A CONSERVATION ASSESSMENT OF CENTRAL AMERICAN VEGETATION AND ECOREGIONS

Acomprehensive,standardized,andthematicallyappropriatemapofCentralAmericanvegetationandlandcovertypeswasdevelopedbyclassifyingtheremotesensedimagery(AVHRR)1km²     

引子渡水电站建设过程中出现的主要工程地质问题及处理对策

在岩溶地区筑坝将遇到各种复杂的地质问题,文章重点介绍了贵州引子渡水电站建设过程出现的边坡稳定、溶洞涌水、诱发地震等几个主要工程地质问题及处理方法,可供其它工程借鉴和参考。     

山区高速公路环境影响及减缓措施探讨

从粤东北山区自然环境特征出发，分析了梅河高速公路建设项目可能对环境带来的不良影响，借鉴国内外公路环保科研成果，对山区高速公路建设中存在的一些特殊环境问题提出了减缓不良影响的措施。     

The prevention principle

Environmentally sound manufacture does not have its source only in developing and improving the techniques for treating solid, liquid and gaseous wastes at the end of the production process. Our experience shows that more effort and capital budgets must be devoted to developing preventive measures. Although the treatment techniques have become very advanced and meet ecological requirements to a very high degree, they are now reaching the limits of their technological and economic feasibility. Environmental protection at the production site has undergone structural change in recent years. The emphasis has shifted to preventive techniques which affect the production process itself, avoiding the emergence of waste at the “end of the pipe” by preventing its formation or recycling it straight away. This integrated approach is in harmony with the demands of sustainable production. The functions of in-process environmental protection measures need to be looked at as a whole from the points of view of both environmental protection and cost-effectiveness. Some integrated methods are described.     

基层环境执法存在的问题及对策浅析

阐述了环境执法中存在的问题，指出了真正造就一支“来之能战，战之能胜”的高效、廉洁、文明的环境执法队伍，必须加快立法步伐，加大环境法制宣传教育力度，提高环境法制意识，进行行政管理体制创新，改革机构，打破地方政府“供养制”，加强环保执法队伍的建设。     

Allelopathic potential of Medicago arborea, a Mediterranean invasive shrub

Summary. Biological invasions are nowadays a major problem in ecology. Allelopathy has been shown to be involved in such invasions, but this mechanism has been little studied in France. The objectives of this study were to evaluate the allelopathic potential of Medicago arborea, an invasive species in the French Mediterranean region. Foliar extracts were tested on three target species (Lactuca sativa, Lepidium sativum and Linum strictum). We showed that Medicago arborea has high allelopathic potential to affect the growth and germination of other species. Yellow flax (Linum strictum), native to the invaded area, was the most sensitive of the tested plant species to foliar extracts of Medicago arborea. Our study pointed out the role of allelopathy in processes leading to biological invasion, and more generally in population dynamics.     

Effects of Cattle Grazing on Diversity in Ephemeral Wetlands

Abstract:  Cattle are usually thought of as a threat to biodiversity. In regions threatened by exotic species invasion and lacking native wild grazers, however, cattle may produce the type of disturbance that helps maintain diverse communities. Across 72 vernal pools, I examined the effect of different grazing treatments (ungrazed, continuously grazed, wet-season grazed and dry-season grazed) on vernal-pool plant and aquatic faunal diversity in the Central Valley of California. After 3 years of treatment, ungrazed pools had 88% higher cover of exotic annual grasses and 47% lower relative cover of native species than pools grazed at historical levels (continuously grazed). Species richness of native plants declined by 25% and aquatic invertebrate richness was 28% lower in the ungrazed compared with the continuously grazed treatments. Release from grazing reduced pool inundation period by 50 to 80%, making it difficult for some vernal-pool endemic species to complete their life cycle. My results show that one should not assume livestock and ranching operations are necessarily damaging to native communities. In my central California study site, grazing helped maintain native plant and aquatic diversity in vernal pools.     

湘潭某新建小学安全现状及管理措施研究

为减少湘潭某新建小学校园安全事件的发生,本文采用安全检查表对该校进行安全隐患排查,通过排查发现该校存在一定的安全隐患问题,主要集中在“物的不安全状态”和“不良环境”2个方面,针对隐患依据4M理论从“人—机—环—管”4个方面提出合理可行的安全管理措施及隐患消除方法。经分析,该校校园环境中存在的安全隐患可通过采取科学有效的方法进行治理。希望本研究可以为小学校园安全管理提供一定的思路。     

木材工业粉尘污染与防治对策探讨

从宿迁市木材工业粉尘污染控制现状存在的问题入手,分析了木材工业企业粉尘污染的原因,提出了控制粉尘污染的若干建议。保护环境是实现木材工业可持续发展的必然要求,必须从工艺、技术和装备方面控制生产过程中的粉尘,使作业环境和大气污染排放达到国家环境保护标准和法规的要求。     

关于海洋环境文化建设与海洋环境保护的若干思考

海洋环境文化是海洋文化和环境文化的一个分支,其建设状况对海洋环境保护影响甚大.本文从引入海洋环境文化的概念入手,探析其内涵及重要性,分析了海洋环境文化与海洋经济的辩证关系,并就海洋环境问题,从海洋环境文化层面剖析原因,提出了海洋环境文化建设的对策思路.