2020 Vol. 39, No. 2

Display Method:
An Elite Variety of Bambusa wenchouensis ‘Gonghou Provenance’
YUE Jin-Jun, YUAN Na, LIN Feng, YUAN Jin-Ling
2020, 39(2): 1-3.
Abstract(1607) PDF(597)
Abstract:
The Bambusa wenchouensis ‘Gonghou Provenance’ is an elite variety with tall culm,thick culm wall,long internodes,thin branches,fine timber qualities,cold tolerance,and high yield, which has been bred from a large number of provenances. Its adult shoots mostly grow up to a height of 12-16 m,a diameter of 8-10 cm,an internode length of 37-50 cm,and a wall thickness of 16-20 mm. Its annual bamboo productivity can reach above 30 t·hm-2. The bamboo has good properties and long fibers, being good for bamboo plywood and paper making. It has a good cold resistance and can be planted in the northern margin of the adaptive zone of sympodial bamboos. Its main branches are thin, and convenient for culm harvest and transport.
Research Progress of Bamboo Dyeing
YANG Si-qian, WANG Hong-yan, YUAN Shao-fei, LI Qin
2020, 39(2): 4-10.
Abstract(1646) PDF(464)
Abstract:
The bamboo material can obtain rich color and good surface quality through proper dyeing treatment, so as to improve its decorative effect and meet growing aesthetic needs of consumers. How to obtain specific color and good effect is the key to dyeing technology. The advances in bamboo dyeing research were reviewed from the aspects of dyeing theories, characterization methods of dyeing bamboo, process of dyeing with acid and reactive dyes, and various pretreatment methods. Bamboo dyeing study trends were prospected and proposals were put forward.
Effects of Reclamation on the Yield of Phyllostachys edulis Rhizome Shoots
QIU Xin-can, YE Zu-ying, HUANG Wang-hua, ZHOU Xin, WANG Zhi-gao
2020, 39(2): 11-14.
Abstract(1792) PDF(489)
Abstract:
Forest land reclamation and its time had great effects on rhizome shoot yield of Phyllostachys edulis. From 2001 to 2019,Phyllostachys edulis forest land reclamation was carried out in Keqiao District,Shaoxing City. The results showed that the yield of rhizome shoots of Phyllostachys edulis can be significantly increased by full reclamation of the forest land,and the suitable time to reclaim was from late May to early June. The highest yield of rhizome shoots occurred in July,and was relatively lower in Autumn. Further works should study the impact of forest land management and shoot digging methods on the yield of rhizome shoots in different periods.
Preliminary Study on Early Shooting and High Yield Cultivation Technology of Pleioblastus amarus
XIAO Long-hua, WU Bo-lin, HU Biao, LI Chao-de, XUE Xing-fu
2020, 39(2): 15-18.
Abstract(1863) PDF(848)
Abstract:
Xuyong county is rich in Pleioblastus amarus resources, covering an area of more than 40,000 mu. Pleioblastus amarus forests are mainly distributed in Longfeng, Xuyong, Tianchi, Shuiwei, and Lianghe town, their management is extensive, most of them are in a state of desolation, and the economic benefits are very poor. In order to improve the economic benefits of Pleioblastus amarus forests, poverty alleviation and cooperation experts from Zhejiang and Sichuan province carried out an early-shooting and high-yield cultivation technology experiment in Pleioblastus amarus forests in 2019. The experimental forest with an area of 13.6 Mu was established by replacing conventional covering materials with waste bamboo chips. The results showed that the surface soil temperature was obviously increased by the covering waste bamboo chips. The bamboo shoots appeared 77 days earlier than normal control and the shooting period was extended to 82 days. The yield was 24 t·hm-1 and the benefit was 260 thousand Yuan·hm-2. The covering cost was greatly reduced and the economic benefit was improved. The post-coverage waste bamboo chips can be reused as culture medium material of edible fungi under the forests to realize the secondary utilization. A set of early-shooting and high-yield cultivation technology of Pleioblastus amarus was proposed, this may provide a demonstration for farmers to increase their income and overcome poverty in Sichuan Province.
Rhizome Characteristics and Its Age Structure in Phyllostachys edulis Forests under Different Management Types
CHEN Cao, HUANG Hai-yong, GONG Ming, WANG Jun, HOU Shu-fang, JIN Ai-wu
2020, 39(2): 19-24.
Abstract(1649) PDF(467)
Abstract:
Under three different management types of Phyllostachys edulis stands in Zhejiang Province,the characteristics of bamboo rhizomes and their age structure were investigated. The results showed that the rhizome length,diameter and internode length in the shoot-wood dual-use bamboo forest (Class Ⅱ) were greater than those in shoot oriented bamboo forest (Class Ⅰ) and wood oriented bamboo forest (Class Ⅲ). Class Ⅰ had the largest number of rhizomes and the smallest biomass. In terms of age structure,in Class Ⅰ Phyllostachys edulis stands,the largest rhizome length,number and the biomass were found in the 3-4 years old rhizomes,while in class Ⅱ and Class Ⅲ bamboo stands reached the maximum in the 5-6 years old rhizomes. Compared with class I and Class Ⅱ,the rhizome length,number and biomass of class Ⅲ showed a large proportion until 7-8 years old,the proportion of 3-4 years old was relatively low. However,the diameter and internode length of rhizomes showed no significant difference in various ages under the three management types.
High-efficiency Cultivation Techniques for Bamboo Shoots of Phyllostachys edulis in Four Seasons
QIU Xin-can, ZHOU Xin, YE Zu-ying
2020, 39(2): 25-29.
Abstract(1467) PDF(142)
Abstract:
A long-term study was conducted from 2008 to 2018 to explore the high-efficiency cultivation techniques for bamboo shoots of Phyllostachys edulis, in which 12 experimental sites with an area of 2.584 hectares were set up in Keqiao District, Shangyu District and Zhuji City of Shaoxing. Based on the experiment, a set of techniques was developed to produce the bamboo shoots mainly in winter, harvest bamboo shoots also in early spring and midspring, and dig rhizome shoots in summer. The good and poor year management mode was changed into equilibrium years, producing bamboo shoots continuously in the four seasons, and steadily in every year. The above mentioned high-efficiency cultivation techniques of bamboo shoots were summarized and applied to 800 hectares bamboo forests, remarkable benefits have been achieved. The output of bamboo shoots has been increased, agricultural output has been increased, and farmers' income has been improved.
The Occurrence Regularity and Low Pollution Control of Two Species of Bamboo Aphids in Zizhuyuan,Beijing
ZHAI Jing-yu, ZHANG Ran
2020, 39(2): 30-36.
Abstract(1556) PDF(161)
Abstract:
In Zizhuyuan Park,Beijing,covering an area of 45.73hm2,a variety of bamboos have been introduced since 1971. There are 44 species of ornamental bamboo belonging to 12 genera,which are the main landscape plants in the park. In recent years,the occurrence and spread of bamboo aphids not only affect the growth and development of bamboo,but also lead to the leaves lose green and turn yellow,appear rusty spots and fall off,and even cause individual plant death in serious cases,which makes a large area of bamboo forest degrade and affect the landscape effect. Therefore,fixed-site,regular investigation and analysis, were conducted to explore the damage situation and occurrence regularity of two bamboo aphids in Zizhuyuan,Beijing. It was found that the Takecallis taiwanus was harmful to many bamboo species,causing serious damage to the growth and development of Phyllostachys mainly in the park. The pests mainly concentrated on the back of bamboo leaves at the petioles or leaf tips,as well as the shoot tips and tender shoot parts. The damage occurred in 12 months round a year,and May and October were the two peak months. Meanwhile,the Takecallis arundinariae mainly caused serious damage to the growth and development of Phyllostachys bambusoides in the park. Its population mainly concentrated in the middle part of the back of bamboo leaves. July is the peak of the aphid's damage. It had poor activity in winter and overwintered with eggs. The results showed that eco-environmental factors affected the life cycle and quantity of the two aphids. The forecast of the two pests should pay attention to the temperature in Beijing and the microclimate in the park,and scientific management should be carried out in the bamboo growth cycle,including maintaining the appropriate planting density of bamboo forest,rational application of biological agents,protection and utilization of its natural enemies. The aim of this study is to take effective control measures of low pollution before the peak period of aphid occurrence.
The Changes of Density and Porosity of Bamboo Material in the Process of Fiber Rolling
LIU Li, YAO Wen-bin, ZHANG Wei, YU Wei-peng, LIU Yue
2020, 39(2): 37-44.
Abstract(1730) PDF(139)
Abstract:
In order to explore the changes of density and porosity of bamboo in the process of fiber manufacturing, the delamination phenomenon of bamboo cross-section under continuous rolling load was studied by using computer tomography technology, and the influence of rolling times on the porosity and compactness of bamboo was analyzed. The results showed that with the increase of rolling times, the continuous directional fiber manufacturing process of bamboo experienced several stages: morphological destruction, bamboo chip densification, bamboo chip cracking gap and bamboo fiber separation. The changes of different stages can be distinguished by the value of pore density ratio. The bamboo with complete fiber manufacturing had obvious index characteristics in CT value. When the gap ratio of bamboo was more than 80%, the density ratio was less than 5%, and the gap density ratio was greater than or equal to 25, the bamboo slices showed the state of complete fiber bundle separation.
The Optimization of Bamboo Heat Treatment Process
HONG You-you, WENG Fu-jin, PAN Xin
2020, 39(2): 45-50.
Abstract(1848) PDF(267)
Abstract:
In this paper,the heat treatment processes of bamboo,including cooking,bleaching and carbonization,were optimized. The results showed that when hydrogen peroxide was used as bleaching agent and pH was 9,the optimal treatment was obtained under the heat treatment at 70 ℃ for 60 min in 6% bleaching solution,the corresponding bamboo whiteness can increase by more than 12%,the bleaching bath solution for bamboo bundles can be reused for 8 to 10 cycles,and its COD could reach 60,000 mg·L-1. A correlation model between the bamboo whiteness (chromaticity) and the saturated vapor pressure and carbonization time was built. The chromaticity was analyzed by colorimeter.Combined with bamboo carbonization process,the chromatogram of bamboo carbonization process was established to guide the practical production. Compared with the traditional experience of saturated vapor pressure carbonization process,determination of carbonization process by means of prediction,the model can reduce a waste water emission by 11.32%-12.5%.
The Shear Resistance of Wall Panel Made of Wooden Frame Covered by Orthogonal Oblique Placement Bamboo Strips
BAI Wen-feng, BAI Yu, LIANG Yu-ming, LIU Zhong-wei, SU He-xian, LAI Zheng-cong
2020, 39(2): 51-59.
Abstract(1581) PDF(123)
Abstract:
A kind of hybrid panel, which is made of wooden frame covered by orthogonal oblique placement bamboo strips on one side, was tested. In order to explore the response of the panel under vertical and horizontal load, it was destroyed by the pseudo-static action to measure the ultimate horizontal bearing capacity and deformation capacity. Furthermore, the hybrid panel was destroyed by the low cyclic loading to study its seismic bearing capacity, deformation capacity, failure process, hysteretic curve and skeleton curve feature. The results showed that the bearing capacity, stiffness, ductility and energy dissipation capacity of the hybrid panel were much better than the light wood frame construction because of the hybrid effects between bamboo strips and wooden frame. It was feasible to build low-rise buildings by using hybrid panel as load bearing walls in the 8 degree seismic fortification regions.
Evaluation System of Bamboo-wood Toy Production Line Based on Value Engineering
REN Rong-rong, CHEN Si-yu, CHEN Guo-dong, WANG Jun, XIANG Shi-ping
2020, 39(2): 60-65.
Abstract(1490) PDF(39)
Abstract:
Currently, the research on the production line system of bamboo-wood toys is not in-depth enough. In order to help enterprises to quickly and accurately locate the processes with problems in the production line, through the application of value engineering principle, a set of applicable bamboo-wood toy production line evaluation system was constructed, and three parameters, including function, cost and value, were quantified for each process in the production line that has been put into use, so as to find out problems for enterprises and determine the priority of problems that need to be solved. Finally, the feasibility and effectiveness of applying the value engineering principle in the rating mechanism of bamboo-wood toy production line were verified by an example.
Landscape Evaluation and Reconstruction Strategies of Scenic Recreation Bamboo Forests in Southwest China
LIU Ge-yan, WANG Yu-qian, HUANG Yin-shu, SHENG Zhi-yi, HUANG Xiao, CHEN Qi-bin, JIANG Ming-yan
2020, 39(2): 66-73.
Abstract(4004) PDF(197)
Abstract:
Taking the bamboo forest scenic area in Southwest China as the research object, the analytic hierarchy process (AHP method) was used to construct an index system with 5 criterion levels and 20 indicators to evaluate the landscape of scenic bamboo forests. The layer weight is the aesthetic index of the forest (0.2864) > the health index of the bamboo forest (0.2442) > the structure index of the forest (0.1769) > the characteristic index of the understory (0.1663) > the bamboo measurement index (0.1262). The beauty degree evaluation (SBE) was conducted,and the correlation between the category level of the main influencing indicators (visibility, lodging degree, standing bamboo density, understory uniformity, average height under the first branch) in each criterion level and the value of bamboo forest beauty was studied. The results showed that people preferred the bamboo forests with the first branching height above 5.5 m, the bamboo density of 6 000~12 000 plants·hm-2 for scattered bamboos and 700~1 100 clusters·hm-2 for clumping bamboos, and almost no lodging or lodging number ≤2 plants, neat understory,and visibility more than 20 m. Thus, suggestions for improving the landscape of the scenic bamboo forests were proposed.
A Preliminary Study on Bamboo Cultural Identity of College Students
SHI Dong-hui
2020, 39(2): 74-78.
Abstract(472) PDF(40)
Abstract:
Cultural identity is the foundation and source of cultural confidence. The investigation and analysis about bamboo cultural identity of college students showed that college students have an identity based on bamboo culture,and the identity varied with different demographic variables in some specific prospects. Accordingly,it is discussed to strengthen the bamboo cultural identity of college students and enhance the confidence of Chinese culture.
The Influence of Developing Understory Economy of Moso Forests on Rural Revitalization——A Case Study of Quzhou City, Zhejiang Province
XIU Cheng-ming, YU Hai-han, GAI Xu, ZHANG Jia-jia, BIAN Fang-yuan
2020, 39(2): 79-84.
Abstract(532) PDF(72)
Abstract:
Understory economy refers to the multi-layer planting and breeding mode that share the biodiversity resources of agriculture, forestry and animal husbandry, and achieve the sustainable development with complementary advantages. The forest-medicine compound management mode is one of the most characteristic understory economy modes in China, it can achieve the organic combination of ecological, economic and social benefits. In this paper, through field investigation, interview and data analysis, the influence of understory plantation and economy of Moso forests on rural revitalization in Quzhou City, Zhejiang Province were studied. The development status of Chinese herbal medicine under Moso forests, the impact of understory economy and rural tourism on rural revitalization, as well as the problems faced by understory economy were discussed. Combined with the local actual situation, the existing problems were analyzed, and some suggestions and prospects for the understory economy of Moso forests were put forward.
Current Situation and Countermeasures of the Transformation of Wood-bamboo Scientific Research Achievements in National Forestry Research Institutes
YANG Na, YANG Jin
2020, 39(2): 85-88.
Abstract(441) PDF(51)
Abstract:
Through on-the-spot investigation, the present situation and problems on the scientific and technological achievement transformation model, effect and benefit of the national wood-bamboo research institutes were analyzed from the point views of the scientific and technological achievements, application market, patent protection, extension method etc. Some suggestions were put forward to make the transformation regulations and policies to be successfully implemented, and to promote a win-win situation between scientific research and its achievements transformation.
The Application of Bamboo Fiber in Automobile Composites
ZHANG Yi
2020, 39(2): 89-93.
Abstract(552) PDF(91)
Abstract:
Bamboo fiber (natural bamboo fiber, also known as bamboo raw fiber) is a new kind of plant fiber, which is different from chemical bamboo viscose fiber (bamboo pulp fiber, bamboo charcoal fiber). As a basic material with excellent performance, bamboo fiber can be widely used in the production of composite materials such as textile, nonwoven, building materials and automobile materials. The development of lightweight reinforced composites is an important trend to achieve lightweight. Nevertheless, the cost of commonly used carbon fiber reinforced composite material is high. Although the glass fiber modified composite technology is the most mature, there are some limitations, such as low toughness, high brittleness, high mechanical wear, high energy consumption, easy water absorption, coarseness, non-degradation, and difficult to be disposed. It is found that the bamboo fiber composite prepared with the natural environment-friendly bamboo fiber as the reinforcing material has the characteristics of low density, high modulus and high strength, which is very suitable for the lightweight of automobile parts. Compared with traditional composite materials, bamboo fiber composite materials are lighter in mass, less in energy consumption, and emit very low carbon throughout their life cycle, which is more in line with the requirements of "green environmental protection and low carbonization" in modern society.