Abstract: [Objective] Beetles (Coleoptera) are an important biotic component of forest ecosystems, and most of species have the ability to fly. In this study, the beetles were collected in a broad-leaved Korean pine forest by flying intercepted traps, and time dynamics of the beetles were analyzed objectively, which would provide a scientific basis for the protection and utilization of beetles in the broad-leaved Korean pine forest, and for the evaluation of the role of beetles in maintaining forest ecosystems.[Method] The beetles specimen were collected at the whole adult active period by flying intercepted traps with controlled-release lures in 4 sample plots of a broad-leaved Korean pine forest from 2012 to 2013, and the 6 belt transect were set in each sample.[Result] Totally 7 776 individuals of beetles were captured during the investigation, belonging to 33 families and 239 species. Among them, the number of species and individuals in the families of Elateridae, Staphylinidae, Nitidulidae, Cerambycidae were abundant. The dominant groups were different in different collecting time. Elateridae was the dominant group in all 7 collecting time; Staphylinidae was the dominant group in late May and late August. Nitidulidae was the dominant group in late May and early June, and Cerambycidae was the dominant group from early July to late August. The individual number of Elateridae, Staphylinidae and Nitidulidae in late May were significant more than that collected in the other time(P<0.05). The individual number of Cerambycidae was the most in early July. The seasonal change had a significant impact on the diversity index of beetles. The peak period of individual number of beetles was in late May, and it was significantly higher than that of other times(P<0.05). Species number, diversity index, and richness index all peaked in early July; the peak period of evenness index was in late July. The species number and richness index, and diversity index had a significant linear relationship (P<0.05). The increase of species number could lead to the growth of richness index and diversity index.[Conclusion] The temperature and various stand factors in the forest would change in different seasons. The appearing peak of beetle numbers was in late May because of different habits of various groups of beetles. With the passage of time, individual number of beetles decreased rapidly after the end of the eclosion of some beetles. There was a small appearing peak of beetles in early July with the increase of forest temperature and the enrichment of vegetation conditions. The present research showed that there were relatively strong correlations between Elateridae and June, Staphylinidae, Nitidulidae and late May, Cerambycidae and July and August. The present investigation by using flying intercepted traps could greatly improve the efficiency of flying beetle collection, and it could not only enriched the collection method for beetle research, but also help further study on the diversity of beetles.

Key words: broad-leaved Korean pine forest, intercepted traps, beetles, forest insect, temporal dynamics