Impact on the Microbial Biomass and Metabolic Function of Carbon Source by Black Soil During Rice Cultivation

The effects of rice cultivation to the black soil microbial communities, which the experimentation area of Shuangyang District Agricultural Technology Extension Station in Changchun city, Jilin Province of northeastern China, were studied by using the method of phospholipid fatty acids and Biolog ECO-microplate culture. Results showed that the content of organic matter in space was the highest, fewer in the field, and the minimum in the rhizosphere, that change trend of total nitrogen and organic matter was similar in soil. The quantity of organic matter in summer sample was the highest. The microbial fun6tional diversity was significantly higher in summer than that in spring and autumn and showed no significant difference between spring and autumn. For summer and the lowest in winter, Shannon-Wiener index and Pielou index of the space were higher than the field and the rhizosphere. The time of microbial growth into the stable period and peak value of the average well color development were different in all samples, that the time was 216 h, 192 h, 216 h, 120 h, which varied from 0.52-0.84, 0.82-1.28, 0.40-0.84, 0.05-0.48, respectively. The result showed that the time of microbial growth into the stable period was similar in spring and autumn, the highest was in summer and the lowest was in winter. Above all, these results would provide more important characteristics of microbial features in the degradation and restoration process of the quality of the black soil habitat scientifically.