园林植物病虫害系统控制的几点思考

分析了园林植物病虫害系统控制的重要性,针对园林病虫害系统控制的特殊性,从园林健康方面,提出了园林植物病虫害系统控制需注意的几个主要问题:园林工作者要具有园林健康意识,注重园林植物病虫害系统控制的科学性和前瞻性;建立本地区的园林植物病虫害和天敌以及小环境的系统网络体系,重视园林植物病虫害系统控制的目标化;乡土树种的合理利用和优质苗木的选育;进一步探索园林健康及病虫害系统控制的论证。     

论工业人工林的生态经济特点

作者认为工业人工林是生态林业发展模式实施的重要环节,在我国林业发展中将扮演重要角色,但其生态结构单一,稳定性差,是一个高度输入输出的开放型林分。在各国的实践中,经济效益的高低并无定论。必须依据我国的国情选择适宜的发展方式,以保证其健康发展。     

Forest resources variation along with the main rivers in typical forest region of Changbai Mountain

The restoration of the riparian vegetation disturbed by human activities is one of the hotspots of watershed ecology. Through interpreting the images of Remote Sensing in 1985 and 1999, the basic information of forest resources of Lushuhe Forest Bureau, which is a typical forest area of Chanbai Mountain was obtained with support of GIS. By dividing Land covers of Lushuihe area into 10 types (water body, residential land, stump land, farming land, wetland, mature conifer forest, midlife conifer forest, mature broadleaf forest, midlife broadleaf forest, and man-made young forest) and dividing the riparian zone into four buffers (in turn 1000, 2000, 3000, 4000 m away from the river), the changes of riparian forest resources during 1985–1999 were analyzed. The results showed that the deforestation intension has obviously decreased and the whole environment has been evidently improved, but the riparian ecosystem was still flimsy. In buffer 1, 2, 3 the area of midlife conifer forest increased largely, but the areas of other types of land covers all decreased. Midlife conifer forest had a comparatively good status in the three buffers. In buffer 4, midlife conifer forest, mature conifer forest, and mature broadleaf forest formed a forest-age rank that is helpful to stabilize the forest ecosystem and exert its functions. Area percentage of wetland decreased in buffer 1, buffer 2, and buffer 3, even in buffer 4 in which forest ecosystem rehabilitated comparatively well, so protecting and rehabilitating wetland is a very difficult task. Foundation item: This study is supported by major projects of Knowiedge Innovation Program. Chinese Academy of Sciences (No. KZCX2-SW-320-3) and Institute of Applied Ecology (a grant SCXZD010-01), CAS. Biography: HAO Zhan-qing (1962-), Male, Ph. Doctor, Professor in Institute of Applied Ecology, Chinese Academy of Science, Shenyang 1100016, P.R. China Responsible editor: Chai Ruihai     

Preliminary study of application effect of bamboo vinegar on vegetable growth

1 Introduction Bamboo vinegar is a condensed acidic liquid obtained in the process of producing bamboo charcoal. It has a special smoky odor and its color is light-yellow to brown. There are over 200 kinds of chemical compo- nents involved and these components mainly include organic acids, phenolic, alkone, alcohol and ester compounds. Of these, acetic acids are the main com- ponents, accounting for about 50% of the organic chemicals. Bamboo vinegar has been found to have an effect on improvi…     

废物交换是实现循环经济的重要途径

近年来，我国经济迅速发展，但同时也产生了许多环境问题，特别是废物问题成了当今世界的严峻问题，对废物的处理和利用已日益成为环境科学亟待解决的问题之一。受到各国的重视。如何将这些废物资源化，一个较好的途径就是利用循环经济理论，在企业之间进行废物交换，更好地保护环境。     

PV聚氨酯密封胶在高寒地区水泥混凝土路面的应用

详细地介绍了PV聚氨酯密封胶在高寒地区水泥混凝土路面接缝养护上的应用情况，阐述了PV聚氨酯密封胶的施工工艺和施工方法，对接缝料的配比试验和施工工艺提出了相应的技术要求。同时，分析了使用该材料的经济效益，肯定了在高寒地区的可用性和可推广性。     

准连续T型梁桥支座替换工程施工技术

橡胶支座应用广泛，但由于产品质量、使用寿命、老化等问题，所以支座替换成为工程界关注的问题。本文着重介绍准连续T型梁桥支座替换工程施工技术，并分析支座病害原因。     

核桃花粉营养成分分析与评价

分析测定了核桃花粉营养成分,结果表明蛋白质含量26.59%、氨基酸含量23.70%,高于其他花粉;还原性糖、蔗糖含量较低;脂肪含量稍高,为5.45%;必需氨基酸含量为9.61%,E/T比值为40.55%,蛋氨酸和胱氨酸为其限制性氨基酸.必需氨基酸的组成与比值与理想蛋白质中人体必需氨基酸的模式接近,氨基酸分75.14.测定的维生素中Vc含量每100 g最高达114.46 mg.与其他花粉比较,核桃花粉每100 g中有高钾(920 mg)、低钠(2.8mg)的特点,且镁(190 mg)、磷(650 nag)、钙(150 nag)含量较高;微量元素中锌(5.7 mg)、硒(0.017 mg)含量较高.     

浅论建筑工程质量监督机构对工程监理质量行为的管理

随着工程质量管理工作的逐步完善,工程监理的质量行为直接关系到工程能否达到使用功能及建设项目的投资效果.政府及其委托的工程质量监管部门对监理质量行为的控制是保障工程质量的重要管理环节.     

应用菊酯油烟剂喷烟防治杉木种子园害虫试验

1993-1994年在洋口林场应用3Y－25型脉冲式烟雾机喷施0．05％溴氰菊酯油烟剂防治杉木种子园害虫的试验。结果表明：菊酯油烟剂喷烟可同时防治杉木球果麦蛾、杉木蝙长蝽及杉梢小卷蛾的成虫和幼虫。二次处理区球果虫害率比对照下降45．6％。