云杉小黑天牛在火烧迹地扩散蔓延的规律

Study on the Regularity of Diffusion and Extension of Monochamus sutor L. in the Burned Areas of the Great Xing'an Mountains

云杉小黑天牛(Monochamus sutor L.)在大兴安蛉火烧迹地上扩散蔓延的范围、程度,主要受地上此虫种群数最的大小、周围林分的生理状况等因素的影响。云杉小黑天牛具有很强的耐饥能力。最大飞行距离至少为900m,可扩散寻找适宜的寄主。1989年,云杉小黑天牛基本上不再侵染重度火烧林,主要向轻度、中度火烧林扩散蔓延。目前尚未向未过火林扩散。

The levels of diffusion and extension of Monochamus sutor L.,which infests the burned areas of the Great Xing'an Mountains,are influenced by the insect population and the condition of the nearby stands.Also,this paper states a mathematical model of diffusion and extension for Monochamus sutor L.in the burned areas.