谈评等中针叶材活节检量

本文针对GB／T114－1995《原木检验》标准中，有关针叶树材的活节，检量颜色较深，质地较硬部分（似黑眼珠）的尺寸问题，认为颜色较深、质地较硬是构造特征，节子尺寸应含最外圈年轮。检量似黑眼珠不符合国际惯例。     

浅谈锯材干燥产生干裂问题

本文阐述了锯材在干燥过程中出现的干裂问题及产生的原因和防止办法。     

Load behaviors of a prefabricated wood framing house during lifting and transportation

Lifting for handling and flatbed truck transportation to the job site are important processes during manufacture of prefabri-cated wooden construction units like mini homes and building modules. Significant damage can occur to sections or components of units during these operations. Although damage usually will not impair its structural safety, it is costly to fix and causes the public to perceive prefabricated wooden buildings as low quality products. Field observations and preliminary numerical models for prefabri-cated units subject to lifting and transportation forces are summarized here. Once fully developed and verified, models will support the creation of damage mitigation strategies centered on structural details indicating how units are to be supported during lifting and transportation.     

有效微生物群对生活污水中有机物的降解能力研究

采用正交试验方法．研究了有效微生物群（简称EM）对生活污水中有机物的降解能力．结果表明：EM能去除生活污水中的有机物，且在水温为25℃,水力停留时间（HRT）为48h，台液加入量（VEM／V污水）为1／104，曝气时间为HRT／3，进水PH值为8．0时处理效果最佳．在此最佳处理条件下，测定了污水中BOD5，CODcr随时问的变化情况，并与不加EM的测定结果进行了比较，加EM的污水中有机物去除率大大增加，2d后接近最高值并趋于稳定．EM在处理生活污水方面的优势是：较少或不产生污泥，曝气时间短，但如果要较好地应用于生活污水治理，必须提高污水中的EM浓度．     

粤北低山丘陵地区小红栲木材物理力学性质初步研究

对粤北山区速生树种小红栲木材的物理力学性质进行了测试，并据此分析了该木材的加工利用价值，提出了开发利用的途径     

杉木建筑材林密度管理技术与生长效应的研究

根据杉木人工林现有林调查材料、固定样地材料及密度管理试验林材料，分析了不同立地类型、不同密度的杉木林分生长效应，在建立数学模型的基础上，提出了杉木建筑材林合理密度管理技术。     

Leaf-water potential and soil-water depletion of walnut mulched with polyethylene and intercropped with alfalfa in Central Italy

In Italy, new agroforestry cultural models could play an important role in the diffusion of plantation forestry timber species. We studied the stem growth rates and leaf water potentials () of common walnut (Juglans regia L.), and gravimetric soil moisture (_DW) depletion during the third and fourth growing seasons in an agroforestry trial in central Italy. Since the establishment of experimental plots in 1992, walnut was intercropped with alfalfa (Medicago sativa L.), with or without polyethylene (PE) mulching along tree rows. By the end of the study period, the unmulched-intercropped walnut was almost 68% smaller in stem diameter and height than the sole-unmulched control, demonstrating walnuts sensitivity to alfalfa competition. The competitive effect of alfalfa on walnut stem growth was effectively controlled/reduced by PE mulching. Stem growth rates of mulched-intercropped walnut were always lower than the control, but much higher (ca. 235% in stem diameter and height) than those of unmulched-intercropped walnut. The higher field performance of mulched-intercropped walnut compared to the un- mulched-intercropped treatment was associated with higher soil moisture and predawn and midday values during the summers driest periods. The presence of PE mulching was also associated with lower levels of soil moisture during the early and late growing season, but this did not negatively affect walnut and growth rates. These results suggest that in the climatic conditions of central Italy, competition for soil moisture between young common walnut trees and alfalfa can be substantially lowered, but not completely eliminated, by PE mulching.This revised version was published online in November 2005 with corrections to the Cover Date.     

中国木材产业资源基础及可持续性分析

论述了发展中国木材产业的战略重要性;通过分析国内木材资源与国际木材资源供给,得出了中国木材产业资源基础薄弱的结论;以实现资源基础可持续性为目的,论述了构筑中国木材产业资源基础的途径。     

不同类型长白落叶松人工林各龄期的木材产量评估

根据立地指数的不同将长白落叶松林地分为7个立地等级(立地Ⅰ~Ⅶ),结合其营林技术规程选择造林密度为2 500株/hm2、3 300株/hm2和4 400株/hm2等不同类型的长白落叶松人工林分作为评估对象。在前人研究的基础上计算该不同类型林分在各林龄阶段的平均树高,利用相关模型推算相应林龄阶段的林分平均胸径和林分平均单株材积。建立长白落叶松人工林分的密度定量管理模型,根据此模型确定不同立地等级不同初植密度长白落叶松人工林分在理想状态下的间伐时间、间伐强度和木材收获量,为其营林生产和科研提供参考。     

片石砂上发展用材林、经济林效益调查分析

片石破土上发展用材林、经济林，在适地适树、集约经营的条件下，湿地松、杉木用材林每公顷年均产值在３０００元以上，柑桔、板栗等经济林木在７５００元以上；在同一立地条件上，用材树种的生长效益排列顺序是：国外松、木荷、马尾松，杉木只能在土层深厚的山坞、山脚小面积造林，经济林必需实行高标准、高投入，才能取得好效益，树种以柑桔、板栗、枇杷、桃形李等为主。