一体化地籍空间数据库建设的关键问题研究     

雷虎  黄雷鸣 《科技广场》2007,(9):93-96

由于城乡土地建设的发展需要,建立一个能够统一分类、统一调查、统一统计的城乡一体化信息系统便成为了当务之急。本文从建立城乡一体化地籍空间数据库的几个关键问题展开论述,分析了城乡一体化地籍的管理模式,提出了采用SDE来实现空间信息和非空间信息的统一管理,研究了新旧地类的转换和转换方法。  相似文献   

难觅踪迹的白臀叶猴     

毕役 《百科知识》2007,(2S):44-44

白臀叶猴又叫黄面叶猴、海南叶猴、毛臀叶猴等。在分类学上隶属于猴科、白臀叶猴属，因为头骨的差异较大，所以与我国广西等地分布的黑叶猴、白头叶猴等不同属。它的雄兽体形略大于雌兽，体长大约为61～76厘米，尾长约为56-76厘米，体重7-10千克，是体色最绚丽多彩的灵长目动物之一。长长的尾巴为白色，尾巴外围呈三角形的臀盘也是白的，因此得名，雄兽的臀盘上端还有两个白色的圆点，但雌兽没有。  相似文献   

河南山胡椒属一新种     

崔鸿宾 《中国科学院研究生院学报》1987,25(5):412-413

  相似文献   

阴山荠属的校订   总被引：1，自引：0，他引：1  

张渝华 《中国科学院研究生院学报》1987,25(3):204-219

The genus Yinshania was established by Ma Yu-chuan and Zhao Yi-zhi in 1979, when only one species, Y. albiflora Ma et Y. Z. Zhao, was discribed from Nei Monggol.  In the present paper the genus Yinshania is revised and four new species, two new varieties and four new combinetions are reported.  There are so far eight species and two varieties in total in this genus.      Important morphological characters of the genus are analysed, which shows that the lateral nectariferous glands positioned at lateral base of the brevistamens are triangularovoid; there are dense minute pustules on the surface of valves, which is easily neglected because the pustules disap- pear or shrinked when dry; simple or furcate hairs are present in the most species, seldom absent; the shape of pollen grains is relatively steady, elliptic or long-elliptic, with the polar view trifid- circular, the equatorial view elliptic or long elliptic, the aperture 3-colpate, exine reticular.      The type of genus Yinshania is changed.  Cochlearia acutangula O. E. Schulz was published in 1929, but Y. albiflora Ma et Y. Z. Zhao in 1979.  They are the same species and a new com- binetion, Y. acutangula (O. E. Schulz) Y. H. Zhang, is made. Thus, the type of genus Yin- shania should be changed to Y. acutangula (O. E. Schulz) Y. H. Zhang.      Besides, He Ye-qi 6121 (paratype, PE), which is different from Y. acutangula var. albif- lora, is separated from it and transferred the typical variety, Y. acutangula.      According to the characters of fruit shape the genus Yinshania is divided into two sections, namely, Sect.  Microcarpa and Sect. Yinshania, and then Sect. Yinshania is subdivided into two series.      Sect. 1. Microcarpa. Silicles widely ovoid or subglobose, 1-2.2 mm long, 0.8-2.2 mm wide, the ratio of length and width about 1.1.      Sect. 2. Yinshania. Silicles oblong, oblong-ovoid or long-lanceolate, ellipsoidal, 1.5-4.5 mm long, 0.3-1.5 mm wide, the ratio of length and width about 2.5-3.3.      Ser. 1. Henryanae. Raches flexuose; plants densely  hairy; leaves  3-5-foliolate,  seldom pinnatipartite or pinnatisect.      Ser. 2. Yinshania. Raches non flexuose; plants sparsely hairy; leaves pinnatisect or pinna- tipartite.      The genus Yinshania is a genus endemic to China, with their range from eastern Xizang to western Hubei from northern Guizhou to central Nei Monggol.  The taxa are mostly of a small area.  Sect. Microcarpa is concentrated in Sichuan and southern Gansu;  Sect.  Yinshania is spread from Xizang and Sichuan, nouthwards to Gansu, Ningxia, Shanxi, Hebei and Nei Mong- gol (Ser. Yinshania); and from Sichuan south-eastwards to Guizhou and Hebei (Ser. Henrya- nae).  There are five species in Sichuan.  The present paper conjectures that the distribution centre of the genus is in the Hengduan Mountains and its adjacent areas.  相似文献   

中国珠蕨属的分类修订   总被引：1，自引：0，他引：1  

张钢民  张宪春 《中国科学院研究生院学报》2003,41(5):475-482

对国产珠蕨属Cryptogramma R.Br.的分类进行了修订，承认2种1变种，即稀叶珠蕨C.stelleri（Gm l.）Prantl，高山珠蕨C.brunoniana Wall.ex Hook.&Grev.和珠蕨C.bru noniana var.sinensis（Christ）G.M.Zhang。将峨眉珠蕨C.emeiensis Ching&K.H.Shing并入高山珠蕨。同时对该属的系统位置进行了讨论。  相似文献   

浙江东部凤仙花属一新种     

金孝锋  丁炳扬 《中国科学院研究生院学报》2002,40(2):167-169

  相似文献   

中国苹果属植物染色体研究     

梁国鲁  李晓林 《中国科学院研究生院学报》1993,31(3):236-251

本文报道了中国苹果属Malus Mill．21种36类型的核型和6个多倍体类型的减数分裂联会构 型。 (木+多)(木+衣)海棠组Sect．Docyniopsis和花楸苹果组Sect．Sorbomalus中的滇池海棠系Ser． Yunnanenses  属2A型，陇东海棠系Ser．Kansuenses中的变叶海棠M．toringoides和花叶海棠M． transitoria属2A、2B则，三叶海棠系Ser．Sieboldianae属2B型，苹果组Sect．Malus中的苹果系 Ser．Pumilae和山荆子系Ser．Baccatae除小金海棠M．xiaojinensis 2B型外，均属3B型。减数分 裂观察结果有同源四倍体，节段异源三倍体和异源三倍体类型。本文还讨论了种类间在核型上的差异、栽培种的起源，核型的演化趋势以及无融合生殖类型的分类学处理。  相似文献   

湖南杜鹃花属一新种     

刘起衔  张灿明 《中国科学院研究生院学报》1991,29(3):270-271

 Rhododendron shimenense Q. X. Liu et C. M. Zhang (Ericaceae) is described asnew from Hunan Province, China.  相似文献   

内蒙古黄芪属一新种     

蒋志刚  尹祖棠 《中国科学院研究生院学报》1991,29(3):272-273

In this paper one new species of the genus Astragalus L. (Papilionaceae) is des-cribed from Nei Monggol, China. It is A. daqingshanicus Z. G. Jiang et Z. T. Yin.  相似文献   

石囊藻科一新属——蓝树藻属     

王策箴 《中国科学院研究生院学报》1989,27(2):129-131

  相似文献