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越冬代松毛虫的严重危害 (针叶损失 70 %以上 ) ,对当年的高生长量、胸径生长量和材积生长量有极显著影响 ;一代 (7月 )的严重危害 ,对当年和后一年的胸径生长量、材积生长量有显著影响 ,对高生长影响不显著 ;二代 (9月 )的严重危害 ,对当年的生长量无影响 ,对后一年的高生长量、胸径生长量和材积生长量有极显著影响。无论哪一代危害 ,对后 2年的生长量无影响
The serious damage of overwintering Dendrolimus punctatus (coniferous loss more than 70%) had a very significant impact on the high growth, the DBH growth and the volume growth of the year. The serious harm of the first generation (July) The DBH growth and the volume growth had a significant effect on the growth but the impact on the growth was insignificant. The serious harm of the second generation (September) had no effect on the growth of the year, but the growth of DBH, Volume growth has a very significant impact. No matter what generation of harm, the growth of the latter two years no effect