【摘要】 对元谋县德昌松毛虫空间分布型和生命表的研究结果表明 :德昌松毛虫在林内呈聚集分布 ,该虫种群的聚集由昆虫行为引起 ,得出最适抽样株数换算式 :N =2 81 4/ x + 4 8 4;寄生蝇和寄生蜂是元谋县德昌松毛虫种群变动的关键因子 ,除第 1代 1 ,2龄幼虫期自然死亡外 ,蛹期是寄生蝇和寄生蜂寄生死亡率最高时期 .更多还原

【Abstract】 The study on the spatial distribution pattern and life table on Dendrolimus punctatus tehchangensis indicates that the distribution in forest stand is in the form of congregation that results from their behavior.The most suitable number of sample trees is as follows:N=281.4/+48.4.The parasite bees and flies are the major affecting factors.The prime death appears in pupa caused by the above two factors except for the natural death in the first and the second instar larva of the first generation.ctatustehchangen更多还原