The status of nitrogen-fixing bacteria in soils of urban forest

Researched nitrogen-fixing bacteria of soil of greenspace Novosibirsk Akademgorod on. The scientific centre was built in the mid-twentieth century and represented a mix of age-old tai-Ki, forest Park and the modern city. Natural landscapes and forests science centre otnosheny to object-there is cultural heritage of the region. Currently, increased recreational and transportation load-ing, which had a negative effect on forest condition. Undertaken a comprehensive study of the soil in which investigated aerobic free-living and symbiotic nitrogen-fixing bacteria of the soil. Determined the incidence and the rate of growth of Azotobacter chroococcum, the content of innespace-tion oligonitrophilic bacteria, the abundance and condition of Bacillus mycoides, the number of bacteroids in the roots of red clover. Analyzed the relationship of Azotobacter with Fusarium fungi. It is shown that in roadside ecosystems is observed the accumulation of copper, lead and zinc that negative-but affects the growth rate of azotobacteria. Strains of Azotobacter, identified from anthropogenic over-strongly contaminated soils exhibit antagonism against micromycetes inhabiting the soil, the SLA-binarysense natural forests. Against the background of pollution reduced content of bacteroids. Ammonium-poziruuschie bacteria detect the polymorphism. Oligonitrophilic bacteria are characterized by the grinding of colonies and decrease in the viable pool to the level of poor soils. The necessity for urgent measures to preserve the natural microbial resource of the soils, the partici-the participants in the replenishment of nitrogen fixed from the atmosphere