东巴凤基础设施大会战后话沼气

沼气池建设作为河池市大会战主要项目建设之一,其项目在整个大会战中占80％,项目涉及千家万户,工程任务最为艰巨与复杂,经过艰苦努力,6万座沼气池建设已全面完成任务．三县沼气池入户率一举跨入全区先进县行列……     

滁州实施林油一体化项目

日前,国家林业局、中石油林油一体化项目落户滁州市,全市25个国有林场承担了项目5万亩黄连木油料能源林基地一期工程新建和改造任务,     

云南省林业厅实施效能政府四项制度成效显著

行政绩效管理制度。制定了具体的绩效管理实施方案并组织实施,重点加强督促检查和指导2010年农村能源建设顺利完成项目绩效评价所要求的各阶段工作任务。按照各项重点工程的项目管理办法对木本油料产业建设项目、营造林项目、天然林保护     

全面实行预决算管理 提升天保资金绩效

正新疆在实施天然林资源保护工程二期过程中,积极推行项目资金预决算管理,实施资金计划、项目设计、工程实施、验收决算全过程绩效管理。在提高资金使用效率、确保资金安全、发挥工程项目效益等方面取得积极成果。1全面实行项目资金预算制始终坚持推行天保工程资金预决算制,通过编制天保工程年度实施方案,落实国家天然林保护政策、天保工程专项资金管理办法、自治区有关人事、财务制度和规定,按项目建设依据、标准、程序和资金控制数,结合天然林保护任务与生态建设实际需求,确定     

如何做好园林绿化工程的施工项目管理——中关村西区楔形绿地景观工程项目管理简介

本文介绍了建设工程项目管理的内涵及施工项目管理的目标和任务并从施工安全管理，施工成本控制，施工质量控制，施工合同管理，施工信息管理及与施工有关的组织和协调七个方面，结合中关村西区楔形绿地景观工程的施工项目管理，以安全的形式详尽地介绍了如何才能做好园林绿化工程的施工项目管理，对园林绿化工程及景观工程施工企业具有较高的参考价值。     

实施林业外资项目的启示

丰都县自1995年以来，已先后组织实施了世界银行贷款中国森林资源发展和保护项目多功能防护林工程建设和中德合作重庆造林项目。世界银行贷款“中国森林资源发展和保护项目”丰都县多功能防护林示范工程完成工程建设合格面积8552．15公顷，占总体设计规模8400公顷的101．8％；中德合作造林项目到2004年春，已完成项目建设任务6964．3公顷。占总计划任务6963．7公顷的100％。我们通过参加项目的实施，得到了一些体会与启发：     

以科技促“长防”建设

汉中地区长防办1994年承担了科技兴林“281”工程中《规范化造林》和《封山育林》两个项目在5个长防县的技术推广任务,并组织了实施。两个项目的推广取得了显著成绩,促进了长防林工程建设任务的顺利完成,促进了1994年的灭荒。 1.规模大,速度快。5个长防县承担规范化造林技术推广任务8.2万亩,占全区推广任务12万亩的68.3％,实际完成11.5万亩,超任务40.2％,占全     

国道321线资阳市城区段水泥砼路面施工方案简介

１９９８年１０月我院承担了国道３２１线资阳市城区段道路改建工程的施工监理任务。本人有幸参加了该项目工程的路基及     

海东市三北五期工程建设成效分析

海东市三北防护林工程建设从1978年开始实施,经历5个工程建设期。在建设中,海东市按照项目管理要求,合理安排,落实责任,先后完成三北防护林工程造林任务,特别是五期工程以来,海东市造林成效显著。为了推进该项工程科学发展,就海东市三北五期工程建设成效进行分析。     

统筹网络及其优化技术

“时间就是金钱,效率就是生命。”这是现代化管理的口号。作为现代化管理的重要组成部分的统筹网络计划技术,是通过网络图来表示计划任务(工程、项目)的进度安排及计划任务的各项作业(或各道工序)之间的关系;通过分析,能帮助我们找到缩短工期和合理利用资源的优化方案。它在工程计划方面得到广泛的应用。工程的含义甚     

Repair and strengthening of timber cantilever beams

This research aims to study the feasibility of repair and strengthening of timber cantilever beams used in historic buildings. It is conducted to investigate the feasibility of using different valid materials and techniques to repair and strengthen timber cantilever beams in new and historic timber buildings. The study is performed in terms of structural performance as well as historic and architectural values. An experimental program of several different materials and techniques is executed. The results are driven in terms of initial cracking load, crack propagation for the tested samples at different loading stages, deflection values, and failure load for each repaired or strengthened material and technique. The main variables are timber types (new and historic), repair and strengthening materials (steel plates, Glass Fiber Reinforced Polymer wrap, and Carbon Fiber Reinforced Polymer laminates), repair or strengthening techniques (near surface mounted and externally bonded system), and cantilever length (1000 and 1250?mm). Test results indicated that using steel plates, glass fiber wrap, and carbon fiber laminates increases the value of failure loads and decreases the deflection at both; repaired and strengthened timber cantilever beams compared to control beams.     

竹大片刨花板对竹材生物学特性的适应性

以云南四种典型材用丛生竹（龙竹、甜龙竹、黄竹和油勒竹）宏观构造、组织结构、主要物理力学性质和化学组份等竹材主要生物学特性的研究分析结果为依据,提出了竹大片刨花板的结构、制板工艺和设备与原料竹材生物学特性之间应有的适应性关系。继而,通过实验室系列化试验和工厂试生产,确定了竹大片刨花板的应有性能和最佳工艺条件包括竹大片刨花的最佳质量指标及其最佳制备条件。     

Comparative Study in Chemical Character and Fatty acid Compositions of Masked Civet''''s Fat and Nutria''''s Oil

IntroductionMaskedciVet(Paguma18vata),Mammalia,Viverridae,ismainlydiStributedinShanxi,Sichuan,Tibet,Yunnanprovinces,etc..Itsmeatisdeliciousandhasspecialflavor.Itiseasytoberaisedartificially,withhighproduCtivity.Nutria(MyocasterCOypus),Rodentia,Capromyidae,originatedinArgentina,Chili,etc.insouthAmerica.Itisakindofherbivoresfur-bearer.itsartificialraisinghassuchmeritsasdurablefurandlowcostandhighproduCtivity.MaskedcivetandnutriahavehigheconomicvalueandwideprospeCtofutilization.Atpresen…     

自然保护区合作管理(共管)理论研究综述

自然保护区合作管理自20世纪80年代末期开始逐步兴起,在资源管理中被广泛使用。文章介绍了共管的含义、共管实施原则、分析框架和评价指标。从公共部门和私有部门的互动模式、集体行动类型的不同、政府和资源使用者的参与管理方式三个方面论述了共管的模式。分析了政府和社区在共管实施过程中的作用,指出共管仍面临着分权不够、合作中的文化障碍、组织类型简单和信息交流不充分、社区参与能力和认识能力不足等挑战。     

Chemical composition of wood and its connection with wood anatomy in Betula pubescens

ABSTRACT

The connection between chemical composition and anatomy of wood is poorly studied. Abiotic and biotic growth conditions affect the synthesis of structural compounds and the anatomy of wood at the same time as they affect growth. In this study, the wood chemical composition, and connections between wood chemistry and anatomy were studied in downy birch (Betula pubescens Ehrh.) grown on four growth sites possessing mineral and peat soils. Lignin, holocellulose, extractive and ash contents, and effective heating value were analysed and compared with libriform fibre double wall thickness and lumen diameter, vessel size and number, and ray and axial parenchyma numbers. Measured lignin and extractive contents were exceptionally high and holocellulose content low. Correlations between wood anatomy and effective heating value were partly different on different soils. Correlations between holocellulose and anatomy were the opposite of the correlations between other chemical compounds and anatomy. The significant correlations between chemical composition and anatomy were commonly opposite in trees grown on peat than in trees grown on mineral soil. Particularly, vessel characteristics and fibre wall thickness correlated significantly with wood chemistry in trees grown on mineral soil. The connections between wood anatomy and chemistry proved to be soil-dependent.     

用苯芴酮萃取分光法测定微量锗

本文探讨了用苯芴酮萃取分光法测定微量锗的实验条件和步骤．结果表明，用此法测定微量锗灵敏度高、操作简便、准确，是测定微量锗的较好方法．可用于对植物和食品中的微量锗进行检测．     

Spatial patterns of Douglas-fir and aspen forest expansion

Spatial patterns, rates, and density of encroaching forests into adjacent grasslands have important implications for long-term land use management and resource planning. This study examines the effects of Douglas-fir (Pseudotsuga menzeisii) and aspen (Populus tremuloides) regeneration mechanisms on sucker and seedling spatial patterns, distance from adult trees, and density in encroaching forests. A total of 8,924 aspen suckers and 1,244 Douglas-fir seedlings were counted and mapped in 2,920 quadrats (5 m × 5 m) in 106 plots along a lower forest-grassland ecotone in the Centennial Valley, MT, USA. Sucker and seedling spatial patterns were analyzed using Morisita’s I index. Average sucker and seedling density per quadrat and distance from adult trees were estimated for each plot and compared between aspen-dominated plots and Douglas-fir-dominated plots using ANOVA tests. Aspen suckers were established in a clustered spatial pattern at a significantly higher density and a significantly shorter distance from the adult trees. In contrast, Douglas-fir seedlings were established in varying spatial patterns at a significantly lower density and a significantly greater distance from the adult trees. Forest encroachment into the adjacent grassland in the Centennial Valley is occurring in contrasting patterns and at varying rates and densities due to the difference in aspen and Douglas-fir regeneration mechanisms.     

气候因子对竹子生长的影响研究综述

竹子是集经济、生态和社会效益于一体的优良林种,是区域农村经济社会发展的重要资源和生态环境保护的重要屏障.温度、水分、光照、大气组分等的变化直接影响着竹子的生长发育和分布.该文从主要气候因子对竹子生物学特性、生态学特征及其分布和经济产出的影响研究现状进行了综述,提出了今后需要重点开展的相关研究内容.     

Modelling impacts of changes in carbon dioxide concentration,climate and nitrogen deposition on carbon sequestration by European forests and forest soils

Changes in the Earth's atmosphere are expected to influence the growth, and therefore, carbon accumulation of European forests. We identify three major changes: (1) a rise in carbon dioxide concentration, (2) climate change, resulting in higher temperatures and changes in precipitation and (3) a decrease in nitrogen deposition. We adjusted and applied the hydrological model Watbal, the soil model SMART2 and the vegetation model SUMO2 to asses the effect of expected changes in the period 1990 up to 2070 on the carbon accumulation in trees and soils of 166 European forest plots. The models were parameterized using measured soil and vegetation parameters and site-specific changes in temperature, precipitation and nitrogen deposition. The carbon dioxide concentration was assumed to rise uniformly across Europe. The results were compared to a reference scenario consisting of a constant CO₂ concentration and deposition scenario. The temperature and precipitation scenario was a repetition of the period between 1960 and 1990. All scenarios were compared to the reference scenario for biomass growth and carbon sequestration for both the soil and the trees.     

我国湿地保护管理现状与优化对策

我国湿地资源在全球占据重要地位, 在我国生物多样性保护与社会经济可持续发展方面发挥着重要作用。在总结我国湿地保护管理现状的基础上, 文中指出我国湿地保护管理方面存在着责权不清、管理机构不健全且有重叠、将湿地划为未利用地以及制度与机制有待完善等问题, 提出了优化我国湿地保护管理体制的建议, 以期为湿地相关立法提供依据, 并进一步促进我国湿地保护管理水平的整体提升。