Bamboo Dendrocalamus Research Articles

Bacillus bombysepticus, an Entomopathogen in Yellow-Spined Bamboo Locust with Biocontrol Potential.

Ceracris kiangsu (Tsai) (Orthoptera: Acrididae) is a severe pest of the bamboo Dendrocalamus barbatus Hsuch & D.Z. Li that is widely grown in plantations in Vietnam. A biocontrol option to manage this pest is a priority for the forest sector. This study evaluates whether there are potential biocontrol candidates within the C. kiangsu population. Bacteria were isolated from C. kiangsu nymphs that were parasitized in the field. In a nursery experiment, three Bacillus bombysepticus Wang isolates (FPRC17, FPRC23 and FPRC30) caused 63-68% mortality of C. kiangsu nymphs 9days after spraying, and the results were similar to applying a commercial Bacillus thuringiensis product. In a field trial, feeding damage from a C. kiangsu infestation was reduced by over 70% at 15days after spraying these isolates. This finding reveals the potential for the development of a natural biopesticide for bamboo locust management in Vietnam.

Exploring silica accumulation in bamboo leaves: A study on phytolith morphology and epidermal patterning in the tropical giant bamboo Dendrocalamus copelandii.

Bamboo is a grass in the Poaceae family with various applications. Bamboo leaves can accumulate high silica. However, silica deposition in bamboo has received limited study. Therefore, this research investigated silica accumulation in Dendrocalamus copelandii leaves. The study includes the localisation of silica through phytolith morphology, examination of the distribution patterns of phytoliths in epidermal tissues, analysis of silica accumulation within specialised silica cells (short cells), and analysis of silicon concentration across various leaf developmental stages. We employed imaging techniques, including Differential interference contrast and Scanning electron microscope incorporated with an energy-dispersive X-ray spectrometer, to investigate silica accumulation in bamboo leaves. We also analysed silicon concentration using Inductively coupled plasma-optical emission spectroscopy. Leaves of D. copelandii exhibited 11 phytolith morphotypes, such as BILOBATE, POLYLOBATE, SADDLE, ACUTE, ACUTE BULBOSUS, MICROHAIR, STOMATA, BULLIFORM FLABELLATE, ELONGATE SINUATE, ELONGATE ENTIRE and TRACHEARY. Most of these phytoliths were found in short cells (BILOBATE, POLYLOBATE and SADDLE) of epidermal tissues. The short cells were arranged transversely along the leaf length. BILOBATE was found in both the abaxial and adaxial epidermis, while SADDLE was found only in the abaxial epidermis. Silica accumulation in the short cells of unexpanded leaves begins at the leaf apex, spreads to the middle and base positions, and accumulates first in the abaxial before the adaxial epidermis. Moreover, bamboo leaves accumulate more silicon concentration as they age. Phytolith morphotypes and silica accumulation in epidermal short cells are key factors in understanding silica deposition. Leaf age and climate significantly impact silicon concentration in bamboo leaves. Our findings are informative for archaeological studies and for plant taxonomical classification. The results are also applicable for biotechnological applications.

Integrated physiological, transcriptomic and rhizospheric microbial community analysis unveil the high tolerance of woody bamboo Dendrocalamus brandisii under cadmium toxicity

Cadmium (Cd) can disrupt the physiological functions of plants and affect the soil microenvironment. Previous studies have demonstrated the strong Cd tolerance of woody bamboo species, but the underlying mechanisms remain unclear. Dendrocalamus brandisii is a famous woody bamboo produces highly valued bamboo shoots in SW China and Southeast Asia. To analyze D. brandisii's tolerance mechanisms to Cd stress, changes in physiology, gene expression, and rhizosphere microbial structure were analyzed in a simulated pot experiment, by exposing D. brandisii to different Cd concentrations. According to the results, the roots are the main sites for Cd accumulation. Transmission electron microscopy (TEM) demonstrated that excess Cd induced damage to plant organ cell ultrastructure, as chloroplast structural abnormalities and deformations in cell walls. Based on transcriptome analysis, some key DEGs and their involved pathways, such as metal transporters were identified to perform crucial roles in Cd tolerance. In addition, Cd significantly affects soil pH and further influences microbial community structure. Under Cd stress, the increased abundance of Proteobacteria and Ascomycota likely facilitated Cd tolerance in D. brandisii. Overall, the physiological characteristics of D. brandisii and beneficial rhizospheric microbes may improve the Cd tolerance in this bamboo, implying woody bamboos are a promising environment-restoration plant. These results provide important information for further research on multifunctional genes of Cd tolerance and selective changes in rhizosphere microbial communities.

Laboratory Studies of Bamboo Dendrocalamus Asper on Peat Soil Settlement by Continuous Loading

Laboratory Studies of Bamboo Dendrocalamus Asper on Peat Soil Settlement by Continuous Loading

Deformation of peat soil reinforcement settlement using single-layer bamboo dendrocalamus asper

Abstract As a unique soil, peat soil has extreme characteristics such as very high compressibility when any load applies to it. It has the condition of partially decomposed plant and animal make it unsuitable used as a foundation for construction. Due to this, the reinforcement of peat must be improved or stable. The stability of peat was more stable when the reinforcement is held or tied with a strong material that can be used for the long term. Therefore, this study to identify the deformation settlement of single-layer bamboo Dendrocalamus asper that using as reinforcement for the peat. The testing at the laboratory and physical model were conducted to fulfill the objective of the study which is to identify the physical properties (water content, specific gravity, organic content, fiber content, degree of decomposition), mechanical properties (consolidation test), and displacement of settlement through physical modeling at the laboratory. The result shows that the soil collected at Kampung Parit Puteri Menangis, Benut, Johor has a moisture content of 672%, specific gravityof 1.23, organic content of 88.34 - 96.19%, fiber content of 38.1%, and categories H4 to H6 (Hemic). The compression index (Cc) was determined in the range of 0.13 to 1.54, the consolidation coefficient (Cv) was determined in the range of 0.62 to 4.925, while the coefficient of compression (Cα) was determined in the range of 0.02 to 0.048. For the displacement of the settlement of peat show the bamboo reinforcement reduce the settlement under different load. The settlement decreased by 59% of the final load 4 kg/m2 during 2 hours in the displacement 9.543 mm to 3.867 mm. It is shown that the properties of peat react with the soil and began to settle down slowly until the reading remained constant.

Settlement Performance of Bamboo Dendrocalamus Asper for Improving Peat Soil Reinforcement Stability

Soil reinforcement is the geotechnical application for the soil mass reinforcement elements to increase the shear characteristics of the soil grid. Bamboo is a sustainable source for the wood industry that has been applied in construction soil foundations as a soil reinforcement material. The use of bamboo types Dendrocalamus asper for soft soil reinforcement stability is important and commonly used. Peat, as a very soft soil, is known as problematic soil, and organic soil has poor shear strength and high compressibility. In construction especially for peat soil foundation or subgrade, it has settlement and deformation because of loss of strength. The peat soil from Kampung Puteri Menangis, Benut Pontian Johor has been used in the experimental work to determine the displacement of the settlement performance characteristics without and with the laminated beams of bamboo Dendracalamus asper. Without bamboo, the displacement of the settlement reduces from 22.4% to 6.8% within 1 hour. The use of 1 layer of laminated bamboo reinforcement on the foundation base reduced the displacement of the settlement from 27.2% to 8.9%. The displacement continuesto decrease from 19.3% to 5.8% fortwo layers of laminated bamboo reinforcement, and 18.9% to 5.9% for 3 layers of laminated bamboo reinforcement. At each stage and duration, the peat shows displacement in compression, and the settlement of the reinforcement stability is smaller than in the other stage.

The effect of densification on physical and mechanical properties of bamboo Dendrocalamus asper

The effect of densification on physical and mechanical properties of bamboo Dendrocalamus asper

Wettability and decay of particleboards manufactured with thermally treated sugarcane residue and bamboo (Dendrocalamus asper) particles

Wettability and decay of particleboards manufactured with thermally treated sugarcane residue and bamboo (Dendrocalamus asper) particles

KARAKTERISTIK GLULAM BAMBU BETUNG (Dendrocalamus asper) MENGGUNAKAN PEREKAT STYROFOAM BERDASARKAN JUMLAH LAPISAN DAN POLA PENYUSUNAN

Bamboo is one of the non-timber natural forest products that has the potential to be used as raw material for wood substitutes because bamboo has many advantages. If for wood with high durability, it takes time from planting seedlings to be ready for harvest is 30-40 years and even then after cutting down the seeds must be planted again, but bamboo takes up to 4-5 years to be ready to be harvested. The problem that arises is that bamboo has a limited dimension so that it requires lamination technology that can shape bamboo into a dimensioned material according to construction needs. Lamination technology is an alternative way of processing bamboo that is relevant to achieving the expected goals. Lamination can make the strength of betung bamboo far higher than solid wood blocks. Tests carried out by physical and mechanical tests of betung bamboo lamination using JAS 234: 2003. Testing the physical properties of the betung bamboo includes a wood density test for moisture content testing, and thickness swelling. The mechanical properties of the betung bamboo include the modulus of repture and modulus of elasticity tests. The lamination test has variations in the number of layers A1 (3 layers), A2 (5 layers), and A3 (7 layers) with 3 replications each. betung bamboo density obtained an average of 0.316 gr/cm3 to 0.453 gr/cm3, the average moisture content of betung bamboo was 11.386% to 12.444%, and the average thickness swelling test was 0.240% to 0.293%. Modulus of repture test is 210,160 kg/cm2 to 925,963 kg/cm2, and the modulus of elasticity test shows an average of 0.916 kg/cm2 to 925,963 kg/cm2. The physical properties of the betung bamboo (Dendrocalamus asper) meet the JAS 234: 2003 standard is the moisture content, for the density and thickness swelling bamboo betung lamination is not required in the JAS 234: 2003 standard. The mechanical properties of betung bamboo laminate for MOE values are equivalent to wood strength classes II-IV and MOR are equivalent to wood strength classes V

KARAKTERISTIK GLULAM BAMBU BETUNG (Dendrocalamus asper) MENGGUNAKAN PEREKAT STYROFOAM BERDASARKAN JUMLAH LAPISAN DAN POLA PENYUSUNAN

Bamboo is one of the non-timber natural forest products that has the potential to be used as raw material for wood substitutes because bamboo has many advantages. If for wood with high durability, it takes time from planting seedlings to be ready for harvest is 30-40 years and even then after cutting down the seeds must be planted again, but bamboo takes up to 4-5 years to be ready to be harvested. The problem that arises is that bamboo has a limited dimension so that it requires lamination technology that can shape bamboo into a dimensioned material according to construction needs. Lamination technology is an alternative way of processing bamboo that is relevant to achieving the expected goals. Lamination can make the strength of betung bamboo far higher than solid wood blocks. Tests carried out by physical and mechanical tests of betung bamboo lamination using JAS 234: 2003. Testing the physical properties of the betung bamboo includes a wood density test for moisture content testing, and thickness swelling. The mechanical properties of the betung bamboo include the modulus of rupture and modulus of elasticity tests. The lamination test has variations in the number of layers A1 (3 layers), A2 (5 layers), and A3 (7 layers) with 3 replications each. Betung bamboo density obtained an average of 0.316 gr/cm3 to 0.453 gr/cm3, the average moisture content of betung bamboo was 11.386% to 12.444%, and the average thickness swelling test was 0.240% to 0.293%. Modulus of rupture test is 210,160 kg/cm2 to 925,963 kg/cm2, and the modulus of elasticity test shows an average of 0.916 kg/cm2 to 925,963 kg/cm2. The physical properties of the betung bamboo (Dendrocalamus asper) meet the JAS 234: 2003 standard is the moisture content, for the density and thickness swelling bamboo betung lamination is not required in the JAS 234: 2003 standard. The mechanical properties of betung bamboo laminate for MOE values are equivalent to wood strength classes II-IV and MOR are equivalent to wood strength classes V

Chloride Salts of Triethyl- and Benzyl-Triethyl-Ammonium: A New Antifungal for Giant Bamboo <i>(Dendrocalamus asper) </i>Preservation

In this study, quarternary ammonium salts based on triethylammonium and benzyltriethylammonium cations with the anion of chloride are successfully used for giant bamboo (Dendrocalamus Asper) preservation. These salts are new biocides as well as new salts which penetrate bamboo well. The prepared salts with hydrogen and benzyl substituent at the cation and consisted of chloride anion, exhibited fungicidal activity against Aspergillus Flavus. The effective and lethal doses were measured by the agar-plate method. In their activity against bamboo degrading fungi, salt of benzyl-triethyl-ammonium chloride was comparable with commercially available benzalkonium chloride and didecyldimethylammonium. Keywords: Triethylammonium, Benzyltriethylammonium, chloride, antifungal, and giant bamboo (Dendrocalamus Asper) and Aspergillus Flavus

Pengaruh Variasi Bentuk Potongan Agregat Bambu Petung Terhadap Berat Jenis dan Kuat Tekan Beton Ringan

The use of bamboo as an aggregate substitution is an effort to reduce the specific gravity of concrete, especially in the production of lightweight concrete. The use of bamboo material has the consequence of decreasing the compressive strength value of concrete. This study aims to determine the magnitude of the effect of the use of bamboo substitution on concrete on the compressive strength and specific gravity values. The bamboo material used is sized 15-30 mm in various shapes. The type of bamboo used is petung bamboo (Dendrocalamus Asper). As for the variations in the use of bamboo in the test specimens are 50% and 75% pieces of bamboo of the same shape, 50% and 75% pieces of bamboo form variations, of the weight of coarse aggregate. The research sample is in the form of a cube test object with a size of 15 cm x 15 cm x 15 cm. Based on the results of the study there was a decrease in the value of the concrete mortar slump along with the addition of the percentage of bamboo aggregate substitution. Concrete absorbs water which is indicated by an increase in water absorption in concrete test specimens which reaches 4.81%. The decrease also occurs in the specific gravity and compressive strength of the test specimen. The minimum value of average concrete density with bamboo substitution for various variations was obtained at 1902.2 kg/m3 (Bamboo Test Objects with Variation Shape 75%), and a maximum of 1991.1 kg/m3 (Bamboo Test Objects with 50% Equal Shape and Objects Bamboo Test Variation in the Form of 50%). The maximum compressive strength value is 135.1 kg/cm2 (Bamboo Test Objects of the Same Shape of 50%) and a minimum of 104.4 kg/cm2 (Bamboo Test Objects of 75% Variation Shape). Variations in the shape of bamboo pieces do not have much effect on the compressive strength of concrete.

Phytomodulatory effects of fresh and processed shoots of an edible bamboo Dendrocalamus hamiltonii Nees & Arn. Ex Munro on antioxidant defense system in mouse liver

Bamboo shoots are highly nutritious and a potential rich source of antioxidants and bioactive compounds. Besides nutrients, shoots also contain an anti-nutrient, cyanogenic glucosides accounting for its acrid taste that needs to be removed by adequate processing prior to consumption. However, processing can alter the value of phytochemicals with either desirable or adverse effects on the therapeutic quality of shoots. To evaluate the effects of processing, we investigated the effect of fermented, brine preserved and boiled shoots of Dendrocalamus hamiltonii on antioxidant defense system in mouse liver. Glutathione content increased significantly in the liver tissues of all the groups administered with bamboo shoots extract except the mice that received brine preserved shoots extract, where content decreased by 19%. Glutathione reductase (21%), glutathione peroxidase (20%) and catalase (69%) activity decreased significantly in the group administered with the extract of fresh shoots. The fermentation process was recognized as the most valuable process to improve the activity of hepatic superoxide dismutase (23%), glutathione peroxidase (27%) and catalase (29%).

Preparation and Characterization of Carbon from Petung Bamboo (<i>Dendrocalamus asper</i>) and Ori Bamboo (<i>Bambusa arundinacea</i>) by Carbonization Heat Treatment

Bamboo is an interesting renewable material. Bamboo was used as a source to produced carbon black. This study was using Petung Bamboo (Dendrocalamus asper) and Ori Bamboo (Bambusa arundinacea) as a source of carbon. Carbon black was formed from bamboo through carbonization heat treatment at low temperature in air atmosphere (without inert gas). Carbonization heat treatment was done through gradual heating. The achieved bamboo carbon black was examined. In air atmosphere, bamboo carbon black was formed through slow heating at 300 °C and burned at rapid heating. The yield of bamboo carbon from Petung Bamboo was higher than Ori Bamboo. X-ray diffraction (XRD) results showed amorphous structure of the carbon. Scanning Electron Microscopy (SEM) observation showed that bamboo carbon has fiber and cell structure containing pore. BET results showed that surface area increased with increasing carbonization temperature. Bamboo carbon has high calorie value. Thermogravimetric Analysis (TGA) results showed that degradation temperature increased with increasing carbonization temperature.

Bio-coal production with agroforestry biomasses in Brazil

Pyrolysis is a promising technology for thermal conversion of lignocellulosic biomass into a higher added value fuel. The aim of this study was to analyze the potential of four agroforestry biomass to produce energy as a raw material or as a bio-coal. In this study, slow pyrolysis was conducted in three final temperatures to evaluate the bio-coal production of four agroforestry biomasses widely available in Brazil. The biomass used was sugarcane bagasse (Saccharum sp.), bamboo (Dendrocalamus giganteus), straw bean (Phaseolus vulgaris) and eucalypts wood chips (Eucalyptus sp.). In the first part was presented the raw biomasses proprieties, such as lignin, carbon, hydrogen and ash content. In the second part was showed the bio-coal proprieties, such as, gravimetric and fixed carbon yield, fixed carbon and ash content. These bio-coal results were showed as a function of final temperature of pyrolysis. The best energy indicators for bio-coal production, such as fixed carbon yield, high heating value, was found in the bamboo and eucalypts. The bagasse and straw bean biomasses possess high concentrations of ash and low lignin content when compared with the other biomasses assessed and are less suitable to produce bio-coal.

Ecology of litterfall production of giant bamboo Dendrocalamus asper in a watershed area

Giant bamboo Dendrocalamus asper is recommended in environmental and livelihood programs in the Philippines due to its various ecological, economic and social benefits. However, there are limited data on the ecology of giant bamboo litterfall production, which contributes to soil nutrient availability. Bamboo also contributed in carbon sequestration. The study was conducted within the Taganibong Watershed in Bukidnon, Philippines. Nine litterfall traps measuring 1mx1m were established within the giant bamboo stand in the study area. Results show that giant bamboo litterfall is dominated by leaves. Biological characteristics of bamboo litterfall do no not influence litterfall production but temperature, wind speed and humidity correlate with the amount of litterfall. Findings of the study further revealed that fresh giant bamboo tissue contains high carbon content and the soil in the bamboo stand has higher organic matter than the open clearing. These data indicate the role of giant bamboo in carbon sequestration and soil nutrient availability.

Monthly variations of phytoliths in the leaves of the bamboo Dendrocalamus ronganensis (Poaceae: Bambusoideae)

Phytolith assemblages in plant leaf tissues can vary in response to seasonal climatic conditions and to their biosynthetic formation mechanisms. They therefore have potential ecological and environmental significance. Bamboo, a widely distributed plant, is an important ecological indicator because it produces some characteristic phytoliths. Assemblages of phytoliths in fresh leaves of the bamboo Dendrocalamus ronganensis were studied over a 21-month period to explore for links between them and plant growth and investigate their responses to seasonal climate changes. The results show that phytolith assemblages vary throughout the growing season, that the variations in phytolith assemblages are related to the age and/or maturity of plant leaves, and that leaf phytolith assemblages are influenced by physiology of cells and/or seasonal climatic changes. This work is helpful to understand the mechanisms of phytolith formation and to provide a theoretical basis for using phytoliths as a tool in palaeoenvironmental reconstructions.

Local records of long-term dynamics of bamboo gregarious flowering in northern Laos and regional synchronicity of Dendrocalamus membranaceus in two flowering sites

Bamboos are widely distributed in mainland Southeast Asia and have abundant biomass. They are characterized by prolonged vegetative growth and semelparity. Where bamboos are dominant, their synchronous flowering and death has a major impact on forest vegetation. Although the small-scale dynamics of this process have become clearer in recent years, the history, geographical scale and synchronicity of bamboo flowering over broad areas remains unknown. This study focused on the flowering history of six bamboo species, Bambusa tulda, Cephalostachyum virgatum, Dendrocalamus hamiltonii, Dendrocalamus membranaceus, Indosasa sinica and Oxytenanthera parvifolia, over 40 years across a broad area of northern Laos. We also examined the synchronicity of flowering in D. membranaceus. We visited 49 villages in northern Laos and surveyed knowledgeable inhabitants about bamboo flowering history. The timing, scale and synchronicity of gregarious flowering varied among species. D. hamiltonii and D. membranaceus showed higher flowering synchronicity than other species. All the species except I. sinica had both sporadic and gregarious flowering traits, and showed conspicuous variability in their flowering scale. The flowering bamboo population at two gregarious flowering sites for D. membranaceus was surveyed. While this species had the highest synchronicity in this study, its synchronicity was lower than other species in previous studies worldwide. We found that the gregarious flowering of bamboos in northern Laos over the last 40 years showed lower synchronicity than bamboo flowering reported in other areas of the world. The historical dynamics and scale of bamboo flowering must be further clarified to understand the vegetation composition of this area.

Properties of laminated bamboo produced with the involvement of supercritical carbon dioxide treatment

Supercritical carbon dioxide (SC-CO2) as a carrier solvent is becoming an alternative and environmentally sound method in the preservative treatment of wood and wood-based products. The potential of this new method has never been explored for its suitability in manufacturing laminated bamboo products which are widely used as construction materials for either indoor or outdoor purposes. The current study was aimed at examining the effect of SC-CO2 impregnation on the density and bonding strength of laminated bamboo Dendrocalamus asper. Samples of bamboo strip and their laminated products were prepared for impregnation treatments. Some of the bamboo samples were also proportionally divided into four outer-inner sections for the determination of anatomical structure presumed to have a relationship with the properties of laminated products. SC-CO2 impregnation was conducted in a vessel at the temperature of 35 °C and the pressure of approximately 8 MPa for 30 min. Results showed that SC-CO2 impregnation resulted in no adverse effects on the density and bonding strength of laminated bamboo. Various responses of laminated bamboo products to the SC-CO2 impregnation were noticed to associate with the decreased proportions of vascular bundles and the increased proportions of parenchyma cells from outer to inner parts of the bamboo. These results indicate the feasibility of the SC-CO2 treatment and the important of considering the anatomical structure of bamboo in producing laminates with high strength and durability properties.

Effects of Temperature and Time of Carbonization on the Properties of Bamboo (Dendrocalamus asper) Carbon

Lignocellulosic materials such as wood and bamboo have special characteristics when carbonized at high temperature. For example the electrical conductivity of wood and bamboo increases when carbonized at temperature of 800°C or higher. This property can be used for developing smart materials such as fiber reinforced concrete which has function as sensors for load, damage or temperature. In this experiment, betung bamboo (Dendrocalamus asper) was carbonized at different temperatures and times of carbonization. The purpose of this experiment was to observe the effect of temperature and time of carbonization on the properties of bamboo carbon. Bamboo in the form of particles were carbonized at temperature of 400°C for 300 min and continued at temperatures of 700, 800, or 900°C for 45, 60, or 90 min. Carbon properties such as yield, fixed carbon, volatile matters, and ash content were determined. Structure properties were studied by X Ray Diffraction (XRD), morphological properties were observed by Scanning Electron Microscope (SEM), and electrical conductivity was measured using LCR meter. Result shows that increasing temperature and time of carbonization have significant effects on the structure and other properties of bamboo carbon. Carbonization at temperature of 800°C for 60 min was considered as an optimum condition.