为害竹子的叶蝉2新种(半翅目:叶蝉科:殃叶蝉亚科)

记述为害竹子的叶蝉2个新种,枝突竹叶蝉(Bambusana brancha sp.rlov.)和雷公山竹叶蝉(B.leigongshana sp.nov.).新种模式标本保存在贵州大学昆虫研究所.     

为害白榆的叶蝉1新种(半翅目:叶蝉科:殃叶蝉亚科)

记述为害白榆的叶蝉1新种:白榆东方叶蝉Orientus ulmeus Li,Song et Yan sp.nov..新种模式标本保存在贵州大学昆虫研究所.     

云南窗翅叶蝉属一新种(同翅目:叶蝉科:大叶蝉亚科)

记述采自我国云南省的窗翅叶蝉属1新种:大斑窗翅叶蝉Mileewaamplimaculasp.nov..详细描记了新种的外部形态特征和雄虫外生殖器构造,并附主要特征图.模式标本保存在贵州大学昆虫研究所.     

杨树抗蝉害性的调查

本文通过对两片杨树林的20个杨树无性系的蝉害调查,初步确认其中3个杨树无性系具较强的抗蝉害性。即Ⅰ—69杨×美洲黑杨(Populus deltoides cv‘Lux’×P.deltoides)的两个无性系52号和66号,Ⅰ—69杨(P.deltoides cv‘Lux’)。     

说蝉

<正>"明月别枝惊鹊,清风半夜鸣蝉。稻花香里说丰年,听取蛙声一片"。蝉在杨、柳和槐树上常见。不见其影,先闻其声。发声的是雄蝉,雌蝉是听众。有人认为它在悲泣,有人认为它在鸣不平,有人认为它在叽叽歪歪,其实,它是在唱山歌求偶呢。如果没有蝉声,夏天都要变成无声电影了。古人以为蝉以露水为生,其实它的若虫要在黑暗的土中生活长达5年以上,以植物根茎的汁液为食,羽化为成虫以     

吃蝉

吃蝉陈文生我这人，对目前新开发的很多食品资源，有些是很难接受的。比如蟋蟀、蝗虫、蜈蚣、豆虫还有苍蝇等等，不用说食，听了就恶心。当然我相信，食品专家们的所言极是：“昆虫的营养价值，比一般肉类要高出数倍；几乎每一种昆虫，都是一座营养宝库。”我也知道，我惧...     

听蝉

居室的窗外，是这座城市里难得的一片绿荫，还有那从绿荫里传出的阵阵令人心悦的鸟鸣。每每进入盛夏，那些脆生生的鸟鸣便稀疏起来了，取而代之的便是那悠悠长长的蝉鸣了。每年盛夏，我都爱听这绿荫中的蝉声。在这市声喧闹的城市里，在我“内心如汤煮”的时候，那悠长而有韵律的蝉声，就像几缕清凉的风从心中轻轻地划过，使我那郁闷而又焦燥的心情，使这座喧嚣不安的城市透出了几许安谧、几许舒坦、几许可人的清凉。躺在树荫下，看着那斑驳而摇曳的树影，听着那树荫中悠悠长长的蝉声，你不觉会惊叹大自然的伟大。心烦意燥、坐卧不安的你也会…     

蝉趣

<正>婶从老家来,带来了一包稀罕物。"这是你小时候最爱吃的东西。"婶边打开包边说。"啊呀!油煎知了鬼!离开家乡几十年,再也没有吃过这小东西了。"我惊叫起来。"在集市上一只知了鬼能卖二三元钱,大家都去摸,它比以前少多了。"婶又说。我拿了一只放在嘴里,细细地品尝:"味道太鲜美了,与以前在老家时吃的一模一样。"我像孩子一样高兴得手舞足蹈。在苏北老家,蝉的俗名叫"知了",它的幼     

觅蝉

正夏天如每日的晨昏一样,总会如期而至,可这个夏天,有些安静,安静到空气中总是静悄悄的。在这静悄悄的气息里,我想起了一种声音,一个在我生命的夏天不断重复的声音,蝉声。忽地,蝉声没了,这让我有些不习惯,有了一种夏天不再是夏天的感觉,是夏天还没来到?还是夏天已经走远。而我此时,明明正盘踞在伏天,却为何听不见蝉鸣,蝉,这些不知疲倦的蝉,哪儿去了呢?我在疑惑,是今年的天不够热的缘故吗?还是城市的集中化,人离自然越来越远了?或许这两者原因     

FORESTAR：A decision—support system for multi—objective forest management in Northeast China

Past monoculture forestry in China has contributed to countrywide ecological disasters and economic difficulties in forestry regions. China‘s new forestry programs, Natural Forest Conservation Program and Returning Farmlands to Forests Program, provide opportunities for ecosystem management of mountain forests in China. A decision support system, FORE-STAR, has been developed for better managing and protecting natural forests in Changbai Mountain area. It uses GIS-based forest inventory data at a scale of forestry bureau. The first version contains two sub-modules: forest operation and forest res-toration. Under each sub-module, users can compare several decision options and make optimal choices. It can help field for-esters, forest managers, and policy makers make multi-objective and consistent decisions in planning forest management at hierarchical administrative scales.     

基于Kano模型的森林公园环境教育需求分析研究——以开封市康平河森林公园为例

本研究以开封市康平河森林公园为例，分析游客环境教育需求，为城市公园环境教育功能的实现提供参考。通过问卷调查、Kano模型与Better-Worse系数法对公园进行需求类型调查、重要程度排序与人群差异化分析。研究表明在五类一级需求中需求重要度依次为设施需求、工作人员需求、教学形式需求、费用需求、活动内容需求，在游客需求差异化分析中园内设施与活动内容需求差异最明显。得出以下结论：应对公园设施进行合理规划；增设咨询服务点及解说设施；设置多种形式的环境教育活动；增设环境教育相关人员岗位并做好培训；注重差异化设计。     

Research trends: Policy impact evaluation: Future contributions from economics

Economic research has become more empirical, and much of the shift has been due to the broad applications of impact evaluation (or IE) methods for measuring the potential effects of policies or programs on outcomes of interest. The objective of this article is to introduce the essential IE methodology and literature to the audience of this journal and discuss how we can take advantage of these research developments to improve the quality of our own work and subsequent publications. Following an overview of the core IE concepts and methods, we will give an overview of the recent uses of these methods to address forest policy issues and outline the basic steps of sampling and data generation involved in an IE study.     

Planted forests: poplars

Poplars (Populus spp.) have been planted in Europe and Asia since very early times. Known in the Near East as the blessed tree, poplars have been the primary timber producer in regions lacking natural forests in the northern hemisphere. Now, though, we are seeing poplar plantations becoming part of the forest resources even in the abundantly forested Pacific Northwest. Though still a minor contributor to the world's timber supply, the area of land planted to poplars is, nevertheless, increasing rapidly, particularly in China, South Korea, and the United States. The 1992 report from the International Poplar Commission listed nineteen countries with at least 10,000 ha of planted poplars and seven with more than 100,000 ha. Much of the success of poplar plantations results from the breeding of fast-growing and disease-resistant poplar hybrids. Accordingly, at least eleven countries support poplar breeding programs. Uses of poplar wood range from peeled poles for rafters and other elements of construction in agrarian economies to the manufacture of paper, plywood, oriented strand board, and engineered lumber in industrial nations. Interest has also developed in poplar plantations as a renewable source of energy.