吉林省西部生态环境与可持续发展现状分析

文章分析了吉林省西部生态环境的优势与存在的主要障碍因子 ,以持续发展理论为指导 ,提出了吉林省西部的发展战略。     

企业科技投入效果分析与预测的微观模型

企业科技投入效果分析与预测的微观模型宋远方，曹文华，李清，汪应洛（西安交通大学管理学院，７１００４９）ＡｎＥｃｏｎｏｍｅｔｒｉｃＭｏｄｄｅｌｏｆＲｅｆｌｅｃｔｉｎｇｔｈｅＢｅｎｅｆｉｔｏｆＥｎｔｅｒｐｒｉｃｓｅ’ｓＳｃｉｅｎｃｅＴｅｃｈｎｏｌｏｇｙＩ...     

野沙梨生态地理学的研究

野沙梨被列为国家珍稀濒危树种。它的分布区类型属于热带印度至华南，特别是西南分布成分。从其分布区类型和形态特征上推断本种为残遗种，起源地可能就在劳亚古陆的南部，当今它的分布区这一范围内。本文讨论了本种的生长环境，生长特性，发育规律，并对其群落组成进行了记载和统计分析，认为其群落特点相似于热带雨林群落。此外，还分析了本种濒危的的原因。     

农业生态与生态农业研究

<正> 农业是人类存在及各行各业发展的基础,而生态环境又是人类生存息息柑关的最重要的问题之一。讲求经济效益、社会效益和生态效益是建设有中国特色社会主义农业的重要指导思想。能否保持农业的生态平衡和保持什么样的生态平衡,它将给我们农业的发展和人民物质生活水平的提高带来巨大而深远的影响。因此研究农业生态与建设生态农业,使农业经济的再生产能够在生态系统协调一致的基础上持续、稳定、迅速的发展,就成为一个十分重要的问题。     

甘肃森林昆虫生态地理亚省级区划探讨 Ⅲ.各亚省级区划内森林主要害虫名录及主要分布地(下)

据1981—1982年全省森林病虫害普查,甘肃的森林害虫共计664种,隶属于8目98科。本文据笔者二十多年收集的资料和《甘肃省林木病虫普查成果汇编》[2],将森林主要害虫三百多种,按五个亚省级区划[1],分别以学名、中名、主要分布地,列表陈述,以供有关高校教学、科研及林业科技人员参考。本文(下)是陇南山地亚省、中部干旱地区和陇东高原亚省区划内森林主要害虫名录及主要分布地。     

果树根外追肥应把握的技术要点浅析

本文作者紧密结合本地实际，详细阐述了对果树进行根外追肥实践中应把握好根外追肥的种类、浓度、部位、时期及防止产生的肥害等技术要点和应注意的五个方面问题，对当前开展的建生态市、产无害果活动有一定借鉴和指导意义。     

Standards of evidence and causality in regulatory science: Risk and benefit assessment

In this paper we analyze the Russo-Williamson Thesis (RWT) as a standard of evidence in regulatory science, in risk as well as benefit assessment. In our analysis we take account of the recent controversies that have taken place in regulation with respect to the evidentiary requirements necessary for regulatory decision making. RWT's main point is that not only probabilistic but also mechanistic evidence is necessary for being able to infer the existence of causal links. We ask in which way RWT could have an impact upon current decision making about subjecting to regulation (or, to the contrary, leaving them unregulated) certain chemical substances, food stuffs, health claims, and other typical objects of regulation. We show that the application of RWT resolves some of the problems posed by current standards of evidence. RWT makes it possible to determine with higher accuracy if a particular substance should be subjected to regulation or not, even though under certain circumstances RWT itself may turn into a source of regulatory error. The adequacy of RWT as a standard of evidence depends on the precise manner of its application to regulation (particularly the consideration of mechanistic evidence as a complementary or necessary requirement), as well as the assessment of its non-epistemic consequences.     

On the polymorphism of cyanogenesis in Lotus corniculatus L.

Most populations of the legume Lotus corniculatus are polymorphic for the characters of leaf cyanogenesis and petal cyanogenesis. The distribution of these phenotypes was investigated in a section of chalk quarry where the vegetation ranged from pioneer species growing on almost bare chalk through to a mature grassland assemblage. The vegetation surrounding randomly chosen L. corniculatus individuals was recorded and this information was used to compare the environments in which the different phenotypes were growing. Leaf cyanogenic plants were found to occur at higher frequencies in grassland areas than in the more open conditions typical of earlier stages in the succession at the quarry. Factors that may be responsible for the distribution of the phenotypes are discussed.     

博物馆展示的生态设计探析

博物馆是一个国家或地区的“文化基因”，是集收藏、教育、旅游等功能于一体的场所。博物馆展示设计是现代展示设计的主要领域之一，在生态理念日益普及的当今时代，对生态与可持续发展的关注将是博物馆展示设计的核。趋势之一。本文阐述了博物馆展示生态设计的重要性以及生态设计的缘起，并结合生态典型实例对博物馆展示的生态设计内容及方法做了初步探讨。