摘要
该文研究了 3种林分类型樗蚕 Philosamia cynthia自然种群动态。结果表明 :樗蚕世代内种群数量呈不断减少趋势 ;在各虫期中 ,1～ 2龄幼虫存活率最低 ,卵期存活率最高 ;不同世代间 ,第 1代存活率高于第 2代 ;在不同林分类型中枣粮间作存活率最低 ,而臭椿片林最高。在不同世代间各虫期的死亡原因和死亡率及变异程度有所不同 ,在不同年度间以蛹期死亡率变异最大 ;
The result of the survey in three types of stands showed that the population density of Philosamia cynthia decreased gradually in the generation.Among all stages,the survival rate of larvae in the first and second instars is the lowest while that of eggs is the highest.Among generations the survival rate of the first generation is higher than that of the second generation.Among different types of stands,the survival rate of Philosamia cynthia is highest in Ailanthus altissima stands and lowest in alternations of jujuba and crops.
出处
《森林病虫通讯》
北大核心
2000年第6期20-22,共3页
Forest Pest and Disease
关键词
林分类型
樗蚕
种群动态
stand types
Philosamia cynthia
population dynamics
