泡桐纤维变化及其制浆造纸研究

以8~11年生泡桐为研究对象,主要探究了泡桐枝材、根材的生物量分配比及木纤维变化规律,研究泡桐枝材、根材用于制浆造纸的可行性。结果表明:泡桐枝材、根材在整株生物量中所占分配比较高;泡桐枝材木纤维含量、纤维长度随枝龄的增加而呈现递增趋势,并逐渐接近于树干材;泡桐化学性质稳定,综纤维素含量高;用枝材、根材制得的纸浆理化性质符合国家标准,多数物理强度指标表现优异。泡桐废弃枝材、根材可作为造纸纤维原料进行资源化利用。     

兰考泡桐根材和枝桠材解剖特性和基本密度的研究

测定研究了不同直径兰考泡桐的根材和枝桠材的各种解剖因子及其基本密度，结果表明：兰考泡桐根材和枝桠材构造区别明显，不同直径的根材和枝桠材木材解剖性和基本密度均有变异，仅少数指标差异显著，根材和枝桠材相比，基本密度和木纤维含量为枝材＜根材，其余因匀为根材＞枝材。进一步分析论证表明，根材和枝桠材是刨花板的好原料；而枝材适宜于生产纤维板，但根材不合适。     

陕西兰考泡桐木材构造和材性的研究

对陕西渭南产兰考泡桐木材构造和材性的研究表明,木材材质优良,利用价值与其它泡桐相当,其管孔式类型并非为单纯的环孔材或单纯的半环孔材,而是环孔材至半环孔材。     

泡桐单芽接干试验研究

<正>泡桐属假二杈分枝,自然接干能力差,一般主干较低,往往形成二节材或三节材,严重影响泡桐材的经济价值,如何使低干变高干,培育出4m以上通直无节良材,增加外贸出口,提高经济效益,是泡桐生产中急待解决的重要课题.因此,我们于1987年在新乐县对泡桐单芽接干进行了试验,取得了明显的效果.     

中龄兰考泡桐胶合板材林营养补给效应的研究

中龄兰考泡桐胶合板材林营养补给效应的研究＊王保平李宗然李芳东周海江周道顺关键词兰考泡桐胶合板材林营养补给合理营养补给是泡桐胶合板材林定向培育集约栽培的一项重要措施，以前对幼龄泡桐进行营养补给的研究较多［１，２］，但缺乏对中龄泡桐林营养补给的研究，尤其...     

泡桐人工林效益分析

本文在试验的基础上，总结了红壤丘陵地区栽培泡桐纯林的经济效益状况。指出人工泡桐林一般７年生，每公顷可获去皮干材７５ｍ＾３，纯利润７５００余元，投入产出比为１：３２６。     

河南省泡桐木材利用现状及发展方向

本文对河南泡桐木材特性、利用途径所存在的优缺点进行了回顾和总结,并针对桐材的基本特性和河南省泡桐木材资源的优势,探讨了今后泡桐木材利用的发展方向,就如何解决桐材的大宗利用,克服桐木材质软、强度低的缺点和利用其性能稳定、材色佳、花纹好的优点谈了一些看法。     

真菌致泡桐材组分变化研究

用FTIR、ESCA等波谱分析方法，对真菌侵蚀的泡桐材进行了分析，结果表明：真菌侵蚀后，泡桐材的木质素含量相对比例增加、半纤维素含量降低、纤维素含量变化不明显。     

桐竹混交培育泡桐单板材的研究

利用生物种群共生的竞争作用，通过３种密度的桐竹混交试验，研究在复层混交条件下培育泡桐单板材的可能性。结果表明，桐竹混交在沿海地区有较强的抗风倒能力，能显著地提高泡桐的枝下高和主干高，使树干形数和圆满度显著增大，泡桐的单板材出材量提高５０％以上。     

白花泡桐材色优良单株的选择

正泡桐(Paulownia sp.)为良好的用材林树种,其材质轻软,易加工和干燥,尺寸稳定性好,很少开裂和变形,材质浅白,且有独特的丝绢光泽,但其缺点是生材锯解后,在存放、加工和使用过程中,其表面经常出现深褐色或黑褐色色斑,严重损害了成材和制品的外观质量,对其经济价值会造成很大影响[1-3]。因此,对其材色性状进行改善,对于提高桐材产品质量具有重要意义。     

泡桐木材防变色处理配方优选试验研究

为防止泡桐材的变色降等，采用防变色剂、耐光剂、渗透剂组成的防桐木变色剂配方处理桐木板材，观察其对色度ａ＊、ｂ＊、色差ＤＥ＊、明度Ｌ＊的影响。通过正交试验选择最佳工艺参数。处理后的泡桐板材可达到出口一级品之指标，颜色纯洁，保持木材天然本色。     

Seasonal variation of paulownia witches’-broom phytoplasma in paulownia trees and distribution of the disease in the Tohoku district of Japan

Seasonal variation of paulownia witches’-broom (PWB) phytoplasma within different organs (leaves, branch and trunk bark and roots) in paulownia trees was investigated by the amplification of a PWB-specific DNA fragment by the polymerase chain reaction (PCR). In leaf samples, PWB phytoplasma was first detected in June and the incidence gradually increased. On the other hand, the PWB was detected at relatively low incidence in branch bark, trunk bark and roots and the incidence did not change among seasons. A survey of PWB in 27 fields in the Tohoku district of Japan showed that malformed flower buds were observed in paulownia trees in almost all of the fields. PWB-phytoplasma was also detected by PCR from paulownia trees in almost all of the fields in Iwate and Fukushima Prefectures. The frequencies of trees in which phytoplasma was detected by PCR were higher than those in which symptoms were observed. These results indicated that PCR amplification of a PWB-specific DNA fragment is an effective tool for practical diagnose and that PWB is widely distributed in the Tohoku district of Japan.     

Study on Impacts of pH Value on Paulownia Wood Color

INTRODUCTIONPaulownia is one of important species with fastgrowth and high yield oriented to industry uses inChina, paulownia wood is widely used in furniture-making, decorating materials, musical instrumentsmanufacture (Jiang Jianping 1990), etc. Brown orblack stain often appears on the surface of paulowniawood during processing and using. Discolorationseriously affects paulownia utilization, and it cancause huge loss due to low grade and price causedby stain (Cheng Junqing 1983a, 1983b…     

茶园间种泡桐生态及经济效益的研究

前言茶树原产于我国云贵高原亚热带—热带湿润季风地区。在强光、高温、低湿条件下,茶树生长不良,茶叶品质下降。近二十多年来,世界主要产茶国家先后致力于改变茶园生态环境而提高茶叶品质的研究。我国早在唐代、宋代就有了茶粮间作、茶桐间作的记载。1959年云南普文农场在热带茶园成功地建立了橡胶与茶树间作的胶茶人工群落。1970—1985年唐荣南、王融初分别成功地建立了湿地松与茶树、葡萄与茶树的人工群落。本试验试图选用强阳性、深根落叶阔叶树——泡桐与茶树间作,建立多层次的复合生态系统,改善茶叶品质,促使茶叶稳产高产,同时提供部分优质木材,取得较高的经济效益。     

杂交泡桐色斑防治处理技术

由试验结果，提出了两种杂交泡桐木处理技术，一是适应脱除杂交泡桐木材表面已产生的经，褐色斑，二是适应防止杂我泡桐木材表面红，褐色斑的产生。通过对试验结果的分析表明：两种木材处理技术可有效的脱除，防止杂交泡桐木材表面产生的红，褐色斑，并具有很好的经济效益。     

Bow variation in kiln-dried boxed-heart square timber of sugi (<Emphasis Type="Italic">Cryptomeria japonica</Emphasis>) cultivars

To evaluate the bow variation in boxed-heart square timber of sugi (Cryptomeria japonica), bows from kiln-dried timber for five sugi cultivars with different longitudinal shrinkage trends were compared for two stem heights. Two general trends were observed, depending on the cultivar: (1) either the bow was larger at the lower than at the upper part of the stem, or (2) the bows at the lower and the upper parts of the stem were similar. In timber that had larger bow values, the gradients of longitudinal shrinkage were large across the radius and along the length of the timber. There was a positive relationship between the bow and longitudinal shrinkage. These results suggest that the bow variation between the timbers was caused by a variation in longitudinal shrinkage, which was affected by the microfibril angle. Furthermore, the bow was inversely proportional to the modulus of elasticity, which suggests that timber with a low modulus of elasticity is susceptible to a large bow due to large longitudinal shrinkage.     

中国泡桐属木材科学研究现状及展望

泡桐(Pauitio:t)是我国的一类优良的速生优质用材树种,也是平原绿化、营建农田防护林、四旁植树和林粮间作的重要树种。     

Effects of Light Intensity and Regeneration Mode on Stem Form and Growth of Cunninghamia lanceolata Saplings

ABSTRACT

Regeneration plays an essential role in the restructuring of plant communities, with seedlings and sprouts representing two different regeneration strategies. As an important timber species, Cunninghamia lanceolata is widely distributed throughout southern and eastern China. However, the morphology and growth of its sprouts and seedlings under natural environments have not been examined in detail. Our study quantified the morphology and growth of Cunninghamia lanceolata during its early regeneration phase. We selected a secondary mixed coniferous forest in the Huangshan region of China as the research location, and examined sapling height, basal stem diameter, lateral branch length, as well as the relationships between main stem and lateral branch elongation, and between sapling basal stem diameter and height. The results showed that high light intensity promoted the extension growth of main stems and the elongation of lateral branches of seedlings. Meanwhile, sprouts generally had shorter height growth than seedlings with the same basal stem diameter, and the growth allocation of seedlings was generally more dependent on light intensity. Our findings suggest that the morphology and growth of C. lanceolata might vary depending on the interaction of regeneration mode (plants originating from sprouts or seedlings) and light intensity.     

大叶榉树无性系生长性状的早期变异

该文报道了大叶榉树无性系2年生幼林生长测定结果。研究表明,不同无性系树高、胸径、枝下高、冠幅、干形、分枝数、分枝粗、分枝角度等8个性状均有显著差异(P0.05),不同性状的遗传变异系数在4.7%~26.6%之间,性状重复力在0.49~0.89之间。胸径与树高、枝下高之间,冠幅与分枝角度、干形(弯曲度)之间存在显著正相关,树高与分枝粗度之间存在显著的负相关。主成分分析结果显示,无性系性状前4个主成分的贡献率达85.21%,利用主成分得分值进行聚类分析,可将24个无性系划分为4类。以用材为育种目标,初选出"红4"、"桔3"和"黄10"等3个优良无性系。