云南油杉与油杉吉松叶蜂两种群的相关性研究

在油杉吉松叶蜂(Gilpiniadisa)虫害常发区设标准地，通过观测云南油杉(Keteleeriaevelyniana)受害植株的生长情况，寄主植物食源量对幼虫发育的影响，以探索两种群之间的相关性。其结果表明云南油杉从食源上制约着油杉吉松叶蜂幼虫的发育，当油杉吉松叶蜂4龄幼虫在食源紧缺时(寄主失叶量≥5/6)，仅有2．5％的能正常发育；当云南油杉失叶量小于1/3时，其高、径、材积呈增效生长；云南油杉具有极强的抗虫性，当它连续3年(每年失叶1次)严重受害失叶后，仍能存活，但如果1年内连续两次严重受害失叶后，植株就会死亡；云南油杉受害失叶量≥1/3时，其高、径生长量、材积生长率随着受害程度增强而减小。

Study on the Correlation of Populations of Keteleeria evelyniana Mast and Gilpinia disa Smith

Sample plots were set in areas of Gilpinia disa occurring frequently.? The correlation of Keteleeria evelyniana and Gilpinia disa was studies through observing growth state of Keteleeria evelyniana and the influence of food resource amount of host on development of larva of Gilpinia disa.? The results show that the development of the larva is restricted by food resource amount.? When 4 age of Gilpinia disa are lack of food resource, only 2 5% of them can survive.? When the leaves lose of Keteleeria evelyniana is less than one third, their height, diameter and volume will increase positively.? Keteleeria evelyniana has very strong pest resistance, which can still survive even when suffering pest damage for 3 years continuously (losing leaves one time per year).? However, they will die when suffering the damage and losing leaves 2 times within one year.? The height, diameter growth and the rate of stem volume growth of Keteleeria evelyniana will decrease with the increase of suffering degree when the amount of losing leaves is more or equal to one third.?