次生幼龄林封山育林后乔木层物种结构变化研究

1999年在浙江省仙居县俞坑村的封山育林区设置20 m×20 m的固定样地2块,对连续5年的调查数据进行统计分析,以其对次生幼林乔木物种结构变化进行研究.分析结果,乔木层物种丰富度指数增加了7～11,乔木物种增加了2～5科,3～8属.自然恢复为以壳斗科、杉科、山茶科、樟科、胡桃科、安息香科等物种为建群种或共建种的次生常绿阔叶林、针阔混交林.     

云南小黑山省级自然保护区综合评价

云南小黑山省级自然保护区具有典型性、稀有性、多样性、脆弱性、自然性、完整性等自然属性特点；就保护区的生态、社会、经济效益对保护区的保护属性进行了评价；分析保护区的管理现状和存在的主要问题。综合评价结果，保护区的建设是一项生态效益巨大、社会效益显著的生态工程，对连接南北动、植物区系起着重要作用，在科研上具有重要价值。     

湖南借母溪自然保护区两栖动物区系研究

报道了借母溪自然保护区两栖动物资源和区系特征的调查结果。已知有2目8科25种。广布种5种，古北界种1种，东洋界19种。进而进行区系分析和多样性分析。     

维西莲瓣兰资源保护与开发对策

莲瓣兰是目前维西人民从森林中获取的主要经济物质之一，是重要的林下资源，栽培比较普遍，对增加当地人民收入起到了巨大作用。通过调查分析维西县莲瓣兰资源现状、兰产业发展现状及其存在的问题，提出了保护野生、家养兰花资源，进行兰花产业开发的对策措施。     

Selection, propagation and cultivation of Pinus massoniana clones for pulp use

Based on the growth, wood property of the ortets, and rooting abilities of cuttings, 32 Pinus massoniana clones for pulp use were selected from forests of superior provenance, mixed families, and progeny test of seed orchard by two-step selection. The average height and DBH growth of three-year-old clones were 28.6% and 16.7%, respectively, higher than those from seedlings, and average gain of wood density reached 8.7%. Rooting rate of all these clones was over 80%, 28% higher than the clones selected by a single step. A cutting orchard of 0.33 hm² on the hillside was constructed to intensively produce cuttings according to the tests on construction methods, pruning, and fertilization. A total of 50,000 grade I, 37,500 grade II, and 62,500 grade III cuttings were collected per hectare of this cutting orchard each time, and were cut three times each year. With all the above techniques, 48 hm² of clonal forests for pulp use of those clones had been planted in five places in Fujian Province. Container stecklings are more likely to increase the planting survival rate. __________ Translated from Scientia Silvae Sinicae, 2004, 40(1): 64–69 [译自: 林业科学]     

European forest accounting: general concepts and Austrian experiences

Within the European Union there exist three different frameworks for forest accounting at the national level. For purposes of the national accounts, the regulations of the European System of Integrated Economic Accounts (ESA) have to be observed. They require a distinction between forestry and logging and provide specific guidelines for the valuation of standing timber. In recognition of the special character of forests and forestry production, two satellite accounts are devoted to forestry: the Economic Accounts for Forestry (EAF) and the European Framework for Integrated Environmental and Economic Accounting for Forests (IEEAF). Although they were designed as complementary to the national accounts and refer to the same basic methodologies, the guidelines for forest accounting provided by the three manuals are not fully compatible. Just recently, a further integration and harmonization of the concepts for forest accounting has been proposed. Austria has implemented the valuation of the increment as an output of forestry as requested by ESA and produces the EAF tables on a regular basis. The possibilities for extending forest accounting to natural resource accounts for standing timber and the IEEAF have been investigated in terms of pilot studies. The Austrian experiences and results exemplify the problems and possible solutions associated with the adoption of the different European schemes. Data deficits and valuation issues restrict the significance of respective results to some degree, especially as regards forestry-specific extensions of the accounting schemes.     

我国木工机械的现状与发展探讨

通过对木工机械行业的现状以及面临机遇与挑战的分析，尤其是对我国木工机械行业在设计和制造方面存在的问题进行探讨和分析后，对我国木工机械行业发展提出了几点建议。     

杨木胶合板模板工艺研究

采用正交试验方法对杨木胶合板模板生产工艺进行研究，探讨了表面处理方法、涂胶量、热压压力、热压时间等工艺参数对产品性能的影响，提出了较佳的工艺参数。试制结果表明，采用文中提供的工艺参数，可制得符合要求的胶合板模板。     

龙湖森林公园景观资源与景区规划构想

详细介绍构成龙湖省级森林公园景观资源的五大类型:生物、水域、天象、地文和人文景观资源.依据公园的性质、规划原则进行总体布局,并分别对规划的观光游览、休闲度假、激情游乐、悠游探秘四大景区的特点和园林绿化规划内容进行阐述.提出在保护自然环境的前提下,实行利用与保护兼顾,突出特色,将其规划建设成为一个兼有避暑、度假、休闲、娱乐、科普教育于一体的生态型多功能省级森林公园.     

Difference in cutting age for highest profit by methods for calculating CO<Subscript>2</Subscript> emission trading and the price of CO<Subscript>2</Subscript>

 The amounts of CO₂ that are absorbed and emitted by forest in a model stand area were determined using two calculation methods, namely the flow approach and the stock approach for emission trading, to understand the relationships between the cutting age for the highest profit rate (CAHPR; optimum tree ages to be cut so as to maximize the profit) and (1) the prices of CO₂ and (2) the balance between CO₂ emission and absorption. The resultant CAHPR differed between these two CO₂ accounting methods, which give different tree ages for maximum log volume yield. A rise in CO₂ price caused the CAHPR to approach the tree age of maximum log volume in the flow approach method, and to deviate from the tree age of maximum log volume in the stock approach method. Even at the same CO₂ price, the CAHPR differed between the CO₂ accounting methods. At low CO₂ prices, the CAHPR did not affect situations where the difference of average profit is large by cutting age. On the other hand, the CAHPR was greatly affected at low CO₂ prices when the mean log volume growth changed with tree age. These trends were found to be universal. Received: September 18, 2001 / Accepted: October 25, 2002 Acknowledgments This study is one of the fifth science study subsidy projects of the Japan Forest Technology Association. Correspondence to:K. Sakata