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在用整个试验期间的气温确定各虫态历期的方法进行小菜蛾Plutella xylostella(L.)生命表数据分析时,所计算出来的未防治田某些虫态的存活率有大于1的不正常现象。为此,提出了一种新的分析方法。首先,将每次调查到的各虫态的数量(Nis)都用公式进行如下计算:每个虫态的期中值Nim=(Nis·D)/Ti;每个虫态的初始值Nib=(Ti-1·Nim+Ti·N(i-1)m/(Ti+Ti-1)。公式中,每个虫态的历期(Ti)是以每次调查期间的气温,而不是整个试验期间的气温确定的。然后,将每个虫态的初始值进行累加用以求出各个虫态的存活率。其余方法与原方法相同。用9个生命表的调查数据进行了测试,并与原方法进行了比较。对其意义和问题也进行了讨论。
In the life-table data analysis of the Plutella xylostella (L.) Plutella xylostella (L.) Using the method of determining the duration of each stage of insects by the temperature during the whole experiment period, the calculated survival rate of some insect states in the non-control field was more than 1 phenomenon. To this end, a new analysis method is proposed. First of all, the number of each insect state (Nis) in each survey was calculated as follows: Median Nim = (Nis · D) / Ti per insect state; Initial value of each insect state Nib = ( Ti-1 · Nim + Ti · N (i-1) m / (Ti + Ti- 1) In the formula, the duration of each worm state (Ti) is calculated based on the temperature during each survey instead of the entire experiment The temperature during the period was then determined, and then the initial value of each insect state was summed to find the survival rate of each worm state.The rest of the method was the same as the original method, and was tested with the nine life table survey data, The original method is compared, and its meaning and problems are also discussed.