环保杀虫装饰涂料

蚊子、苍蝇、螳螂、臭虫、蜘蛛、蚂蚁之类害虫,在家庭、工厂、办公室、医院、学校、酒店等地,随处可见,无处不入.这些昆虫不但给人们的生活带来很多烦恼,更重要的是,他们导致疾病传播,从而严重危害人们的身体健康.所以,根除害虫,改变居住环境,早已成为人们关注的问题.     

绿叶的妙用

苍翠的绿叶世界,不仅洁净空气,使人心情愉快,增强人的体质,而且在创造人类文明中还作出了它应有的贡献。 各种各样的树叶,都含碳、氢、氧、氮、磷、钾、镁、钙、硅等元素,它又含有木质素、纤维素、树脂、果胶、栲胶、淀粉等有机化合物。     

山药栽培与加工

山药又名怀山药、白山药、薯蓣、淮山,其块根肉质细腻,营养丰富,富含多种氨基酸、维生素、淀粉和糖,是一种味美可口的佳肴.另外,山块的块根和珠芽可供药用,具有健脾、固精、补肺益肾的功能,主治肺虚咳嗽、脾虚腹泻、糖尿病、遗精尿频等症.     

聚氯乙烯合金生产技术

当前现代化的航天、航空、汽车、机械、电子、民用建筑、化工等行业迫切要求具备很高的力学性能及耐热、耐磨、耐化学性能的材料.因此高分子材料发展的一个重要方向就是通过对现有聚合物进行物理和化学改性,使其进一步高性能化、结构化、工程化.北京化工大学研制的聚氯乙烯合金是通过挤出机的力学、化学作用及接枝、复合技术使聚氯乙烯塑料工程化,成为物理性能可与ABS相比拟的新材料.聚氯乙烯合金具有高流动性、高韧性,完全可以代替ABS注塑计算机、电视机、冰箱、照相机、仪表等外壳.聚氯乙烯合金还具有良好的耐寒性,可制作各种规格的异型材,包括门窗、上水管道等.产品市场前景好,具有很强的竞争力,有很好的经济效益和社会效益.     

前景看好的高价值树种——麻疯树

麻疯树,又名膏桐、小桐子、黑皂树等,属大戟科落叶灌木或小乔木,可以生长在荒山、荒地等贫瘠的土地上,是一种耐干旱、耐贫瘠的油料植物,主要分布在我国云南、贵州、四川、广东、广西、福建、海南等省海拔300～1600米的荒山、干热河谷地区.     

深圳湾红树植物木榄种源筛选早期试验

分别从海南省的三亚、文昌、琼山、广西的防城,广东省的雷州、廉江和深圳采集木榄胚轴,同时种植在深圳湾作种源试验。通过4a的试验表明,7种种源间的成活率、树高、地径和单株生物量的差异达到显著或极显著水平,其中以琼山种源表现最佳,其成活率、树高、地径和生物量分别为90.0%、1.54m、4.97cm、1.358kg,比表现最差的文昌种源分别提高17.8%、17.3%、12.2%、55.9%,比本地的深圳种源分别提高5.5%、18.2%、9.0%、6.1%。根据种源综合评定结果,各种源的优劣排列顺序为：琼山、廉江、深圳、三亚、防城、雷州、文昌。鉴于文昌、雷州种源在深圳湾适应性差,不宜在本地区种植推广。     

花城之春

春回大地,万物复苏。春天来了,带来了喜悦,带来了陶醉,更带来了大自然的美妙。火红的木棉,艳丽的杜娟,紫色的、白色的、粉色的紫荆……把花城广州的城市出入口、道路、天桥、公园等装扮得姹紫嫣红,美不胜收。二沙岛、麓湖路、流花路、解放路等道路边五彩缤纷的鲜花争芳吐艳,花香扑鼻,满目的花花世界     

古树名木——自然留给人类的宝贵财富

我国古树名木众多,凡古村落、古驿道、古祠堂必有古树。苍郁的古树生机盎然,充满灵气,集古、奇、灵、神于一体;给人以恬静、幽远、清凉、古朴之感。参差错落的古树扩展了空间,浓缩了时间,折射了历史,成为特有的自然     

武义县林业农民专业合作社发展对策探讨

通过对武义县农民专业合作社的组建形式、合作规模、社员投资、经营情况、合作内容、合作能力、合作制度、带动农户等十七方面的四十多项内容开展了调研,分析了林业农民专业合作社发展的现状、特点、成效及存在问题,并从统一思想、提高认识,加强领导、落实责任,加大扶持、优化服务,顺势利导、提升发展,强化宣传、营造氛围等方面,提出了加快武义县林业农民专业合作社发展的对策建议.     

浙江省重点公益林松类生物量模型研究

根据浙江省森林群落和树种分布特点,在浙江省200万hm^2重点公益林范围内,按气候区、林分类型、林龄组成、立地条件、林分组成等设置松类树种（包括马尾松、黄山松、湿地松、华南松和火炬松）典型样地122个,实测标准木255株。通过相关分析表明,树干干重、木材干重、皮干重、枝干重、冠干重、根干重与胸径和树高的相关系数较大,其冠干重、枝干重、叶干重则与胸径和树高以及枝下高有较大的相关系数,从变量得到的简洁性和准确性考虑,经不同模型的拟合和检验,确定了松类生物量各器官的独立模型,总量、木材、树皮、树根、树干的模型结构为W=c1D^c2H^c3,树叶、树枝、树冠的模型结构为W=c1D^c2L^c3;拟合了浙江省重点公益林松类生物量各器官及总量的独立模型和相容性模型,经检验,各模型均具有较好的拟合精度和预估水平,样本总体预估精度指旨标（P％）在多数分量中以相容性模型最高,而且相对误差绝对值指标（E2％）最小,总量、木材,树干、树皮的预估精度超过了独立模型,其他分量仍保持了独立模型的水平;而且相对误差绝对值均略高于或等于独立模型。     

改革和完善森林采伐管理制度,确保生态建设长足发展——以呼和浩特市森林采伐为例

文章根据呼和浩特市森林采伐管理中存在的问题,分析问题存在的原因并提出相应的解决措施,以便适应新时期对森林经营提出的更高要求。同时,对群众反映最大、意见最多和表现最为明显的现行采伐制度的管理方面做了有益的探讨,确保森林采伐既达到保护森林资源的目的,又能够充分调动广大群众参与林业生态建设的积极性,以便早日实现林业生态建设跨越式发展。     

板栗优质高产途径及其技术措施的研究

增加结果母枝粗度、减少生理落果、改善内腔光照条件、适当控制树冠体积、提高栗棚内的栗果数与栗果重、缩短由小年到大年的时间,以及适时防治病虫害是板栗优质高产的有效途径。同时提出了实现各途径的主要技术措施。     

林木低磷胁迫适应机制研究进展

土壤有效磷缺乏在自然环境中是一种非常普遍的现象,近年来世界各国针对植物的觅磷和耐磷机制进行了大量研究,然而目前相关的综述性报道多限于农作物,对林木低磷胁迫适应性的综述性报道尚不多见。在长期进化过程中,林木为利用土壤中现有的含量极低的有效磷,形成了各种适应低磷胁迫的机制。文中从林木根系的形态学变化、根系分泌物对土壤难溶性磷的活化作用、林木对土壤低浓度有效磷的吸收利用以及应对低磷胁迫的遗传调控等方面综述了低磷环境中林木的适应机制,为揭示林木对缺磷环境的适应机理、发掘林木自身对土壤有效磷高效率的吸收利用能力、以及进一步筛选林木的磷高效品种和合理经营管理人工林提供参考。     

培育森林资源要走内涵增长的新路子

本文提出了培育森林后备资源的指导思想要实现６个转变：（１）森林更新方式由营造成片人工纯林为主向“人天混”上转变，（２）森林培育方式由粗放经营向集约经营上转变；（３）森林培育重点由人工造林向抚育天然幼壮林上转变；（４）种苗工作由常规技术向生物遗传工程技术上转变；（５）经营机制由单一全民造林向多元化造林上转变；（６）营林机构单一职能部门向公司化转变。这些举措对森林经营和营林体制改革都具有现实意义。     

Current Research and Development on Deformation and Fixation of Bended Wood and Wood-based Composites

There are many advantages of bended wood,such as good-looking shape,simple process and low cost.The product,however,is easy to get recovery,which is urgent to be dealt with.This paper concludes the features of deformation and recovery of bended wood and wood-based composites and summarizes four treating methods to keep dimensional stability.Compared to bended solid wood,some elementary perspectives on the research of bended wood-based composites are presented.The purpose of this paper is to suggest:1)to investigate the optimum heating time and temperature that bended wood and wood-based composites need from the formation of deformation to the recovery and to the permanent fixation,according to its changes of dimensional stability such as curvature radius;2)to measure the composites comprised of wood and adhesives on the changes of stress relaxation,dynamic viscoelasticity and crystal1ization field;3)to quantitatively analyze changes of the major components in wood cell wall polymers as well as the composites under heat/steam treatment and untreated conditions.It will be helpful for subsequent research to clarify on the mechanisms of permanent fixation of bended wood and also contribute to that of wood-based composites.     

Risk Perception Among Non-industrial Private Forest Owners

Based on an enquiry, risk perception among non-industrial private forest owners is described in relation to climate change and forestry hazards. Of the respondents, 11% took action to remedy the effects of climate change. Out of a given set, hazards were ranked according to each respondent's experience of recent substantial financial loss to the estate and in relation to his or her willingness to make investments aimed at risk reduction. For each hazard, the respondent assessed the risk in four classes ranging from very high to negligible risk. Six hazards were considered most problematic in all three aspects: browsing damage, falling timber prices, damage by wind, spruce bark beetle, root rot and pine weevil. A majority of the respondents claimed to take action to reduce the risk associated with at least one hazard, while 35% did not know whether they did. Excluding climate change, the need for decision support was the largest in relation to damage by wind owing to a combination of perceived high risk and a high level of ignorance in relation to whether risk-reducing measures were taken.     

The challenges of effective model scoping: A FLORES case study from the mafungautsi forest margins,Zimbabwe

This paper explores the challenge of defining the scope of a systems model, emphasising three aspects: boundary, granularity and conceptual scope. The significance of these is illustrated by reference to a model of land-use decisions made in villages bordering on the Mafungautsi forest in Zimbabwe. The purpose of this model was to help policy players (Forestry Commission staff, non-governmental organisations, researchers and local people) to understand the impact of policy interventions on local people’s livelihoods. Scoping decisions that were made in building the Mafungautsi model were deliberately liberal, to encompass the interests of all participants in the modelling process. These decisions now present a range of serious challenges: the difficulty of model calibration, the computational expense of running simulations, and the difficulty for new users to understand the model. Facilitators of modelling teams need to consider the serious implications of giving everyone what they want and including all participants’ ideas in a model. In the long run, it may be better to be tough and reject many suggestions at the outset. The former approach is unlikely to lead to a tractable model, while the latter may ultimately offer greater satisfaction for all. We are grateful to the UK’s Department for International Development (DFID) and the European Community for financial support of this project. Thanks also to all of the ACM team who have contributed ideas on the process and content of the modelling work and who make it fun to undertake collaborative research. Thanks also to the participants in the Zimbabwe FLAC workshops for their input into the specification of the Mafungautsi model. Finally thanks to Robert Muetzelfeldt, Jasper Taylor, Jonathan Massheder, Fergus Sinclair and Jerry Vanclay for helping us to ride on the FLORES bandwagon.     

西北型日光温室内不同风速对甜瓜叶片光合、呼吸等生理指标的影响

试验以优选早蜜甜瓜为试材,研究了不同风速对甜瓜叶片光合、呼吸、蒸腾速率的影响规律。结果表明,从气孔导度来看：1．5m／s时对甜瓜新叶生长最有利,0．7m／s时对甜瓜老叶生长最有利;从胞间CCh浓度来看：0．7m／s时对甜瓜新叶生长最有利,0．7m/s时对甜瓜老叶生长最有利;从净光合速率来看：0．7m/s时对甜瓜新叶生长最有利。0．9m／s时对甜瓜老叶生长最有利;从蒸腾速率来看：0．5m／s时对甜瓜新叶生长最有利,0．7m／s时对甜瓜老叶生长最有利。鉴于0．7rids风速对实验中10项指标中的5项有利。因此：甜瓜温室栽培的风速应以0．7m／s为宜。     

我国国家公园建设中社区权利新探

国家公园建设中的社区权利是社区面向国家公园建设中其他治理主体的权利,是贯穿于整个国家公园建设全过程的权利,是一种兼具“公权利”与“私权利”色彩的双重权利。国家公园建设中的社区权利可以分为行动权利和接受权利,前者主要包括知情权、评论建议权、信息发布权以及动议权等,后者主要包括接受生活扶助权、获得平等对待权、获得通知权以及获得理由权等。《中华人民共和国宪法》为我国国家公园建设中的社区权利提供了根本性规范依据,相关文件与地方立法则为国家公园建设中的社区权利提供了直接规范依据。     

基于WSR系统方法论的森林系统观和林业系统观

文章在介绍物理—事理—人理系统方法论的基础上,着重阐述了如何将物理的方法论应用于森林生态系统观,将事理的方法论应用于林业系统观,将人理的方法论应用于森林可持续经营。