솔나방의 월동율과 몇 환경요인간의 관계를 알기 위하여 1974-1975년간 이목리 및 칠보산을 대상으로 월동율, 토양함수량, 송수관피도를 조사하였던 바 다음과 같은 결과를 얻었다. 1. 월동율에 있어서 양지역간에 차이를 볼 수 없었으나 칠보산의 분산계수는 28.1%로 이목리의 그것 16.5%보다 커서 칠보산의 표본구간에 불안정성을 보였다. 2. 3가지 환경요인중 토양함수량은 지역간 차이가 없었으나 나지율과 송수관피도에 있어서는 각각 차이가 인정되었다. 3. 월동율과 이들 환경요인간의 관계를 단상관계수로 보았을 때 이목리 조사구에서는 송수관피도, 칠보산 조사구에서는 송수관피도 및 나지율과 관계가 있는 것으로 나타냈으며 편상관계수로 보았을 때 이목리 조사구에서는 동일한 경향을 보였으나 칠보산 조사구에서는 어느 요인도 상관에서의 유의성을 보이지 않았다. 4. 이러한 지역간 월동상태의 차이는 양지역의 생태적차이에서 온 것으로 생각된다.
A. study was conducted to examine the effects of some environmental factors on the overwintering rate of the pine caterpillar, Dendrolimus spectabilis Butler, at Imokli and Mt. Chilbo near Suweon, Kyunggi-do. The results are as follows: 1. No significant difference in the overwintering rate was observed in two surveyed sites. The coefficient of variation in the overwintering rates of the pine caterpillars was greater at Mt. Chilbo than at Imokli showing greater variations among the plots within the surveyed sites for Mt. Chilbo than for Imokli. 2. With three environmental factors examined, there was no difference in the soil moisture contents between the sites, while the average percents of the bare ground was greater Mt. Chilbo than at Imokli, and it was reverse for the ground coverage of pine trees. 3. The overwintering rates of the pine caterpillars at Mt. Chilbo are negatively correlated to tile average bare ground (R=-0.79), which was also Positively correlated to the coverage of the pine trees.(Table 3) 4. The overwintering rates of tile pine caterpillars at Imokli were positively correlated to the coverage of the pine trees. 5. Further analysis of the effects of the environmental factors on the overwintering rates of the pine caterpillars, and there is no environmental factor to be significant in the effect on the overwintering rate for Mt. Chilbo, while the percents of the coverage of the pine tree had significant correlation with the overwintering rate for Imokli.
