![]() That makes the quantity and size extends and urban structure and function translate.ĭamo Logyğrom the change of population quantity in urban regions Rural urbanization is the process of people flowing from rural region to urban region and gathering in cities. Ooniologyğrom the density, depth and scope Rural urbanization is a process of rural community becoming urban community, rural population, secondary and tertiary industry translating to urban regions. Relation between urban and rural economy caused by productivity developing which result in rural residents gathering in special area and translation from rural physiognomy to urban sight. YingLietaE nPmcedianmii ronmental 2ciencesll)201C) 893 - 898 Selection and/or peer-review under responsibility of the Intelligent Information Technology Application Rural urbanization isġ878-0296 © 2011 Published by Elsevier Ltd. Geographyğrom the change ofĜity is the center of all kinds of activities in the certain area. ![]() That is economic activities translating from primary industry to the secondary and tertiary industry, and rural consumption style translating to urban style. Table 1 Definitions of rural urbanizationĮconomicsğrom the relation between economy and town Rural urbanization is a representation of translation of society-economy structure. The definitions of rural urbanization in different research fields are different, they are showed in tableĢ. Keywords: Beijing rural urbanization environmental problems domestic waste agricultural industry Selection and/or peer-review under responsibility of the Intelligent information Technology Application Research Association. This paper provided some references for the sustainable development of rural development in Beijing. ![]() On the basis of analyzing the process of rural urbanization in Beijing since new china was founded, the paper made a systemic discussion on the main environmental problems emerged during the process of rural urbanization. But eco-environmental problems gradually became more and more outstanding during the process of rural urbanization and became the limit factors of rural comprehensive development. Key Laboratory of Urban Stormwater System and Water Environment (Beijing University of Civil Engineering and Architecture), Ministry of Education, Beijing, 100044, China, the comprehensive development of society and economy in China, rural urbanization is the inevitable trend of rural development. Study on the Development of Rural Urbanization in Beijing Procedía EnvironmentalSciencesll(2011) 893 - 898 Their pollen resemblence implys that their relationship is possibly closer than cycads with other extant taxa of gymnosperms.Available online at SciVerse ScienceDirect Similar pollen type is found only in the genus Ginkgo. The genus Cycas is similar to other genera ofcycads in pollen morphology. The interspecific differences are very obscure, implying a natural group of Cycas. The distal surface are smooth or rarely minutely warty while on the opposite face it is perforate of foveolate. The inner surface of the furrows are ofter wringled with strips. The opening or closure of the furrows and pollen shape change when th grains are dry or moistened. In shape they are elliptic or circular on AMB, and boat- or kidney-shaped on equatorial contour, with a single deep and longitudinal furrow reaching from end to end on distal face. The pollen grains are of medium size, with polar axis 26.5-35.7 /^m, and equatorial ax-is 20.6- 26.4 fim in length. The pollen morphology of the genus Cycas from China has been investigated under LM and SEM. Among of them, tropical India, Himalaya-Indochina, Sino-Himalayan and endemic to east Himalayan are the most abundant. They are tropical India, Himalaya to Indo-China distribution pattern, Indo-China to west Himalayan distribution pattern, Himalayan to Japan distribution pattern, Sino-Himalayan distribution pattern, endemic to east Himalaya, endemic to Tibet and endemic to China distribution. Beech plants in Tibet are divided into 7 kinds of floristic elements. Floristic elements analysis are also made at present paper. lamellosa are dominant in the area of southeast Tibet, altitude range from 1800 to 2500 meters. xizangensis are dominant elements in vegetation of river gorge area altitude below 2000 meter of southeast Tibet and Q. ![]() tribuloides, Lithocarpus collettii and L. Most of them are concentrated in river gorge area of southeast Tibet particularly, Medog and Nyalam of Himalayas. There are 3 genera including 33 species of Fagaceae in Tibet, Castanopsis with 7, Lithocarpus 11, Quercus 15 (subg. Distribution of Fagaceae from Tibet has been discussed based on field expedition in Tibet and taxonomical research at present paper. ![]()
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