Abstract: The spatiotemporal variations in the population structure and distribution pattern of dominant species in Tilia mandshurica forest in Dongling Mountain of Beijing were studied in terms of importance value, size structure, survivorship curve, and point pattern analysis. In the forest, T. mandshurica population had a higher importance value, and belonged to growing population because of the greater proportion of T. mandshurica seedling individuals. Fraxinus rhynchophylla and T. mongolica populations were of stable populations. T. mandshurica population had significant negative correlations with F. rhynchophylla and T. mongolica populations on large scale, and was in clumped distribution.

Key words: Eucalyptus grandis, Soil microbes, Ecological distribution