草原毛虫种群动态及其成灾原因研究

Population Dynamics and Outbreak Reason of Grassland Caterpillar

草原毛虫给高寒草原带来很严重的危害。草原毛虫本身能依食物供给进行种群调节。放牧等因素使草的生物量减少,天敌等因素使草原毛虫的数量减少,据此建立了草和草原毛虫的动态模型。通过分析得到草原毛虫天敌数量的减少很可能是其数量激增的原因。

The grassland caterpillar brings alpine grassland serious damage Grassland caterpillar can regu- late the population size by itself according to food supply. Grazing reduces the biomass of vegetation and natural enemies reduce the amount of grassland caterpillar. Based all these factors, dynamic model of grass and grass- land caterpillar was formulated. The theoretical analysis showed that the decreasing of natural enemies may be the reason of grassland caterpillar increasing.