油松受松毛虫危害后恢复能力的研究

油松经人工模拟失去一定的量的１年生针叶后对第２年高生长，针叶长度有明显的影响：失杏越多，影响越大，经２ａ后其后高生长虽仍有差异，但均可恢复到正常生长状态，而失去少量２－３年生针叶后的油松具有有补偿和超补偿效应，失去１年生针叶后油松不具有补偿和超补偿效应。

Study on the Regrowth Ability of Pinus tabulaeformis after Damaging by Pine Caterpillar

Losing a certain number of one year old needles will have a significant effect on the height growth of Pinus tabulaeformis and the length of needles in the following year:the greater the loss,the more serious the effect. After two years,they will return to the normal status although still be different in height growth. If the losing is a small number of two to three year old needle,the pines have compensation and super compensation effect,but if one year old needle,they have not. In the years when the pine caterpillar burst out and 95% of the one to two year old needles are lost,the pines will return to normal status in three years if the site situations are good and they will not if the site situations are poor,for example,a dry southern slope. So,in the control of pine caterpillar,making the widest possibility to reduce the loss of one year old needles is a key to ensure the normal growth of pine trees.