Genetic variation of ten Norway spruce (Picea abies (L.) Karst.) clones regarding their decay resistance against brown rot fungi, as well as physical and chemical properties of clones were investigated. 31- year-old s...Genetic variation of ten Norway spruce (Picea abies (L.) Karst.) clones regarding their decay resistance against brown rot fungi, as well as physical and chemical properties of clones were investigated. 31- year-old spruce clones: 26, 31, A10, A15, A7, B10, B15, B6, V7, V9 were selected across Latvia. The stem diameters of spruce clones varied between 13.0 and 20.9 cm. The wood density of clones ranged from 361 to 443 kg/m3. Klason lignin content, depending on the clone, was between 27.0%-28.9%. Cellular UV microspectrophotometry of the non-infected tracheids displayed the typical lignin distribution with highest absorbance values in the cell corners (abs280 nm 0.80) and compound middle lamellae (abs280 nm 0.48), while secondary wall showed lower lignin absorbance values (abs280 nm0.29 - 0.35). The deposition of phenolic extractives in ray parenchyma and epithelial cells of resin canals were emphasized by a significantly higher UV-absorbance (abs280 nm 0.68 to 0.78) when compared to the cell wall associated lignin. The content of acetone-soluble extractives of spruce clones varied between 1.1% - 1.8%. The x-value (natural durability) for all spruce clones after exposure to C. puteana and P. placentawas >0.90 (durability class 5, not durable). Most of clones after degradation by G. trabeum had x-value > 0.90 with exception of clones B15 and V9 that showed x-value ≤ 0.90 (durability class 4, slightly durable). Natural durability of spruce clones did not correlate with stem diameter, density, content of lignin and extractives.展开更多
木材是大自然馈赠给人类最美好而实用的生态材料,是可再生的天然资源。木材以其特有的属性为人类文明和生态环保作出了巨大贡献。"木材真好"("Wood is Good")应成为木材相关行业和活动的基础理念。鉴于木材显著的...木材是大自然馈赠给人类最美好而实用的生态材料,是可再生的天然资源。木材以其特有的属性为人类文明和生态环保作出了巨大贡献。"木材真好"("Wood is Good")应成为木材相关行业和活动的基础理念。鉴于木材显著的社会、文化、艺术属性,《国际木业》本年度设立"环球木文化"栏目,通过此栏目给读者更广阔的视角认识木材。"国际木文化学会"是最早用文化的方法去推广"木材真好"这个理念的一个全球非盈利性组织。"国际木文化学会"在2010年提出并倡议每年3月21日为"世界木材日"。"世界木材日"至今已连续举办了四届,上百个国家与木材相关的人士参与了"世界木材日"的活动,大家一致认为:参加木文化活动能直接、有效地感受木材的好处,通过木材日的活动传递木文化的力量。木文化活动为人们认识木材打开了一扇新的大门。展开更多
源于1868年的沙夫豪森IWC万国表,在国际表坛上已有悠久的历史。2009年6月1日,尽管全球经济低迷,万国表依然在香港开设了全球首家旗舰专卖店,展示了独树一帜的"万国表精品生活"。一年过后,辉煌的业绩证明了决策者的先见之明。...源于1868年的沙夫豪森IWC万国表,在国际表坛上已有悠久的历史。2009年6月1日,尽管全球经济低迷,万国表依然在香港开设了全球首家旗舰专卖店,展示了独树一帜的"万国表精品生活"。一年过后,辉煌的业绩证明了决策者的先见之明。而策动这一切的旗手,正是IWC万国表的亚太区董事总经理颜钿洱(Etienne de Gramont)。在尖沙咀的香港1881 heritage,他向记者敞开了心扉。展开更多
文摘Genetic variation of ten Norway spruce (Picea abies (L.) Karst.) clones regarding their decay resistance against brown rot fungi, as well as physical and chemical properties of clones were investigated. 31- year-old spruce clones: 26, 31, A10, A15, A7, B10, B15, B6, V7, V9 were selected across Latvia. The stem diameters of spruce clones varied between 13.0 and 20.9 cm. The wood density of clones ranged from 361 to 443 kg/m3. Klason lignin content, depending on the clone, was between 27.0%-28.9%. Cellular UV microspectrophotometry of the non-infected tracheids displayed the typical lignin distribution with highest absorbance values in the cell corners (abs280 nm 0.80) and compound middle lamellae (abs280 nm 0.48), while secondary wall showed lower lignin absorbance values (abs280 nm0.29 - 0.35). The deposition of phenolic extractives in ray parenchyma and epithelial cells of resin canals were emphasized by a significantly higher UV-absorbance (abs280 nm 0.68 to 0.78) when compared to the cell wall associated lignin. The content of acetone-soluble extractives of spruce clones varied between 1.1% - 1.8%. The x-value (natural durability) for all spruce clones after exposure to C. puteana and P. placentawas >0.90 (durability class 5, not durable). Most of clones after degradation by G. trabeum had x-value > 0.90 with exception of clones B15 and V9 that showed x-value ≤ 0.90 (durability class 4, slightly durable). Natural durability of spruce clones did not correlate with stem diameter, density, content of lignin and extractives.
文摘木材是大自然馈赠给人类最美好而实用的生态材料,是可再生的天然资源。木材以其特有的属性为人类文明和生态环保作出了巨大贡献。"木材真好"("Wood is Good")应成为木材相关行业和活动的基础理念。鉴于木材显著的社会、文化、艺术属性,《国际木业》本年度设立"环球木文化"栏目,通过此栏目给读者更广阔的视角认识木材。"国际木文化学会"是最早用文化的方法去推广"木材真好"这个理念的一个全球非盈利性组织。"国际木文化学会"在2010年提出并倡议每年3月21日为"世界木材日"。"世界木材日"至今已连续举办了四届,上百个国家与木材相关的人士参与了"世界木材日"的活动,大家一致认为:参加木文化活动能直接、有效地感受木材的好处,通过木材日的活动传递木文化的力量。木文化活动为人们认识木材打开了一扇新的大门。
文摘源于1868年的沙夫豪森IWC万国表,在国际表坛上已有悠久的历史。2009年6月1日,尽管全球经济低迷,万国表依然在香港开设了全球首家旗舰专卖店,展示了独树一帜的"万国表精品生活"。一年过后,辉煌的业绩证明了决策者的先见之明。而策动这一切的旗手,正是IWC万国表的亚太区董事总经理颜钿洱(Etienne de Gramont)。在尖沙咀的香港1881 heritage,他向记者敞开了心扉。
