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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.
Large forest fires occurred in Daxinganling in 1987, which provided excellent environmental conditions for rampant occurrence of Larix principis-rupprechtii. After two years of research in 1988 and 1989, it was found that the spread of Larix gmelinii population had shifted from severe fire- Light fire forest, the annual diffusion hazards of the distance of about 10m; Proposed diffusion spread of the mathematical model Y = 0.67 + 1.66X, Larix principis-rupprechtii spread and spread its population density and population base in the area was spread Of the physiological conditions related to its mathematical model Y = 2.70X + 0.25X_2-1.76, Larix gmelini population spread in the fire on the site of the accumulation of diffusion.