Biochemical action intensities of soil microorganisms in Changchun City and their influencing factors.
The relationship between the characteristics of microorganisms activities in urban soil and soil physicochemical properties and heavy metals content was studied by the sample collection and laboratory analysis methods. The experimental results indicated that the biochemical actions intensities of soil microorganisms were different. The biochemical actions intensities of the same soil microorganism were different in different domains,and biochemical actions intensities of different soil microorganisms were also different obviously in the same domain. The intensity order of biochemical role of microorganisms on the sensitivity of environment was the ammonification (1.27) nitrogen fixation (0.82) cellulose decomposition (0.74) respiration (0.57).The effect of soil physicochemical properties on it was complex,in which natural water content was the main influencing factor of biochemical actions intensities of soil microorganisms. The action intensities and directions of heavy metals on the biochemical processes of soil microorganisms were different. The biochemical actions intensities and integrated pollution indexes of some microorganisms under control factors changed. With or without control factors,there wasn’t significant correlation between soil heavy metals and biochemical actions intensities of microorganisms.