城市生态用地分类及其规划的一般原则

城市生态用地的规划布局是城市规划的难点之一,也是急待解决的问题.本文根据城市生态系统的特点,给出了城市生态用地定义,指出城市生态用地同时具有自然属性和社会属性,依据这个特点,将城市生态用地划分为服务型生态用地和功能型生态用地两大类型,并结合具体的城市生态规划对各种类型的生态用地规划进行了定性分析.

中国绿球藻目的新种和新变种

饶钦止和沈国华等人于1950，1952，1953，1955和1990年自湖北、江苏、广西和黑龙江等地采得标本，经鉴定表明，它们为中国绿球藻目（Chlorococcales），分隶于6属的8个新种和4个新变种。模式标本保存于中国科学院水生生物研究所藻类标本室（HBI）。

梁子湖罧业的调查

<正> 罧是我国古代就开始运用的一种渔法,早在尔雅释器篇中就有:“今之作椮者,积柴木于水中,鱼得寒入其里藏隐,因以薄围捕取之”之说。湖北省黄岗专区湖泊概况(1952)中所载梁子湖罧业操作的方式也基本相同(详见下节)。该书中并提出梁子湖罧业的产量是十分高的,象1951年在公私合营栈子石一个罧区就捕得鱼一千多担。然而,关于这一渔法可以捕获那些性质的鱼类以及这些鱼类为什么会集中到罧区来的问题已往还没有人去研究过。本所梁子湖工作队的一部分同志曾在1955年4月到1956年2月之间实地

五里湖的枝角类

<正> 1951和1952两年,中国科学院水生生物研究所进行了江苏无锡五里湖的集体调查工作,经常每隔半月在湖内探集水样、浮游生物标本及湖底动物标本。本文所用枝角类材料,主要的是取给于定期采集所得到的标本。另外,还时常在湖边近岸水域及沿湖的鱼池中随时采集标本,补充定性材料。现经鉴定的技角类共有30种及1变种,隶属于18个属,6个科。其中大多数种类属于溞科(Daphnii-

Light and scanning electron microscopic study of Balantidium ctenopharyngodoni Chen, 1955 (Class : Litostomatea) from China

Redescription of Balantidium ctenopharyngodoni "Chen (Acta Hydrobiol Sin 1:123-164, 1955)", collected from the hindgut of grass carp (Ctenopharyngodon idella), especially the segment of 6-10 cm upstream from the anus, from Honghu Lake, Hubei Province, central China in November 2005, is presented in this paper to complete Chen's description at both light and scanning electron microscopic levels. Some revisions were done: the vestibulum is fairly symmetrical, with compactly arranged cilia rather than assembled membrane bordering on the left vestibular side; four contractile vacuoles actually exist in the latter body, three of which surround the posterior portion of the macronucleus, whereas the fourth lies antero-left to it. Somatic monokinetids were compared among the species of genus Balantidium. The cysts were described, and possible infection routes of B. ctenopharyngodoni were also discussed.

Hadron physics programs at HIRFL-CSRm: Plan and status

An internal target experiment at HIRFL-CSRm is planned for hadron physics, which focuses on hadron spectroscopy, polarized strangeness production and medium effect. A conceptual design of Hadron Physics Lanzhou Spectrometer (HPLUS) is discussed. Related computing framework involves event generation, simulation, reconstruction and final analysis. The R&D works on internal target facilities and sub-detectors are presented briefly.