油桐尺蠖危害对桉树生物量和木材材积的影响

Effects of Buzura suppressaria Guenee on Losses of Eucalyptus Biomass and Wood Volumes

为了解桉树遭受油桐尺蠖危害对桉树生物量和木材材积造成的损失情况,通过调查,测定受油桐尺蠖危害的林分相关情况,运用数学模型对虫害损失科学评估。结果表明：桉树遭受虫害后对桉树生物量和木材材积造成的损失十分明显,特别是受害程度达中、重度的2-3年生桉树单株生物量和立木材积有较大的损失,生物量和材积损失率分别达21.62%-51.83%和36.23%-75.17%。建议生产上,当桉树油桐尺蠖虫口密度达到6条/标准枝（50 cm）以上要采取有效防治措施,压缩虫口密度,防止其对林木造成更大的损失。

In order to understand the biomass and wood volume losses of Eucalyptus suffered by Buzura suppressaria, we had surveyed the victim’s stand and used the mathematical model to carry out the disaster losses. Results showed that the losses of eucalyptus biomass and wood volume were very obvious, especially for the moderate and severe injured eucalyptus, the biomass loss rate and volume loss rate reached 21.62%-51.83%and 36.23%-75.17%, respectively. In the production, when the pest density reached 6 insects per standard branch （50 cm） or more, chemical control measures should be taken to reduce the population density to avoid causing bigger loss.