seedlings.
The experiment was undertaken to investigate the retention of clnomated-copper-boron (CCB) preservatives in Pitali (Trewia nudiflora L.) wood applying soaking as well as diffusion method. The assessments were applied for 5, 7, 9 and 11 days for both the method. The retention of the preservatives were recorded 12.29 kg/m3, 14.97 kg/m3, 15.11 kg/m3 and 15.72 kg/m3 in Pitali wood where soaking method applied. Moreover, retention was found 11.43 kg/m3, 23.49 kg/m3, 24.14 kg/m3 and 25.38 kg/m3 in Pitali when diffusion method applied. In case of both the method, highest retention was recorded 15.72 kg/m3 and 25.38 kg/m3 in pitali wood after 11 days. Considering the Standard of Bangladesh Standards and Testing Institution (BSTI), i.e., 15.72 kg/m3 and 25.38 kg/m3 in Pitali can meet the suitability of the study. According to BDS code, the required retention of CCB is 8-16 kg/m3.
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.
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.
