用溴甲烷熏蒸松材线虫病木处理技术的研究*

用溴甲烷熏蒸松材线虫病木是目前生产上主要的检疫处理方法，本文对影响熏蒸处理效果的单因素分析表明：低温降低了熏蒸效果；增加投药量可提高效果；熏蒸时间以７２ｈ为宜；病木含水率高，熏蒸效果差；堆垛上、中下部的效果依次增高；堆垛的大小则以５０－７０ｍ＾３为宜；病木小头直径为６．０－１７．１ｃｍ之间对熏蒸效果无显著影响，影响处理效果的多因素综合分析表明：影响熏蒸效果的顺序的温、投药量、熏蒸时间。在一定温度条     

木材害虫熏蒸技术的应用与研究

１９９１～１９９３年，针对巴盟地区林木蛀干害虫危害严重的实际，在推广应用磷化铝熏蒸处理技术的同时，开展了不同投药量和熏蒸时间的对比试验，选择最佳投药量及熏蒸时间，杀虫效果均达到１００％，经济效益显著。     

北京新机场将对周围环境带来哪些影响？

日前,备受关注的北京新机场项目终于尘埃落定。随着环境保护部对北京新机场项目环评文件做出审批并公示结束,酝酿多年的北京新机场项目正式取得了环评许可。按计划,这一项目将于2018年建成投入使用。经过为期6年的漫长等待和反复论证,北京新机场的最终位置浮出水面。     

雪松种子的熏蒸处理及其对发芽率的影响

雪松种子的熏蒸处理及其对发芽率的影响翟建中（林业部宁波林校）前言雪松种子小蜂（Ｍｅｇａｓｔｉｇｍｕｓ．ｓｐ）是一种防治上较为困难的虫种，也是一种危害雪松种子严重的危险性害虫。其幼虫由于受到含有较高油脂的种皮保护，所以除害措施尤其困难。经过使用不同方法...     

论园亭造型设计与周围环境的关系

简要介绍了园亭的两种类型,重点论述了园亭与周围环境的关系,为今后的园亭建造提供一定借鉴。     

影响松材线虫检疫检验的因素

本文研究了温度、取样部位和木材含水率对松材线虫Ｂｕｒｓａｐｈｅｌｅｎｃｈｕｓ ｘｙｌｏｐｈｉｌｕｓ检疫检验的影响。结果表明温度是影响检验的主要因素，２０－４０℃是分离松材线虫的适宜环境温度，提高分离用水的起始水温可大大加快线虫的游离速度，取样部位对检验结果有一定的影响，树干同一部分内材线虫的分离率和密度均明显高于外材，松褐天牛Ｍｏｎｏｃｈａｍｕｓ ａｌｔｅｒｎａｔｕｓ化蛹期间蛹室部位线虫分离第和密     

新型钻蛀性害虫熏杀棒药效试验

新型钻蛀性害虫熏杀棒是一种高效虫道熏杀剂，使用该棒防治效果好，对果树天牛平均防效为９６．２３％，桑园天牛平均防效为９７．３５％，葡萄透翅蛾的防效８７．５％，且价格低，省工方便不污染环境。     

浅谈城郊绿化对城市生态环境的作用

我国进入80年代以来,随着工业生产和商业活动的迅速发展,近年不断有人提出建设“森林城”、“生态城”,还有专家对城市绿化提出“生态园林”理论与构想,城市生态与环境问题已经得到广泛的关注。改善城市生态环境,一方面要对污染源采取有效的控制、净化措施;一方面要采取相...     

Effect of environment on the response of Eucalyptus clones to inoculation with Cryphonectria cubensis

The ascomycete Cryphonectria cubensis causes severe losses in Eucalyptus plantations in South Africa and selection programmes for disease tolerance are necessary. The aim of this study was to use two C. cubensis inoculation trials, planted at different locations to assess the disease susceptibility of the clones and the effect of the environment on disease development. These two trials consisted each of 21 Eucalyptus clones (E. grandis, E. grandis × camaldulensis and E. grandis × urophylla). All trees were inoculated with a single virulent strain of C. cubensis and lesion widths measured 6 and 12 months after inoculation. Clones differed significantly in their tolerance to C. cubensis. Further, disease severity differed depending on the geographical location of the trial. A significant clone × locality (genotype × environment) interaction was observed. Therefore, screening for disease resistance should take place only in areas where clones will be commercially grown.     

Comparison of methyl bromide and herbicide effects on endomycorrhizal formation,seedling production,and weed control in sweetgum seedbeds

Sweetgum seedlings were grown in fumigated and nonfumigated nursery plots where equal portions were treated with a preemergence application of 1.1 kg/ha of trifluralin and a postemergence application of 1.7 kg/ha of napropamide. Methyl bromide at 478 kg/ha significantly decreased average root dry weight. Endomycorrhizal formation on one, two, and three month-old seedlings was not significantly decreased by fumigation or herbicide application. Weeding times for herbicide plots were less than half that for fumigated plots. These results show that herbicides can provide better control of annual weeds and produce better sweetgum seedlings than fumigating with methyl bromide.     

德援项目的实施对项目区生态环境的影晌

巴东县实施德援项目 8a来 ,在项目实践过程中学习了德国项目管理的先进经验 ,取得了多项建设成果。项目的实施对提高项目区森林覆盖率 ,保护生物多样性 ,治理水土流失 ,改善项目区生态环境产生了积极的影响 ,并为我县实施天保和退耕还林工程提供了宝贵的经验     

磷化铝熏蒸光肩星天牛虫害木的试验研究

用磷化铝对聚氯乙烯薄膜覆盖下的大官杨、箭杆杨光肩星天牛虫害木进行熏蒸试验表明,当磷化铝用量10～12 g/m3、密封时间为72 h时,杨树天牛幼虫死亡率均达100%,杀虫效果良好.该法使用方便,成本低廉便于推广应用.     

温湿处理环境对木塑复合材弯曲性能的影响

木塑复合材在使用时应考虑不同的环境条件对材料性能的影响,本文研究了不同密度的聚丙烯基木塑复合材经高/低温和浸水处理后材料的弯曲性能的变化情况,为木塑产品的生产和应用提供依据。     

The influence of a prolonged SO2 fumigation on the stomatal reaction of spruce

Spruce cuttings (Picea abies) were subjected to low SO₂ concentrations for almost half a year. Afterwards transpiration and stomatal conductance were measured with a porometer. Transpiration was decreased by SO₂ in light but stomata reacted sluggishly to changed light conditions.     

Aerosols and contact insecticides as alternatives to methyl bromide in flour mills, food production facilities, and food warehouses

The fumigant methyl bromide (MB) is being phased out of production and usage to control stored-product insects in flour and rice mills, as well as feed and food production plants, in the United States and other developed countries throughout the world. A phase-out schedule has also been established for undeveloped counties under a delayed timeline compared to the one established for developed countries. Whole-plant alternatives to MB treatment, such as the fumigant sulfuryl fluoride and heat, can be used in place of MB, but they have some limitations as well, which will be briefly discussed in this review. Hence, residual surface treatments with contact insecticides and insect growth regulators and aerosol applications are receiving increased attention for incorporation into management programs that historically relied on MB fumigations. This review will focus on recent research with contact insecticides and aerosols for controlling stored-product insects in structures and how they can be viewed as options for control to alleviate concerns regarding the phase-out and reduced availability of MB for structural fumigations. A brief discussion of emerging pest species or groups, and how they can be controlled with surface treatments and aerosols, is also included in the review.     

桉树人工林土壤环境对植物种子发芽和生长的影响

桉树(Eucalyptus)已成为我国华南地区很重要的速生阔叶用材树种,在海南已成为仅次于天然林、橡胶林的第三大森林生态系统.但随着大面积营造桉树人工纯林,生产上出现一些负面的影响,其社会效益和生态效益问题日益得到重视,其旺盛的生长是否会造成地下水的过量消耗,大面积的种植桉树人工林从而造成部分林地降低了地下水位、造成土壤的退化和影响林下植物种子萌发、植物的生长,林下植被的减少,土壤的退化等(蒋有绪,1992;王震洪等,1998;陈秋波,2001;林义辉,2001;项东云,2002;黄志宏,2003).