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虫害和林火是森林生态系统的两种主要干扰类型,各种干扰在大时空尺度上存在一定的交互作用.本文采用空间直观景观模型LANDIS模拟虫害和林火在300年内的交互作用.结果表明:虫害干扰降低了细可燃物载量,提高了模拟前期(0～100 a)和中期(100～200 a)的粗可燃物载量,降低了模拟前期和中期的林火频率,不同干扰预案模拟后期(200～300 a)火烧频率的结果比较接近;虫害干扰降低了模拟前期和后期的火烧强度,增加了模拟中期的火烧强度,提高了模拟中期的森林火险等级,降低了模拟前期和后期的火险等级.人类灭火可增加虫害的发生面积,因此建议森林管理部门采取适当的防虫措施,不可只注重灭火,可以采取可燃物去除和计划火烧等方式管理林火,促进森林生态系统的可持续发展.
Insect pests and forest fires are the two major types of disturbance in forest ecosystems, and all kinds of interference have some interactions on large temporal and spatial scales.In this paper, LANDIS was used to simulate the interaction between pests and forest fire in 300 years.The results showed : The pest disturbance reduced the fine combustible loading, increased the crude combustible loading in the pre-simulation (0 ~ 100 a) and the medium-term (100 ~ 200 a), reduced the forest fire frequency in the early and mid-term simulations, The results of fire frequency in the late stage of simulation (200-300 a) were relatively close. The pest disturbance reduced the fire intensity in the early and late stages of simulation, increased the fire intensity in the mid-simulation period, increased the forest fire hazard level in the mid-simulation stage and reduced the pre- and post-simulation period Of the fire risk level.Human fire extinguishing can increase the area of occurrence of pests, it is recommended that the forest management department take appropriate pest control measures, not only focus on fire fighting, can take combustible removal and plan fire and other ways to manage forest fire and promote the sustainable development of forest ecosystem development of.