Abstract:

Microflora was investigated by collecting and culturing micro-organisms from the leaves, bark and soil in Populus×euramericana cv.‘Neva’, P.×euramericana cv.‘Guariento’ and P. tomentosa poplar plantations in this study. Firstly, preliminary results indicated that the total quantity of bacteria in P.×euramericana cv.‘Neva’ plantation was remarkably different from that in the P.×euramericana cv.‘Guariento’ and the P. tomentosa, and that on difference was found between the latter two. There were significant differences in bacteria quantity from the leaves, bark and the soil. The quantity of bacteria in P.×euramericana cv.‘Neva’ plantation was the greatest in summer and autumn, while it in P. tomentosa plantation was the greatest in winter and spring. The total quantity of bacteria was the most in P.×euramericana cv.‘Neva’, and more than that in P.×euramericana cv.‘Guariento’ and P.tomentosa. The dominant spaces of bacteria were Pseudomonas sp. And Bacillus sp. And so on, which were widely distributed in the four interfaces of the three poplar plantations. Secondly, the variation of the quantity of fungi in the three poplar plantations had the same pattern as bacteria’s. The quantity of fungi was remarkably different between autumn and the other three seasons. The dominant species of fungi were Marssonina sp.,Prenochaeta sp. And Paecilomyces sp. In the poplar plantations.

Key words: Beijing, poplar plantations, microflora