聆听蝉鸣

阳光洒下，树影斑驳，浓密的枝叶间，蝉安安稳稳地栖息着，开始了生命的歌唱。蝉在歌唱什么呢？寂静的夏日午后，暑热蒸腾，一切都安静了。时光悠长的影子缓缓游移，人们都睡了，鸟也歇了，风也远了。只有蝉，还在鸣唱。你听，“知了一一知了”，无数蝉声汇集，大合唱一般。夏天，便有了声响。     

指纹背后的真相（小说）

深夜11时，一个黑影拎着塑料壶悄悄地来到了内蒙古自治区牙克石市绰源镇孙明家门口，他将一张粘有胶带的纸条粘在孙家车库大门上，然后爬上孙家仓房，把塑料壶内的汽油倒在了仓房上，用随身携带的打火机点燃了汽油，火苗一下子蹿了起来。他跳下来，后退几步，看着仓房上的火苗，又看看大门上的纸条，露出了笑容，转身走了。他走后约5分钟，孙明家邻居老李出来上厕所，发现着火了，他一边喊人救火，一边拨通了绰源森林公安局的电话。     

林权改革 渐行渐深

在昆明工作的小卫，发现自己对家乡屋后的那片山林越来越眷恋，每逢周末，都要回家看一看，种种树，清清草，2008年春节南方经历了罕见的雨雪冰冻天气，他还和父亲一道种下了62棵杉树，如今，这些树不仅成活了，而且长势很好，受经济危机影响，他所在的企业也遇到了困难，但一想到家里的那片山林，他就觉得有了底气。     

留几个柿子在树上

在老家，老辈人有这么一个说法：天冷吃柿了，不会流鼻涕。用老家的方言来念，这句话其实还挺押韵的。柿子能强筋健骨，保暖御寒，还含有丰富的营养，是药膳俱传的食品。每年，柿子成熟的季节，一大早就能听到窗外传来孩子们的喧闹声，孩了们一个个都抢着爬上树，摘几个柿子来吃。后来，平地起高楼，家家户户都搬进了高楼大厦，那些老房子，不是因无人住而荒废，就是改做其他用途。在寸土寸金的市区，再难有闲置空地供人们种柿子树了，于是，往年树上挂满柿了的盛景自然也不再重现了。     

山水写意六十年——新中国成立六十周年有感

抬头是山，低头是水，六十年的湖南林业青翠了山，染绿了水；俯首是春，仰首是秋，六十年的湖南林业唤醒了春，收获了秋。     

广西林科院：科技助推绿色增长

金秋季节，巴马县所略乡的万亩有机油茶基地内，漫山遍野的油茶树上结满的果实压弯了树枝，绿油油的树叶间同时开满了五颜六色的花朵。果还未摘，花又开了，收获了秋天的喜悦又点燃了明年的希望，争妍斗艳的遍野油条，预示着明年又是一个丰收年。     

古人的植树情结

惊蛰过，春分临，风和日丽，雨水充润。又是一年植树的节日，趁着大好春光植树，绿化环境，也美化了生活。古人勤于植树，树木造福于古人，因而激发了历代文人墨客的诗意，他们常对喜爱的树题诗吟咏，留下了许多植树的诗篇。     

防火人对雨的感情

进入防火期，连续两个多月没有下一场雨，天干物燥，草木冒烟，防火人整天提心吊胆，瞪大两只眼睛盯住老天，盯住森林。“下雨了!下雨了!”终于下了一场大雨，把山浇透了，把树浇透了。防火人激动得像孩子似的，欢天喜地叫起来，手舞足蹈跳起来，哪像早已长大的成年人，哪像老成持重的中年人，这是情不自禁的外露啊!这是发自内心的感情啊!     

春来侗乡林农忙

2月乍暖还寒的时候，在通道侗族自治县双江镇，许多林农正在苗圃里抓紧取苗，公路边到处停放着装运苗木的车辆，田间的忙碌与远处侗族房屋的漂亮整洁形成了一幅和谐的画面。通道县苗木培育产业始于上世纪80年代末，现在全县苗木面积100多公顷，主要采取花木经济合作社联合经营，拥有桂花、红枫、木兰等许多高品质苗木，年均苗木收入达1450多万元。通过培育苗木，许多林农获得了可观的收入，拥有了存款，盖起了漂亮的新房，配置了齐全的家用电器，过上了幸福的生活。     

信息化在辽宁林业种苗行业管理中的应用

针对林业生态建设和产业发展的需要，加大了收集林木种苗信息的力度，使种苗信息通过网上电子邮件传输成为可能，大大提高了工作效率，建立和完善了种苗信息管理制度。开通了种苗网，及时发布本行业信息，提供种苗生产数据，搭建了苗木购售平台，促使交易信息化更加流畅，更加有效。     

CAD与建筑设计的关系

本文分析了CAD在设计中引起的正面和负面影响,并进行了系统的阐述,从而使设计者在应用中能够保持客观的态度。     

森林冠层结构与功能及其时空变化研究进展*

林冠是森林与外界环境相互作用最直接和最活跃的界面层 ,同时 ,它本身又承载了森林生物多样性的主体部分。森林冠层研究的方法和技术在近些年取得了长足发展 ,从而促进了有关林冠结构与功能的研究。这些研究深化了人们对于林冠结构与光能截获以及群落干物质积累之间关系的认识 ,同时 ,对于森林冠层的物质循环和能量传输以及冠层内各营养级之间相互关系动态也有了更为深入的理解。考察森林冠层的结构与功能及其时空变化是深入理解整个森林生态系统的格局、过程及其运作机制的重要基础。     

浅议野生动物所有权

野生动物所有权是所有权的一种,它与其他所有权的区别在于客体的不同。文章阐述了野生动物的内涵,分析了野生动物的分类和野生动物与野生动物资源的区别。在明确野生动物含义的基础上,提出了野生动物所有权的概念,深入论述了野生动物所有权与野生动物资源所有权的差异和联系,并对野生动物所有权的主体、客体、内容进行了分析。     

Persistence of herbicides in forest nursery soils

The persistence of the four herbicides atrazine, hexazinone, lenacil and linuron was studied in forest nursery soils. The adsorption capacities of the soils for the chemicals were described by the distribution coefficients kj and k_oc. Due to the low content of organic matter in the soils the k_a‐values were low, in several cases being <1 for hexazinone. Hexazinone also had the lowest k _oc‐value (30) while the other substances had k_oc ‐values within the range 200–400. In some cases hexazinone showed great mobility under field conditions. The formula c=c_o‐kt^1/2 was used to describe the disappearance of the herbicides from the various soils. The rate of degradation of the four herbicides correlated well with the rate of respiration in the same soils in laboratory experiments, and for linuron reasonably well also in field experiments. In the field experiments the herbicides penetrated the top soil layer. In the subsoil the risk of further transport downward to the drainage system or ground water increased, especially for hexazinone. Linuron as well as the fungicides maneb and tolylfluanid suppressed the decomposition rate of hexazinone in laboratory experiments.     

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。     

Log sawing positioning optimization and log bucking of tropical hardwood species to increase the volume yield

The sawmill industry is a very important link in the Mozambique forest products value chain, but the industry is characterized by undeveloped processing technology and high-volume export of almost unrefined logs. The low volume yield of sawn timber has been identified as a critical gap in the technological development of the industry. To improve the profitability of the industry, there is thus a need to develop methods and techniques that improve the yield. In this paper, different positioning of logs prior to sawing and the possibility of increasing the volume yield of crooked logs by bucking the logs before sawing have been studied. A computer simulation was used to study the cant-sawing and through-and-through sawing of the logs to determine the volume yield of sawn timber from the jambirre (Millettia stuhlmannii Taub.) and umbila (Pterocarpus angolensis DC.) species. The optimal position, i.e. the position of the log before sawing that gives the highest volume yield of sawn timber for a given sawing pattern when the positioning parameters, offset, skew and rotation, are considered gave a considerable higher volume yield than the horns-down position. By bucking very crooked logs and using the horns-down positioning before sawing, the volume yield can be of the same magnitude as that obtained by optimal positioning on full-length (un-bucked) logs. The bucking reduces the crook of the logs and hence increases the volume yield of sawn timber.     

丽水市竹产业化建设进展与思考

丽水市是浙江省竹类的重点产区之一。竹子产业化是丽水市“十·五”期间农业产业化的重点。该文分析了丽水市竹产业化提出的背景 ,总结了竹产业化建设取得的主要进展 ,根据发展中存在的问题 ,在观念改变和机制创新、强化科技支撑作用、培植龙头企业、建立运销服务体系以及加强小径竹开发利用等方面进行了深入的思考。     

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．     

Serological marking of <Emphasis Type="Italic">Pnigalio agraules</Emphasis> (Hymenoptera: Eulophidae) for field dispersal studies

The parasitoid wasp Pnigalio agraules (Wlk.) is a key natural enemy of the horsechestnut leafminer Cameraria ohridella Deschka and Dimić (Lepidoptera: Gracillariidae). As a basis for mark-release-recapture studies, aimed at investigating the dispersal of this parasitoid in the field, adults of P. agraules were marked using a vertebrate-specific immunoglobulin (IgG). The marker was later detected by double antibody sandwich enzyme-linked immunosorbent assay (DAS-ELISA). The IgG was either applied externally by spraying or internally by feeding an IgG-enriched diet. Different concentrations of the marker were used and the influence of abiotic (climatic conditions, time elapsed between marking and marker examination) and biotic factors (sex and age of the parasitoids) on the detection of the immunomarker was tested. External marking by spraying led to more homogeneous labelling than feeding the marker. Parasitoids labelled with 0.25 mg rabbit IgG per ten individuals contained enough immunomarker to be easily distinguished from unmarked ones. Neither the climatic conditions nor the sex or age of the insects had an influence on the detection of the marker. The IgG remained well detectable during the entire lifespan of the parasitoids, which was not negatively affected by the marking procedure. Serological marking can be used to investigate the dispersal behaviour of beneficial insects within mark-release-recapture studies.     

In situ forcing of pollen maturation in Jack pine and Japanese larch male cones

Paper bags equipped with a polyethylene window were placed on branchlets 6 and 9 weeks before the time of pollen dispersal of Japanese larch and Jack pine, respectively. This technique produced a localized greenhouse effect around the branchlets, accelerating male cone development. For Jack pine trees, buds in bags with the window oriented upward had the shortest maturation time. In fact, it was possible to collect these pollen cones about 11 days before the unbagged control without decreasing the production of pollen. The mean germination rate of the pollen from the bags with the window pointed upward, however, was significantly lower than the control, by about 15%. Buds in bags with the window oriented downward had an accelerated development of about 9 days (compared to the control) but did not experience a decrease in pollen production or quality. This same technique caused the abortion of male cones of the Japanese larch trees. Thermal probes in the bags enabled us to follow the progression of temperature inside and outside the bags during the development of the male cone in each species. They revealed that the bags increased mean temperature, daily temperature range, and degree-day accumulation, and that this effect was most pronounced for Jack pine, when the polyethylene window was oriented upward.