Abstract: From late August to late September of 2000, an investigation was made on the insect infestation of Quercus liaotungensisacorns in two sampling plots in Xiaolongmen Forest Farm of Dongling Mountain. The results showed that in 2000, the acorn yield in the two plots was 119.15 and 91.23 seeds·m^-2, but the insect-infested acorns were as high as 49.23 seeds·m^-2 and 33.38 seeds·m^-2, occupying 36.93% and 25.96% of the total, respectively. Our previous investigation in 1999 indicated that the acorn yield in the two plots was as low as 13.09 and 7.24 seeds·m^-2, and the insect-infested acorns were 10.87 seeds·m^-2(82.22%) and 5.90 seeds·m^-2 (75.43%), respectively. In the two years, most insect-infested acorns fell at the early period of seed rain, and the insect-infestation rate was higher in low-yield year than that in high-yield year. The high insect infestation of the acorns could be the main factor affecting the seedling regeneration of Q. liaotungensis in this area.

Key words: Coniferous forest, Change detection, Forest dynamics, Landsat TM, Mortality