Revision of Urban Greening from Sun, 05/01/2011 - 14:10

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Urban Greening

The development of greening in urban areas

Green areas of a functional purpose are an organic part of the city as within buildings, and beyond.

Placing green plantations in cities

Accommodation in terms of various categories of plantations is directly dependent on their function: to create conditions for recreation of the urban population, to protect the city from strong winds or to protect residential areas from industrial waste, to improve microclimatic conditions for decorating the city streets, squares and neighborhoods . Plantations of common use within the city should be placed uniformly in some areas, in proportion to population density in each of them, at a distance from home, allowing all people to enjoy them with minimal time to travel to these plantations. These provisions do not apply to areas of public recreation, nature reserves, national parks, botanical gardens and ethnographic park. All these objects are among the plantings in general use, but their placement is determined by natural conditions, existing facilities, transport links with the city and others For the uniform provision of the city stands is not enough to create approximately equal to the square green areas at specific intervals, as different areas of the city are not the same population density, and the area stands to be directly proportional to the number of people in the area. In addition, in some areas of the city are usually concentrated large institutions, industrial enterprises, railway stations, big shops, etc. In this connection, in such areas accumulate large numbers of people, far exceeding the number of permanent residents.

The system of urban greening

The system of green areas of the city - is interlinked, even distribution of urban spaces, defined by the existing system for further development, providing for communications with the country stands. Preserved in the city area of natural landscape, at least in the form of a small inclusion in the urban environment, usually creates a unique identity of the city and sometimes more memorable than the urban ensembles. Modern Theory of Urban Development contains the concept of a system of green areas, which permeates the city, have the primary purpose - improvement of the urban environment.

The role of plants in the environment

Features of urban environmental In urban areas creates a specific and largely unfavorable for human life the eco-logical situation. Air basin city is constantly polluted industrial wastes, exhausts of cars and dust. If you compare the city's air with the air atmosphere of a suburban area, then it contains much less oxygen there is an increased number of bacteria and germs. The degree of air pollution depends on the following environmental factors: wind speed and direction, air temperature and humidity, terrain and character of vegetation. In the major industrial cities in calm weather is often a so-called smog, or fog that contains a high concentration of industrial emissions. Smog often causes serious disease in humans. Solid particles of dust being suspended, and to interact with water vapor, and saturating the atmosphere, are compounds harmful effects on the respiratory organs. Dusty air reduces the illumination of the earth's surface and thus reduces the amount of mineral rights to the ultraviolet rays of the sun. Temperature conditions in urban air and moisture prone stronger fluctuations than in non-urban areas. This often creates uncomfortable conditions for the urban population, especially in hot or cold days. Significant negative factor for human life in an urban setting is the urban noise. Often the level of urban noise is much higher than permissible limits, which adversely affects human health. Lately, the noise level in the large cities increased greatly, and the process of increasing the noise continues.