Abstract: In order to mointor the occurrence of the pine sawyer, Monochamus alternatus Hope, and to prevent the incursion of Bursaphelonchus xylophilus, the effects of meteorological factors and environmental factors on population dynamics of M. alternatus was investigated in 10 locations of Wuyishan Scenic Spot from April to September during 2005-2007. The results showed that meteorological factors and environmental factors composed the main factors that caused quantitative changes of trapped adults and emergence holes of M. alternatus by factor analysis of vectorial progression. The importance of environmental factors influencing the amounts of trapped adults and emergence holes of M. alternatus was in the descending order as follows: the monthly mean temperature, the temperature difference, total precipitation, air pressure and the average humidity. When the data of environmental factors and meteorological factors only were analyzed separately, the importance of environmental factors were in the descending order as follows: slope location, canopy density, coverage degree of ground, elevation, stand age, height of trees and slope aspect; the importance of meteorological factors was in the descending order as follows: atmospheric pressure, average temperature, the temperature difference, total precipitation, and average humidity. It is concluded that environmental factors and meteorological factors may influence distinctly on the population dynamics of M. alternatus.

Key words: Monochamus alternatus, population dynamics, meteorological factors, environmental factors, vectorial progression analysis on factors, Pinus massoniana forest