CURRENT STATE OF PLANTING OF URBAN FORESTS AND THEIR USE

The studies performed in a particular metropolitan area and the approaches used can be applied in assessing the ecological status of other cities. In practical terms, the results can be used to develop the concept of greening urban areas, creating databases and organizing continuous monitoring of plantations and soils of recreational areas as well as to study and implement standards of maximally allowable air pollutants influence on the plantation and soil of a city.Urban growth and an increase in areas of urbanized territories, observed in recent decades, create many crisis environmental problems. Within cities we have an integral effect of a large number of negative factors leading to significant deterioration of living conditions. First of all, modern urboekosistema is characterized by high levels of pollution, connected with intensive development of industry and transport. Within a city and its surroundings also a number of climatic characteristics change, the transformation of vegetation and other processes take place. The study of the ecological situation in cities is one of the priorities in environmental research. In the process of city formation its natural ecosystem gradually degrades and its place is occupied by a completely new man-made system (urboekosistema), which is characterized by specific features. The main negative impact on the city ecosystem is made by such factors pollution, industrial emissions, exhaust fumes, noise and thermal pollution and an increase in recreational load.Natural ecosystems, including those located within a city, are endowed with the possibility of self-organization, which gives them the opportunity to consistently and efficiently operate in the prevailing circumstances. Any changes of these terms and conditions may be considered as external loads on biogeocoenosis and its components. If the load exceeds the range of stability of the system defined by the internal mechanisms of self-organization, irreversible changes take place up to complete destruction. Thus, the solution to the problem of stability of a city ecosystem requires, on the one hand, the study of natural laws governing its operation, and on the other - the identification and valuation of external loads, destabilizing its status.To increase the comfort of living conditions in the world of building cities greenery is widely used. In the cities of Siberia with its harsh and acutely continental climate and a significant discomfort of living, the importance of forests and green areas as positive environmental factors is particularly high.

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