摘要
通过调查洪雅林场不同年龄柳杉林赤腹松鼠危害情况,测量各年龄段被害木与健康木的生长差异,计算出单株材积损失率,用回归拟合危害程度与单株材积损失率的关系,计算当地柳杉经济允许损失水平和防治指标。结果表明：材积损失率与危害等级均成正相关。赤腹松鼠危害造成的材积损失率随着树龄略有差异,10~12年、13~15年生柳杉林的经济允许材积损失率分别为2.411%和2.742%,对应的新危害指数（∑（各危害级株数×危害等级）/（调查株数×危害最高级）×100%）为2.42和2.92。
By surveying the damages caused by red-bellied squirrel Callosciurus erythraeus on Cryptomeria fortunei of dif- ferent ages, comparing the volume losses between the damaged and non-damaged trees, calculating the volume losses and e- conomic threshold according to the cost of control, this study showed that there was positive correlation between the rate of volume losses and the damage grades. Rate of volume losses caused by red-bellied squirrels were different with the ages of the forests. The economic injury losses of Cryptomeriafortunei forests aging from 10 to 12 years and from 13 to 15 years were 2.42 and 2.92, respectively, and individual value rates of losses were 2.411% and 2. 742%, respectively.
出处
《四川动物》
北大核心
2015年第1期88-92,98,共6页
Sichuan Journal of Zoology
基金
"十二五"农村领域国家科技计划课题:林区鼠害防控技术研发与应用(No.2012BAD19B00)
四川省林业厅森林病虫检疫总站"赤腹松鼠防治指标研究"项目
关键词
赤腹松鼠
危害
防治指标
洪雅县
Callosciurus erythraeus
damage
economic threshold
Hongya county
