松纵坑切梢小蠹自然种群死亡原因分析

Analysis on Reason for Death of Natural Population of Tomicus piniperda

利用多重降解生命表来分析松纵坑切梢小蠹自然种群的死亡原因，是一种新方法。本文利用云南省昆明地区松纵坑切梢小蠹自然种群生命表的资料，分析其死亡原因。发现该地区松纵坑切梢小蠹自然种群５２．７９％的死亡率出现于卵期、幼虫期和蛹期，分别为１８．０６％、２２．０３％、１２．７０％；特别是幼虫期和卵期死亡率最高，其中３４．８６％的种群死亡为捕食性天敌所致。其捕食率分别为１２．６４％和１２．５８％，因此，认为捕食是幼虫期及卵期控制种群数量的关键因子之一。对该害虫进行综合防治时，应重点加强对捕食性天敌的保护和利用。

It is a new method to analyze the reason for death of natural population of Tomicus piniperda by using the data in natural population life table of Tomicus piniperda in Kunming district, through the analysis, it has been found that the death rate of natural population of Tomicus piniperda occurred in 3 different periods, that is egg, larva and pupa period, and the death rate are 18.06%, 22.03% and 12.70% respectively, the death rate of larva and egg periods are very high, 34.86% of death population are caused by the natural enemy predator, the predation rate of egg period and larva period are 12.64% and 12.58% respectively. It showed that predation is one of the key factors to control the population quantity in larva and egg period, for obtain the purpose of integrated control, the work of the protection and utilization of the enemy predator should be enhanced.