Abstract:

In order to clarify the change characteristic of Hylobitelus xiaoi population, a field observation was conducted in 11 plots in Wuyishan scenic region from 2005 to 2007, and the collected data were used to further analyzed the relationship between population and environmental factors by using an integrated correlative method. The selected forest factors had marked influence on Hylobitelus xiaoi population dynamics( R =0.861 9, P <0.001), and their importance was in an order of coverage, slope location, slope direction, tree height, elevation, close degree and forest age. Similarly, the selected climatic factors had remarkable influence on Hylobitelus xiaoi population( R =-0.530 9, P <0.05), and among them the mean humidity played the most important role, followed by total rainfall, mean temperature, maximum temperature difference and air pressure. Additionally, there was a significant correlation between diameter of pine breast height and Hylobitelus xiaoi population, and the pest seemed to mainly attack the pines with the diameter ranging 21~60 cm. These results suggested that the ambient factors had important effects on Hylobitelus xiaoi population, and the integrated correlation could be a practicable and innovative method for analyzing of environmental effects on the pest population.

Key words: Hylobitelus xiaoi, ambient factor, climatic factor, integrated correlative analysis