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众所周知,原始森林或绝对自然保护区,一般都不存在害虫猖獗的问题。这是由于害虫与天敌相互制约、彼此数量都保持在一个比较低的水平,得以维持在一个相对稳定、相对平衡状态。这种现象我们称之为“自然相对平衡现象”。森林的自然生态体系相对平衡的环境,若突然遭到破环,则全部或部分天敌因子就会失去制约其寄主害虫的作用,再加上气候等环境生态条件,有利于害虫的繁殖,则该处害虫便猖獗起来。特别是人工林,实际上它是按照人类的要求而构成的人工生态系,这不仪降低了森林内动、植物区系的复杂性,还集中和扩大了某些昆虫的食料来源,因而,无法坐待群落间
As we all know, there are generally no pests that are rampant in virgin forests or absolute nature reserves. This is due to the mutual restraint between pests and natural enemies, each of which is maintained at a relatively low level and maintained in a relatively stable and relatively balanced state. We call this phenomenon “natural relative balance phenomenon.” If the environment with relative balance of natural ecosystem in the forest is destroyed suddenly, all or part of the natural enemies will lose the role of restricting their host pests. Coupled with the environmental and ecological conditions such as climate, it is good for the propagation of pests Department of pests will rampant. Artificial forests, in particular, are man-made ecosystems constructed according to human requirements. This not only reduces the complexity of fauna and flora in forests, but also concentrates and expands the food sources of certain insects. Therefore, Can not sit in the community