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一生态平衡是指在一定时间内生态系统中生物和环境之间相互依赖、相互制约、维持某种协调,使能量流动和物质循环保持相对的稳定状态。但在这个动态平衡的整体中,任何一个组成部分的变动,都会直接的、间接的、暂时的或长久的影响着整个生态系统的稳定,甚至破坏生态平衡。在农作物病虫害的防治上,自四十年代有机氯农药(六六六、滴滴涕等)及含汞、砷等制剂出现以来,使用化学农药防治农作物病虫害受到了普遍的重视,并在提高农作
An ecological balance refers to the ecological environment in a certain period of interdependence between organisms and the environment, mutual restraint, to maintain some coordination, so that energy flows and material cycles remain relatively stable. However, the changes in any one component of this dynamic balance will directly, indirectly, temporarily or permanently affect the stability of the entire ecosystem and even undermine the ecological balance. In crop pest prevention and control, since the advent of organochlorine pesticides (such as BHC and DDT) and preparations containing mercury and arsenic in the 1940s, the use of chemical pesticides to control crop pests and diseases has received widespread attention.