In vitro plantlet formation from embryonic explants of eastern white cedar (Thuja occidentalis L.)     

Harry IS  Thompson MR  Lu CY  Thorpe TA 《Tree physiology》1987,3(3):273-283

A protocol is described for the in vitro production of plantlets from embryonic explants of eastern white cedar (Thuja occidentalis L.). Bud induction was optimal when embryonic explants were cultured for 20-25 days on half-strength Quoirin and Le Poivre mineral salts containing equimolar concentrations (10(-6) M) of N(6)-benzyladenine and 2-isopentyl adenine. Bud development was achieved in phytohormone-free medium in the presence of activated charcoal. Maximal shoot elongation occurred on half-strength Quoirin and Le Poivre salts, whereas shoot multiplication was optimal on half-strength Bornman's MCM salts in the presence of cytokinin. Hardened shoots, dipped in commercial rooting powder containing indole-3-butyric acid, rooted optimally in mist under non-sterile greenhouse conditions. Both rooting and subsequent plantlet growth was best when Redi-Earth((R)) was used as a substrate. Over 250 plantlets per embryo can be produced annually by this technique.  相似文献   

Carbon return and dynamics of litterfall in natural forest and monoculture plantation of Castanopsis kawakamii in subtropical China     

Guo Jianfen  Xie Jinsheng  Lu Haoliang  Liu Dongxia  Yang Yusheng  Chen Guangshui 《中国林学(英文版)》2004,6(1):33-36

The amount of carbon returned through litterfall and its seasonal pattern were studied in a natural forest of Castanopsis kawakamii (NF) and adjacent monoculture plantations of C. kawakamii (CK) and Chinese fir (Cunninghamia lanceolata) (CF) in Sanming, Fujian Province, China. Mean annual carbon return through total litterfall over 3 years (from 1999 to 2001) was 5.097 t·hm⁻² in the NF, 4.337 t·hm⁻² in the CK and 2.502 t·hm⁻² in the CF respectively. Of the total carbon return in the three forests, leaf contribution accounted for 58.96%, 68.53% and 56.12% and twig 24.41%, 22.34% and 26.18%, respectively. The seasonal patterns of carbon return from total litterfall and leaf-litter were quite similar among the three forests. A peak of carbon input from litterfall in the NF and the CK occurred in spring except for the highest annual C return through branch litter of the NF in summer, while the CF showed the maximum C return in summer. The results of this study demonstrate that the natural forest has a greater C return through litterfall than monoculture plantations, which is beneficial to the increase of soil organic matter storage and the maintenance of soil fertility. [Supported by the Teaching and Research Award Program of MOE P.R.C. (TRAPOYT) and the Key Basic Research Project of Fujian Province (2000F004)]  相似文献   

泡桐木材仿红木染色工艺的研究   总被引：6，自引：0，他引：6  

陈玉和  陆仁书  杨洪义 《林产工业》2001,28(4):17-19

对家具贴面用单板进行染色试验，通过正交方法就木材染色主要因素ＮａＣｌ、乙酸、染料浓度等和它们之间的交互作用对染色单板色差的影响进行了系统地研究。泡桐单板仿红木色最佳染色工艺参数是ＮａＣｌ浓度１．５％、染料浓度０．５％、乙酸浓度２％、渗透剂浓度０．１％、染色温度９０℃和染色时间４ｈ。  相似文献   

Influence of Ammoniacal Copper Quaternary treatments on mechanical properties of blue-stained Lodgepole Pine wood   总被引：1，自引：0，他引：1  

江京辉任海青  吕建雄骆秀琴　吴玉章 《林业研究》2007,18(3):213-216

Three concentrations （2.8%, 2.0%, 1.2%） of Ammoniacal Copper Quaternary （ACQ） was selected to treat Lodgepole pine wood for evaluating ACQ treatment on mechanical properties of blue-stained wood. The bending modules of elasticity （MOE）, modules of rupture （MOR）, toughness and shearing strength parallel to grain on tangential surface, are tested according to the criteria GB1927-1943-91. Non-treated sample were also tested according to the same procedure. The results showed that the three groups specimen impregnated by different concentrations of ACQ solution met the AWPA standard 2003 of America （UC4A 6.4g/cm^3）. There were significant difference of toughness between treated wood and non-treated wood （p=0.01）, but there were no statistically significant differences among three concentrations in terms of toughness, and toughness of treated wood was approximately 20% lower than non-treated. MOR, MOE as well as sheafing strength parallel to grain were found to be not significantly different between treated wood and non-treated one, and there were no statistically significant difference among three concentrations of ACQ too. Toughness, MOR, MOE and sheafing strength parallel to grain increased with decrease of concentration of ACQ, but they were hardly affected by ACQ preservatives.  相似文献   

ＦＲ—１、ＦＲ—２及ＰＦ树脂对木材阻燃、防腐、尺寸稳定等效果的研究   总被引：2，自引：0，他引：2  

蒋明亮  刘秀英  吕慧梅 《林业科学》2001,37(1):121-125

功能性改良药剂ＦＲ－１、ＦＲ－２及ＰＦ树脂处理马尾松、毛白杨后对木材阻燃、防腐、尺寸稳定及ＭＯＥ／ＭＯＲ的研究结果表明，ＦＲ－１处理的马尾松吸药量为３４．５kg/m^3时，氧指数可达６１％。ＦＲ－１处理的马尾松、毛白杨达到阻燃标准时，其用药理根据板材的厚度进行了初步确定，剂量范围为３０－９０kg/m^3。ＦＲ－１及ＦＲ－２在达到阻燃用药量的同时，处理后的马尾松、毛白杨耐腐试验的重量损失率小于或按拉１０％。ＦＲ－１处理的马尾松、毛白杨、吸药量分别为７５．６及９３．５kg/m^3时，吸水至饱和时，木材抗湿胀率（antiswelling ef-ficacy,ASE)分别为３０％、４６％；ＰＦ树脂处理的马尾松、毛白杨 、吸药量分别为７９．０％、６３．８kg/m^3时，ＡＳＥ分别为４６．２％、４１．４％。各处理对抗弯弹性模具（ＭＯＥ）影响为，ＦＲ－１处理的马尾松，ＭＯＥ差异不明显，ＦＲ－１处理的毛白杨，ＭＯＥ增加幅度为６．１％，ＰＦ树脂处理的马尾松，毛白杨、ＭＯＥ增加幅度分别为１０．６％及１７．９％。ＦＲ－１处理的马尾松、毛白杨对抗弯强度（ＭＯＲ）影响不明显。  相似文献   

净化生活污水的浮床植物筛选     

彭蕾  汤春芳  陈永华  陈明利  杜露  柳俊 《中南林业科技大学学报(自然科学版)》2020,(5):162-170

【目的】筛选出目前对生活污水净化效果较好的浮床植物。【方法】以14种湖南常见的草本和木本植物为材料,监测了污水处理过程中植物的株高、根系结构和生物量等生长指标,CODcr、TN、NH3-N、TP等水质指标的动态变化,并进行了植物的生长指标与水质净化指标的相关性分析。【结果】1)大部分植物均有较强的生长能力,其中水葱、水蕹菜的株高具有显著性优势(P <0.05);美人蕉、再力花、菖蒲和梭鱼草均表现出极强的生根能力,其根长增长率分别为390%、293.33%、286.67%和270%;植物的生物量增长率在5.1%~500.7%之间,其中菖蒲、美人蕉、水蕹菜和再力花的生物量具有显著性优势(P <0.05)。2)无植物对照组对污染物的去除率明显低于有植物处理组,处理时间的长短对污染物的净化效果具有显著差异性(P <0.05),且主要表现为早期对污染物净化速率快。所有植物处理对CODcr、TN、NH3-N、TP的平均净化率比无植物对照组分别提高了6.30%~36.80%、11.92%~20.97%、22.92%~29.28%、5.51%~41.24%,其中,美人蕉对CODcr的净净化率高达36.80%,水蕹菜对TN、TP的净化效果表现出显著性优势(P <0.05),梭鱼草则对NH3-N具有较好的净化能力。3)根据筛选指标的平均隶属函数值对14种草本和木本植物进行聚类分析,可将植物分为高、中、低净化能力植物三大类,高净化能力植物:梭鱼草、菖蒲、美人蕉、鸢尾、水蕹菜和再力花。中等净化能力植物:花菖蒲、旱伞草、黄菖蒲、花叶芦竹和水葱。低净化能力植物:冬青、女贞和月季。【结论】草本植物中的梭鱼草、菖蒲、美人蕉、鸢尾、水蕹菜和再力花以及木本植物中的冬青对生活污水具有较高的净化能力,适合用作生活污水处理的浮床植物。  相似文献   

国内竹制旅游商品的生产现状与市场前景分析     

郑进烜  董文渊  赵敏燕  李蓓  郑艳  卢珍红 《竹子研究汇刊》2006,25(3):55-58

中国竹林生态旅游业的迅速发展推动了竹制旅游商品生产及市场的蓬勃发展。通过对国内竹制旅游商品生产企业数量及竹制旅游商品的类型、品种的调查统计,针对竹制旅游商品市场存在的问题,对竹制旅游商品的市场前景及发展趋势进行了综合的分析及预测。  相似文献   

STEAMING-HIGH TEMPERATURE DRYING OF LARCH LUMBER     

Lu WendaNortheast Forestry University 《林业研究》1991,2(1):79-82

A series of drying tests on Larch Lumber and a theoretical analysis led to the follow-ing conclusions:1.Steaming pretreatment is a very powerful means to decrease defects induced by the drying processand increases the drying velocity of the lumber.2.The steaming—high一temperature drying schedule had resulted in fast drying and good quality ofthe dried lumber.  相似文献   

树脂酸甲氧基甲基三聚氰胺衍生物合成的研究     

吕宏斌  王定选 《林产化学与工业》1994,14(3):9-14

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核磁共振技术在竹木材研究中的应用     

陆方  程海涛  王戈  郭雪峰 《竹子研究汇刊》2007,26(1):37-41

核磁共振技术在竹木研究相关领域起到了重要的作用,以其它方法无法比拟的优势越来越多的应用于竹木材研究之中。文章在阅读文献的基础上,结合实验数据,阐述了核磁共振技术在研究竹木材高分子组成、抽提物以及胶粘剂化学结构方面的应用。  相似文献