油松毛虫危害油松的动态经济阈值的研究

本文以油松林-油松毛虫生态系统为研究对象,采用系统分析的方法,组建了油松生长动态子模型,油松毛虫幼虫种群动态子模型和油松毛虫危害油松的动态子模型.并将它们耦联在一起,形成了动态经济阈值模型.模拟结果表明:当油松密度相同时,油松针叶量越大,则经济阈值也越大;当油松针叶量相同时,油松密度越高,则经济阈值越小;当使用的药剂费用越低,杀虫效果越高时,则经济阈值越小.

Studies on Dynamic Economic Threshold of Chinese Pine Forests Damaged by Chinese Pine Caterpillar

Based on the study of the ecosystem of Chinese pine-Chinese pine caterpillar (Dendrolimus tabulaeformis), three dynamic sub-models were made. Chinese pine sub-model, Chinese pine caterpillar sub-model and the damaging sub-model, by means of system analysis method. Then the model of dynamic economic threshold was built. The results of this simulation are as follows. ( 1 ) Under the same Chinese pine density, the greater the needle weight is, the greater the economic threshold, ( 2 ) Under the same needle weight, the higher the Chinese pine density is, the less the economic threshold; ( 3 ) Under the demand of small controlling cost, the higher the efficiency of control, the less the economic threshold, conversely, the higher economic threshold.