A system approach is the methodological basis of natural restoration of the disturbed ecosystems. Practical work has a complex character in this positiion. Bioremediation can be effective if the plant communities, soil biota and soil corresponding to phytocenosis is covered by the process of restoration. Conception working out the two-step restoration process of the highly disturbed ecosystems (Archegova, 1995) assumes at the initial stage the intensive agricultural methods of restoration of the soil-plant cover using local species of grasses and mineral fertilizers including a nitrogen one. The potential ability of soil microbiota to fix of molecular nitrogen may be served as one of the criteria of the efficiency of bioremediation of soil-plant cover. It was shown that this ability increased by the developing of artificial phytocenosis and reflected the steps of soil bioremediation. But it is quite evident that application of mineral nitrogen lead to the increase of denitrification and other processes environmental pollution. This question practically is not taken into account in this conception. To decrease the possible negative effects of nitrogen fertilizers and accelerate the first step of bioremediation it is necessary to use a phytocenosis with local leguminous plants which compensate particularly the deficit of nitrogen in soils by the process of symbiotic nitrogen fixation. For the control of efficiency of bioremediation methods, especially at the first step of reconstruction, both processes of nitrogen fixation and denitrification have to be studied. It will help to understand more deeply our mind about the processes of restoration of nitrogen status of disturbed ecosystems and to manage more effectively it's velocity.

G. G. Romanov
Russian Academy of Sciences
Komi Scientific Center, Ural Division
Soil Department, Institute of Biology
Kommunisticheskaya street, 28
Komi Republic
Syktyvkar, 167610  RUSSIA
Phone: (8212) 42-01-63
Fax: (8212) 42-01-63