火烧迹地落叶松八齿小蠹种群扩散蔓延规律

A Study on the Regularity of Diffusion and Extension of Population of Ips subelongatus Motsch. in the Burned Areas of the Great Xing'an Mountains

1987年大兴安岭发生特大森林火灾,为落叶松八齿小蠹猖獗发生提供了优良的环境条件.经过1988、1989两年的研究,发现落叶松八齿小蠹种群扩散已从重度火烧林转向中、轻度火烧林,每年扩散危害的距离在10m左右;提出扩散蔓延的数学模型为Y=0.67+1.66X,落叶松八齿小蠹扩散蔓延程度与虫源基地中其种群密度和被扩散林分的生理状况有关.其相关数学模型为Y=2.70X+0.25X_2-1.76,落叶松八齿小蠹种群在火烧迹地上扩散属于聚集型扩散.

The regularity of diffusion and extension in Ips subelongatus Motsch.was studied from 1988 to 1989 in the burned areas of the Great Xing'an mountains.A linear relationship between the level of diffusion and extension,and population density in the burned areas,and the physiological conditions in the nearby stands was established.A mathematical model of the diffusion and extension of population of Ips subelongatus in the burned areas was established.