Fundamental Species Niche: Mechanism of Formation and Ecological Significance

Evolutionary stasis, or the long-term (over hundreds of thousands or even millions of years) existence of species in a phenotypically unchanging state, is conditioned by a counterbalance of directional selection vectors acting in opposition to one another. Fluctuations of living conditions for a species, leading to partial and often reversible disturbances of the counterbalance, lead to the development of redundant functional capacities of organisms. This redundancy determines the boundaries of the fundamental species niche and allows the realized niches of populations to change their spatiotemporal location within these boundaries without disturbing the counterbalance.     

一个适用于区域性大气环境模拟的大气光化学模式

根据“计数物种”法对光化学反应机制的分析,建立了一个适用于区域性光化学反应模拟的模式,该模式能较好地模拟出NO_x、O_3及H_2O_2等大气光化学污染物的变化,在保证模拟准确性的同时,该模式形式简单,有利于在实际大气环境质量模拟中应用.     

四川省海桐花属药用植物的种类与分布

本文介绍了四川省海桐花属药用植物13种1变种的民间疗效和生境分布;首次报道密脉海桐为四川省分布新记录,并列有四川海桐花属药用植物的分种检索表。     

川西草原十字花科油料植物资源的研究和利用

首次对四川西部草原的野生十字花科油料植物资源作了比较系统的调查研究,收集植株和种子标本约12属20种。经过种子油分分析和引种观察,筛选出几种有特种用途且适应力较强的植物资源。这些植物资源是蕴藏量大的食用油料播娘蒿(Descurainia sophia)、菥蓂(Thlaspi arvense),高亚油酸的优质食用油料植物高蔊菜(Rorippa elata),高亚麻酸的工业用油料植物涩荠(Malcolmia africana)、独行菜(Lepidiumapetalum)等。可供进一步的开发利用。     

生物法处理含铬废水的研究进展

随着人类对环境保护的重视和环境法规的日益严格，国内外研究人员纷纷将注意力转向生物法处理含铬废水。文章介绍了惰性生物吸附法和纯种微生物法处理含铬废水近年来的研究进展。     

火电厂废水的净化与回收利用

针对火电厂废水悬浮物含量高、粒径小、难分离、废水量大的特点 ,采用高浊度废水净化技术 ,优化工艺流程 ,实现了火电厂所有废水的净化与回收利用 ,且经济效益显著。     

沿海农田林网建设关键技术的经济学择优

对江苏沿海地区农田林网的经营类型、造林树种、林带配置进行了技术经济学分析和多目标灰色局势决策择优。结果表明：农田林网经营类型宜选择复合经营的果材兼用型林网。造林树种可选择速生丰产的杨树等用材树种和经济效益高的桃树等果树。林网配置在海堤河岸上选择用材树种，营造基干林带，筑起大网格框架；在道路沟渠上立体配置林果树种，营造主林带和副林带，构建中网格；在脱盐排水沟上添加果树辅助林带，建立小网格，形成多树种多林种合作、大中小网格配套、多道防线联防、多效益多产品产出的复合配置模式。     

Effects of mercury contaminated rice from typical chemical plant area in China on nitric oxide changes and c-fos expression of rats brain

IntroductionMercury(Hg) ,asoneoftheprioritypollutantandhottopicinthefrontofenvironmentalresearchinmanycountries ,hasbeenpaidhigherattentionintheworldsincethemiddleoflastcentury .Chinaisthethirdlargestmercuryproducer,GuizhouProvince(2 4°3 0′— 2 9°13′N     

Study on an environmental-friendly and high-efficient fuel cell energy conversion system

The kinds and the distribution of the coal in China are investigated.The results indicated that the 80% coal in China is used by the method of the coal gasification.The possibility of utilization and development of the fuel cell power plant in China is analyzed.A combined cycle generation system is designed.Its net electrical efficiency is about 55%(LHV),which is higher than that of the fire power plant.So it is environmental-friendly and high-efficient generation mode.