Zn~(2+)浓度对固氮鱼腥藻(Anabaena azotica Ley)光能转化特性的影响

本实验对在不同Zn2+浓度条件下培养的固氮鱼腥藻(Anabaena azoticaLey)的生长、光合放氧速率和叶绿素荧光参数Fv/Fm进行了测定.结果表明,当Zn2+浓度为1.0μmol/L时,其比生长速率(Specific growth rate)最大,光合放氧速率和Fv/Fm值最高.当Zn2+浓度大于等于5.0μmol/L时会抑制A.azotica Ley的生长和光合作用.对在0μmol/L和5.0μmol/L Zn2+浓度下生长的藻细胞藻胆体-类囊体膜复合物吸收光谱的比较和对与5.0μmol/L

High quality CeO2 film grown on Si(111) substrate by using low energy dual ion beam deposition technology

By using the mass-analyzed low energy dual ion beam deposition technique, a high quality epitaxial, insulating cerium dioxide thin film with a thickness of about 2000 Angstrom, has been grown on a silicon (111) substrate. The component species, cerium and oxygen, are homogeneous in depth, and have the correct stoichiometry for CeO2. X-ray double-crystal diffraction shows that the full width at half maximum of the (222) and (111) peaks of the film are less than 23 and 32 s, respectively, confirming that the film is a perfect single crystal. (C) 1995 American Institute of Physics.

用低能离子束淀积技术在硅（111）衬底上生长氧化铈外延薄膜

采用质量分离的低能双离子束淀积(IBD)技术,在硅(111)衬底上共淀积,生长了氧化铈外延薄膜。椭圆偏振仪测得,膜厚2000A。俄歇能谱仪测得,外延层内铈、氧分布均匀,具有很好的正化学比。X射线双晶衍射得到明显的氧化铈(111),(222)峰,半高宽≤23''。

从1995年国际景观生态学大会看当前国内外景观生态学发展的现状

对１９９５年世界景观生态学大会和景观生态学发展的国内外现状进行了思考。当今景观生态学与国际生态学的研究热点（全球变化、生物多样性和持续发展）基本一致，但又有自己的特色，其重点领域包括：①生态空间理论与景观异质性研究；②景观变化模型与未来景观规划；③景观系统分析与ＧＩＳ应用等。由于经济发展和社会生态意识的不同，使得该学科在各地区间的发展很不平衡。着重就我国的本领域研究状况与国际水平作了比较

我国主要类型生态系统结构功能与提高生产力途径研究──KJ85－06项目1991～1995研究进展简介

ＫＪ８５－０６项目是“八五”期间由中国科学院资助的最大的生态学研究计划．１９个研究所、２０个试验站、５３０余名科技人员参加了该项计划，５年总经费１０００万元．研究工作取得了重大进展，迄今已发表论文４５０余篇、专著３部，尚有大量论文与多部专著将陆续出版．本文简要介绍了有关主要研究进展，并就生态系统优化管理研究和生态过程、人类活动影响联网研究提出了两点主张．

Study on spatial pattern of land-use change in China during 1995-2000

It is more and more acknowledged that land-use/cover dynamic change has become a key subject urgently to be dealt with in the study of global environmental change. Supported by the Landsat TM digital images, spatial patterns and temporal variation of land-use change during 1995 -2000 are studied in the paper. According to the land-use dynamic degree model, supported by the 1km GRID data of land-use change and the comprehensive characters of physical, economic and social features, a dynamic regionalization of land-use change is designed to disclose the spatial pattern of land-use change processes. Generally speaking, in the traditional agricultural zones, e.g., Huang-Huai-Hai Plains, Yangtze River Delta and Sichuan Basin, the built-up and residential areas occupy a great proportion of arable land, and in the interlock area of farming and pasturing of northern China and the oases agricultural zones, the reclamation I of arable land is conspicuously driven by changes of production conditions, economic benefits and climatic conditions. The implementation of "returning arable land into woodland or grassland" policies has won initial success in some areas, but it is too early to say that the trend of deforestation has been effectively reversed across China. In this paper, the division of dynamic regionalization of land-use change is designed, for the sake of revealing the temporal and spatial features of land-use change and laying the foundation for the study of regional scale land-use changes. Moreover, an integrated study, including studies of spatial pattern and temporal process of land-use change, is carried out in this paper, which is an interesting try on the comparative studies of spatial pattern on change process and the change process of spatial pattern of land-use change.

二甲基亚砜在稀土穴醚配合物中配位行为的电化学研究

二甲基亚砜在稀土穴醚配合物中配位行为的电化学研究刘世昌（内蒙古师范大学化学系，呼和浩特０１００２２）朱天培（中国科学院长春应用化学研究所，长春１３００２２）有关穴醚与稀土金属离子配合物的性质以及关于它们的电化学方面的研究均尚少￣［１－５］，且不系统。...