scholarly journals Study on Modification of Fast-growing Chinese Fir Stumpage

2018 ◽  
Vol 108 ◽  
pp. 042084 ◽  
Author(s):  
Yong Wang ◽  
Layun Deng ◽  
Shiqing Chen ◽  
Zejun Chen ◽  
Youhua Fan
Keyword(s):  
Chinese Fir ◽  
Fast Growing

scholarly journals The relationships between water storage and biomass components in two conifer species

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7901 ◽  
Author(s):  
Lai Zhou ◽  
Sajjad Saeed ◽  
Yujun Sun ◽  
Bo Zhang ◽  
Mi Luo ◽  
...  
Keyword(s):  
Water Content ◽  
Water Storage ◽  
Dry Mass ◽  
Chinese Fir ◽  
Tree Level ◽  
Conifer Species ◽  
Individual Tree ◽  
Fast Growing ◽  
Content Ratio ◽  
Significant Difference

Background Water storage is a significant physiological index of vegetation growth. However, information on water storage at the individual tree level and its relationship to climatic conditions and productivity is scarce. Methods We performed a comparative analysis of water storage using field measurements acquired three age classes of Chinese fir (Cunninghamia lanceolata) and Korean larch (Larix olgensis). The distributions of water storage, water content ratio and dry mass were presented, and regression analyses were used to confirm the relationships of water storage and water content ratio to dry mass components, respectively. Results Our results indicated that water was mostly concentrated in the stem xylem, which aligned well with the distribution of dry mass in both conifer species. However, the water storage of the stem xylem was always higher in Chinese fir than in Korean larch. The average water content ratio of both conifer species decreased with age, but that of Chinese fir was always higher than that of Korean larch. There was a significant difference in the water storage proportion in the components of Chinese fir (P < 0.001) and Korean larch (P < 0.001). The effects of age class on the water storage of Chinese fir (P = 0.72) and Korean larch (P = 0.077) were not significant. Interestingly, significant positive linear correlations were found between fine root water and leaf water and mass in Chinese fir (P < 0.001, R2 ≥ 0.57) and Korean larch (P < 0.001, R2 ≥ 0.74). The slopes showing that the linear relationship between tree size and water content ratio of stem xylem were always steeper than that of other components for the two conifers. Conclusion Our study indicates the similar water related characteristics and their close relations to biomass accumulation and growth in both fast growing species at contrasting climates, illustrating the same coherent strategies of fast growing conifers in water utilization.

scholarly journals The Study of Bound Water Status and Pore Size Distribution of Chinese Fir and Poplar Cell Wall by Low-Field NMR

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Huimin Cao ◽  
Jianxiong Lyu ◽  
Yongdong Zhou ◽  
Xin Gao
Keyword(s):  
Cell Wall ◽  
Low Temperature ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Adsorption Isotherms ◽  
Bound Water ◽  
Chinese Fir ◽  
Fast Growing ◽  
Pore Size Distributions

With the increasing shortage of timber resources and the advancement of environmental protection projects, many artificial fast-growing forests are planted and used as raw materials in China. There are significant differences in the properties of natural forest wood and artificial fast-growing forest wood, and the properties of wood mainly depend on the change in the status of bound water in the cell wall. In this study, the fiber saturation point (FSP) and pore size distributions within the cell wall of six species of fast-growing forest wood were studied by low-temperature nuclear magnetic resonance (NMR) technology. The effects of species, growth rings, and extractives on the FSP and pore structure were analyzed. The water vapor sorption experiments were performed, and the adsorption isotherms of the samples were fitted through the Guggenheim-Anderson-de Boer (GAB) equation. According to the least-square regression of the adsorption isotherms and combined with the low-temperature NMR experiments, the content and proportion of the different types of bound water were analyzed. The results showed that the average FSP of each Chinese fir was about 40% and that of each poplar was about 35%. There is about a 10% difference between the FSP measured by NMR technology and the adsorption bound water content obtained by adsorption isothermal. The pore size distribution results show that in all samples, the proportion of pores larger than 10.5 nm is very low, about 10%; the proportion of 1.92-10.5 nm pores is about 30%; and the proportion of pores smaller than 1.92nm is more than 50%. This work will be helpful to the study of the wood moisture status and provide reference data for wood modification.

Study on Dyeing Properties of Acid Dyes for Different Tree Species

2011 ◽  
Vol 58-60 ◽  
pp. 205-208
Author(s):  
Hui Li ◽  
Xin Gong Li ◽  
Wei Min Chen
Keyword(s):  
Tree Species ◽  
Chinese Fir ◽  
Acid Dyes ◽  
Dyeing Properties ◽  
Black Powder ◽  
Fast Growing ◽  
Rubber Wood ◽  
Research Objects ◽  
Acid Color

Use acid scarlet3R ,acid orangeⅡ,acid black ATT and black powder as pigment,prepare for Acid Color, choose four fast growing woods-Chinese fir, poplar, eucalyptus and rubber wood as research objects, study on dyeing properties and dyeing effects of acid dyes for different tree species. It is found, there are differences in staining effects for four fast growing woods. Attachment properties of dyestuff solution on Chinese fir is good, but dyes proportion is very poor; Attachment properties of dyestuff solution on poplar is good, but dyes proportion is very poor; Both attachment property of dyestuff solution and dyes proportion of eucalyptus are not good; Both attachment property of dyestuff solution and dyes proportion of rubber wood are good.

scholarly journals Improving the Properties of Fast-Growing Chinese Fir by Vacuum Hot Pressing Treatment

2021 ◽  
Vol 9 (1) ◽  
pp. 49-59
Author(s):  
Lu Hong ◽  
Biqing Shu ◽  
Qian He ◽  
Zehui Ju ◽  
Haiyang Zhang ◽  
...  
Keyword(s):  
Hot Pressing ◽  
Chinese Fir ◽  
Fast Growing ◽  
Vacuum Hot Pressing

Several Important Diseases of Chinese Fir Plantations and their Control Measures

2011 ◽  
Vol 480-481 ◽  
pp. 727-732
Author(s):  
He Li ◽  
Guo Ying Zhou
Keyword(s):  
Disease Control ◽  
Southern China ◽  
Chinese Fir ◽  
Control Measures ◽  
Cunninghamia Lanceolata ◽  
Timber Species ◽  
Healthy Development ◽  
Fast Growing ◽  
Important Basis ◽  
Chinese Fir Plantation

Chinese fir (Cunninghamia Lanceolata) is a unique fast growing merchantable timber species in China with good materials, and is a major fast growing timber species in provinces of southern China. With the increase in Chinese fir plantation areas and the improvement in the degree of pure forests, the diseases of Chinese fir are increasing and their damages are getting worse, which have caused great losses and affected the sustainable, rapid and healthy development of forestry in China. This article gives a description of pathogenies, symptoms and occurrence regularities of four important diseases of Chinese fir, including Glomerella cingulata, Pestalotia Sp., Pseudomonas cunninghamiae and Chlorosis, and puts forward the corresponding control measures of these diseases, which provides an important basis for disease control of Chinese fir plantations.

Fast-Growing China's Hydropower Systems and Operation Challenges

2011 ◽  
Author(s):  
Chun-Tian Cheng ◽  
K. W. Chau ◽  
Xin-Yu Wu ◽  
Jian-Jian Shen
Keyword(s):  
Fast Growing

Modern university as an economic growth driver: Models & missions

2017 ◽  
pp. 58-76 ◽  
Author(s):  
A. Karpov
Keyword(s):  
Economic Growth ◽  
Education Research ◽  
Advanced Technology ◽  
Global Competitiveness ◽  
Technology Markets ◽  
Fast Growing ◽  
Business Ecosystem ◽  
Cost Efficient ◽  
National Economies ◽  
The University

The paper considers the modern university as an economic growth driver within the University 3.0 concept (education, research, and commercialization of knowledge). It demonstrates how the University 3.0 is becoming the basis for global competitiveness of national economies and international alliances, and how its business ecosystem generates new fast-growing industries, advanced technology markets and cost-efficient administrative territories.

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