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作 者 ：张志勇 刘贤谦 谢映平

期 刊 ：林业科学 1987年 23卷 zj2期 页码：45-53

关键词：青杨；

摘 要 ：本文是作者对青杨天牛的生物学特性充分了解后，用查迹法，编制钴蛀性害虫青杨天牛在3种类型林分内5年的自然种群生命表。用此法取得的生命表数据，经分析得出：(1)该虫在韧皮部取食，一期幼虫阶段死亡率较高，说明此期是该虫生活世代中的薄弱环节，可加强综合防治。(2)影响种群变动的关键因子，高额丰产林为一期幼虫阶段的挤死与二期的啄木鸟啄食；一般丰产林为一期幼虫的失水；小老树林为姬蜂与茵类的寄生。(3)这些关键因子致死力的大小与该虫的种群密度无关。在此基础上建立了该虫的数量预测式。为揭示青杨天牛(Saperda populnea L．)种群数量变动规律，找出影响种群变动的关键因子，为其预测预报和综合防治提供科学依据。

Abstract:A special investigative method in this paper called "trace investigation" was used to make life tables of natural populations of the small poplar borer Saperda papulnea L. in 3 types of forests, for 5 generations(1981-1985) It is time-saving，inexpensive，more precise and less tree-destructive to use this method to get the life tables．Moreover，the calculation is simple and easy．This new method through studying the borer’s biological and ecological characteristics was developed．By analyzing the life tables．Three conclusions could be made：(1)The borer eating the phloem around the twigs(1st period larva) had a higher mortality．Therefore this period was the weak link of its life cycle and the intestated control at this period should be strengthened．(2)The key factors influencing the population’s alternations were： In highly-productive man-made forests it was the squeezing af the first period larva and woodpecker’s pecking of the second period larva; In generally productive man-made forests，It was the desiccation of the first period larva； In low-productive forests，it was the Parasite of several ichneumon wasps and microbial pathogens． Strengthening these factor’s effects was the effective step to control the natural population of Saperda papulnea L．(3)The key factors’lethal ability had no relation to the population’s density． On the above basis the formula of forecast was set． NA=N₁×P_l×P₂×P₃×P₄. NA=Number of adults N₁=Number of total eggs P_l=Ratio of eggs’Stlrcicing． P₂=Ratio of 1St period larvas’surviving．P₃=Ratio of 2th period larvas’surviving． P₄=Ratio of pupas’surviving．The optlmum formula in different forests are： In highly productive forests， lgNA=0.95266·IgN₁P_lP₂P₃+0.506 In general productive forests,lgNA=1.1905·lgN₁P_lP₂P₃-0.398 In low Produetire forests．1gNA=1.1543·lgN₁P_lP₂P₃-0.3385

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