2021 Vol. 40, No. 4

Display Method:
Thermal Efficiency Analysis and Energy Saving Suggestions for Bamboo Chip Boiler Based on Test Data
LUO Xian-shou
2021, 40(4): 1-6. doi: 10.12390/jbr2022047
Abstract(320) PDF(48)
Abstract:
Through the thermal efficiency test of 134 bamboo chip fired boilers,it is found that the qualified rate of thermal efficiency is 53.73%. The test data are analyzed rigorously. The results show that the main influencing factors of low thermal efficiency are excess air coefficient,low qualified rate of exhaust gas temperature,high water content in fuel and combustible content in fly ash. In view of the above influencing factors,energy-saving suggestions are put forward.
Sources, Current Treatments and Research Prospects of Wastewater from Bamboo Processing Industry
WU Wang-jun, WANG Jin, ZHUANG Xiao-wei
2021, 40(4): 7-12. doi: 10.12390/jbr2022023
Abstract(447) PDF(73)
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Through industrial investigation and literature review, this paper analyzes the sources and characteristics of wastewater from bamboo processing industry, including the sectors of bamboo pulping and papermaking, bamboo-based panel, bamboo floor, bamboo daily necessities, bamboo beverage, bamboo fiber products and bamboo charcoal. The existing technologies of wastewater treatment in bamboo processing industry are reviewed. Current research status of wastewater treatment technology in bamboo processing is summarized and the research prospects are discussed.
Improvement of Structural Strength of Furniture Based on Finite Element Analysis
HUANG Peng-fei, LI Fang-fei, ZHANG Lei
2021, 40(4): 13-21. doi: 10.12390/jbr2022016
Abstract(442) PDF(71)
Abstract:
Some universal problems found in the structural strength test of furniture were analyzed using ANSYS finite element analysis software. Pine wood bed was selected as the research subject. According to the test method in the national standard of furniture mechanical properties, the finite element simulation of the concentrated static load test of the bed surface was carried out. The results showed that the pine wood bed did not fulfill the requirements of strength safety. For this reason, the design was optimized to improve the strength. Two methods were investigated:altering the bed structure and substituting the bamboo scrimber as material, and the finite element analysis was performed. It was found that the two methods increased the safety factor to 1.25 and 3.16, respectively. In addition, the use of bamboo scrimber could make furniture lighter under the premise of ensuring strength, and might also alleviate the domestic lumber shortage, hence having broad prospects.
Bambusa liangzhiana, A New Species of Bambusa (Poaceae) from Guangdong, China
NI Jing-bo, TONG Yi-hua, LI Xing, XIA Nian-he
2021, 40(4): 22-27. doi: 10.12390/jbr2022005
Abstract(496) PDF(64)
Abstract:
Bambusa liangzhiana, a new species of B. subg. Bambusa from Guangdong, China, is described. This new species is morphologically similar to B. funghomii and B. sinospinosa in branchlets on basal part of culm forming tough, sharp, curved thorns and relatively large culm leaf auricles, but differs in basal part of culm being straight, internodes, culm leaf sheath and sheath scar being glabrous, and culm leaf auricles being erect and obliquely ovate or ovate-oblong, hirtellous on both sides and protruding from the sheath margin prominently. A colour plate and a line-drawing of this new species are also provided.
Research on Main Construction Modes of Bamboo Scenery
ZHU Zhi-xian, CHEN Qi-bing, WU Lin-jia, JIANG Wen-yuan
2021, 40(4): 28-36. doi: 10.12390/jbr2022017
Abstract(279) PDF(42)
Abstract:
In order to further implement the construction of bamboo landscape, this paper investigated the first 13 bamboo landscape construction projects in Sichuan Province. Based on literature review and field study, GIS technology was applied to classify and grade its construction elements, and 4 element layers and 15 factor layers were obtained. They were ecological base layer (importance of ecosystem service function, ecological sensitivity, drainage, slope and elevation), industrial development layer (primary industry, secondary industry and tertiary industry), cultural facilities layer (important interchange station and road traffic network), and landscape pattern layer (fragmentation, isolation, fragility, dominance and interference). Entropy method was used to calculate the weights of different elements, and it was found that the importance rankings were as follows, ecological base layer (0.390) > industrial development layer (0.280) > cultural facilities layer (0.210) > landscape pattern layer (0.120). Moreover, the weights of factors in different elements were different. Results indicated that the existing bamboo landscape was mainly built on four concepts, that is, "ecology, industry, culture and landscape", of which ecology accounted for largest proportion, while ecology and landscape were usually associated elements. Therefore, it is concluded that there are three categories of construction modes of bamboo landscape, namely, "landscape ecology", "industrial development" and "cultural guidance". Based on the idea of "investigation, analysis and understanding", this study provides a more rigorous and systematic direction for the construction of bamboo landscape in China, and also facilitates the improvement of research system on bamboo landscape.
Application of Bamboo Plants in Rural Landscape Construction in Chishui City
YANG Xiu-tian, DONG Wen-yuan, DENG Tian-ji, CHEN Lin, GUO Xiao-hong
2021, 40(4): 37-43. doi: 10.12390/jbr2022020
Abstract(394) PDF(55)
Abstract:
The landscape application of bamboo plants plays an increasingly important role in the creation of livable villages and the improvement of rural living environment. Based on the analysis of the current situation of bamboo resources and the application status of rural landscape in Chishui City, Guizhou Province, with an emphasis on the existing problems of bamboo plants in rural landscape construction, this paper proposes to transform the management mode of bamboo forests, strengthen the construction of characteristic landscapes, match the sites with suitable bamboo species, promote the functions of leisure and wellness, and underscore the selection of ornamental bamboo species. These measures are of great theoretical and practical significance for creating impressive scenery of bamboo forests and fostering poetic rural communities featuring the beauties of ecology, economy and human life.
Research Progress and Development Trend of Dietary Fiber from Bamboo Shoots
LI Yun-qin, ZHAO Yi-he
2021, 40(4): 44-49. doi: 10.12390/jbr2022035
Abstract(538) PDF(170)
Abstract:
Dietary fiber has a variety of physiological activities and health beneficial functions and is widely developed and utilized. Bamboo shoots are rich in dietary fiber resources. In this paper, the extraction and modification methods and application status of dietary fiber from bamboo shoots (including by-products such as shoot head and shell) in China were reviewed. It can provide a reference for the efficient utilization of by-products of bamboo shoots and the industrialized development and utilization of dietary fiber from bamboo shoots.
Advances in Studies on Nutrient Composition Changes of Bamboo Shoots after Harvest
DONG Chun-feng, Li Qin
2021, 40(4): 50-55. doi: 10.12390/jbr2022039
Abstract(256) PDF(118)
Abstract:
In this paper, the nutritional compositions of bamboo shoots at home and abroad in recent years were reviewed, mainly focusing on amino acids, proteins, dietary fiber, ash and mineral elements, etc. The contents of these nutrients in different types of bamboo shoots were described, and compared with common vegetables. It provides the theoretical and scientific basis for the nutritional value of bamboo shoots. In addition, the variation trend of nutrition composition of bamboo shoots after harvest was expounded, and the importance of storage and preservation of bamboo shoots after harvest was explained.
Effects of Mulching on Soil Nutrients of Moso Bamboo Plantation
WANG Hai-xia, ZENG Qing-nan, CHENG Ping, HAN Wei
2021, 40(4): 56-60. doi: 10.12390/jbr2022012
Abstract(283) PDF(117)
Abstract:
Soil nutrients of Moso bamboo plantation with mulching for 3 consecutive years were analyzed. The results showed that the contents of soil total nitrogen, total phosphorus, total potassium, available nitrogen and available phosphorus increased in 1st and 2nd years and then decreased in 3rd year. The content of available potassium increased continuously, while the contents of organic matter and mineral elements decreased continuously. There was a strong positive correlation between the contents of available nitrogen and phosphorus and the contents of total nitrogen and phosphorus. There were various degrees of correlation between the content of organic matter and those of nitrogen, phosphorus and potassium. The content of organic matter had a significant positive correlation to the content of available potassium, a significant negative correlation to those of total phosphorus and available phosphorus, and a weak negative correlation to the contents of nitrogen and total potassium.
Effects of Different Treatments on the Structure and Functional Properties of Dietary Fibers from Bamboo (Dendrocalamus hamitonii) Shoots
LI Xiu-fen, ZHAO Bing, ZHAO Yi-he, LI Qin, HE Jin-song
2021, 40(4): 61-68. doi: 10.12390/jbr2022042
Abstract(287) PDF(107)
Abstract:
The effects of different extraction methods on the composition, structure, physical and chemical properties of dietary fibers from bamboo (D. hamitonii) shoots were studied. Hot water extraction, water extraction after drying, water extraction after fermentation, and water extraction after fermentation and drying were used to prepare four dietary fibers from bamboo shoot. By analyzing the dietary fiber content, monosaccharide composition, chemical structure, micro-morphology, color changes, and functional properties of the extracts, the effects of four extraction treatments on the structure and functional properties of the dietary fibers were evaluated. Results showed that increased total dietary fiber, whiter color, undulate microstructure and higher water holding capacity and swelling capacity were observed in the dietary fibers extracted after fermentation. A dramatic increase in the yellow color was observed in dietary fibers extracted after drying treatment and the microstructure of the dietary fibers was altered to some extent through drying treatment. The structure and functional properties of the dietary fibers were affected by both drying treatment and fermentation treatment. The results of this study are of great significance to understand the structure and functional properties of dietary fibers extracted from bamboo shoot.
Cultivation Technology of Square-shaped Moso Bamboo (Phyllostachys edulis)
FAN Wei-qing, HUANG Ming-wen, XIE Ai-xiang, LAN Ben-kuan, BI Ya-ying, ZHOU Cheng-min
2021, 40(4): 69-73. doi: 10.12390/jbr2022052
Abstract(294) PDF(42)
Abstract:
In order to study the growth of Moso bamboo (Phyllostachys edulis) shoots in the molds with different light and air permeabilities, stainless steel square-shaped sleeve molds with thicknesses of 0.12 cm, 0.15 cm and 0.18 cm and height of 200 cm were used as confinement for bamboo shoots and pores of various sizes were spotted on the walls of molds. The culm morphology, internode growth and DBH changes of young bamboo plants were analyzed and compared. The results showed that when the thickness of the steel plate was 0.12 cm, the junction of the two mold pieces fixed by screws was slightly protruded. The average internode length was 11.76 cm with mold pores of 1.5 cm in diameter, and 13.33 cm with pores of 3.0 cm in diameter, a decrease of 29.45% and 20.04% compared to the control of 16.67 cm, respectively. There was significant difference between treatments (P<0.01). The average number of culm nodes was 17 with mold pores of 1.5 cm in diameter, and 15 with pores of 3.0 cm in diameter, an increase of 41.67% and 25.00% compared to the control of 12, respectively. There was significant difference between treatments (P<0.05). The average height of bamboo culms was 110.53 cm with mold pores of 1.5 cm in diameter and 152.57 cm with pores of 3.0 cm in diameter, a decrease of 46.63% and 26.33% compared to the control of 207.10 cm, respectively. There was significant difference between treatments (P<0.01). There was no significant difference in DBH between treatments. Therefore, steel plates with a thickness larger than 0.12 cm should be used to make molds for the cultivation of square-shaped Moso bamboo. Then, according to the needs, crafted bamboo culms of various specifications can be cultivated by adjusting the size of the mold pores, selecting the thickness of bamboo shoots and choosing the proper dimension of the molds.
Effects of Different Fertilization Modes on Soil Physico-chemical Properties and Bamboo Shoot Growth of Dendrocalamus giganteus Munro
ZHU Li-yue, LIU Wei-yi, HUI Chao-mao, TU Dan-dan, ZHANG Wen-jun
2021, 40(4): 74-79. doi: 10.12390/jbr2022036
Abstract(286) PDF(50)
Abstract:
To study the effects of different fertilization modes on soil physico-chemical properties and bamboo shoot growth of Dendrocalamus giganteus, five fertilization treatments were performed, including organic fertilizer (A), compound fertilizer (B), bamboo cavity fertilizer (C), green fertilizer (D) and no fertilization (CK) as the control group. The results showed that the application of compound fertilizer and organic fertilizer significantly improved the soil physico-chemical properties. Compared with no fertilization, the application of organic fertilizer substantially increased the soil maximum water holding capacity and the contents of organic matter, total nitrogen, total phosphorus and available phosphorus. While the application of compound fertilizer significantly increased the soil minimum water holding capacity and the contents of total phosphorus, total potassium, available phosphorus and available potassium. Furthermore, bamboo cavity fertilizer and green fertilizer significantly affected the contents of soil hydrolytic nitrogen and available phosphorus, but had little impact on other soil physico-chemical properties. Applying compound fertilizer, organic fertilizer and bamboo cavity fertilizer evidently enhanced the diameter at breast height (DBH) of D. giganteus, and the compound fertilizer had the most notable effect. Therefore, by evaluating the improvement of soil physico-chemical properties, the average DBH of new culms and the survival rate of D. giganteus, it is concluded that the application of compound fertilizer in short-term has the most positive effects on the growth of D. giganteus.
Effects of Storage Time and Temperature on Postharvest Quality of Dendrocalamus brandisii Shoots
DONG Chun-feng, ZHAO Yi-he
2021, 40(4): 80-86. doi: 10.12390/jbr2022040
Abstract(254) PDF(99)
Abstract:
In order to unravel the effects of storage time and temperature on the quality of Dendrocalamus brandisii shoots after harvest, the plant chemical analysis was performed to determine the contents of proteins, reducing sugars, ash, lignin, total phenols and flavonoids in bamboo shoots at different storage times (0, 12, 24, 36, 48, 60 and 72 h) and at different storage temperatures (0℃, 4℃ and room temperature as control). The results showed that at different storage times and temperatures, the contents of proteins and reducing sugars decreased, while the contents of lignin, crude fibers and ash increased. The amount of dietary fibers decreased at low temperature but increased at room temperature. The content of total phenols fluctuated, but the fluctuation was more severe at room temperature. The flavonoid content showed an upward trend, but it accumulated more at room temperature. The polysaccharide content displayed a downward trend, but it decreased more drastically at room temperature. These results provide a theoretical basis for postharvest storage and preservation of Dendrocalamus brandisii shoots in future.
Impacts of Clump Logging on Growth Dynamics and Economic Benefits of Bamboo (Dendrocalamus giganteus) Forest
TU Dan-dan, HUI Chao-mao, LIU Wei-yi, ZHU Li-yue, ZHANG Wen-jun
2021, 40(4): 87-92. doi: 10.12390/jbr2022034
Abstract(223) PDF(50)
Abstract:
In order to address the problems of poor economic returns and soaring labor costs with traditional logging of Dendrocalamus giganteus forests, which are widely distributed in Yunnan Province of southwest China, four logging practices of different intensities were investigated, including conventional selective logging, 1/3 clump logging, 1/2 clump logging and whole clump logging. The regeneration of bamboo culms after logging was studied to determine the best logging mode for D. giganteus forests. The results showed that there were significant differences in shoot emergence, survival, DBH, and other indicators between different logging practices. The overall shoot emergence and survival rates displayed an upward-then-downward trend with the increase of logging intensity. After a respite of three years, the bamboo forests could basically recover to the pre-logging level. Furthermore, clump logging could boost the economic benefits of bamboo. The results demonstrated that the clump logging was feasible in the management of the bamboo forests. According to the analysis of overall ecological and economic benefits of bamboo forest restoration, the optimal logging mode was 1/2 clump logging.
2021, 40(4): 93-93.
Abstract(165) PDF(29)
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