烟青虫和棉铃虫在烟草上的生态位及其种间竞争

The niche and interspecific competition of oriental tobacco budworm and cotton bollworm in tobacco plants

通过 2 0 0 0～ 2 0 0 1两年的田间调查和室内饲养 ,测定了烟青虫和棉铃虫在烟草上的生态位和种间竞争系数。结果表明 :棉铃虫在烟草上的时间生态位宽度、生态位重叠均大于烟青虫 ,两者的时间生态位相似性比例为 0 .7342 ;两种害虫的空间生态位宽度、生态位重叠很相近 ,生态位相似性比例高达 0 .85 5 9。烟青虫的竞争系数为 0 .312 2 ,棉铃虫的竞争系数为 1.832 0 ,说明棉铃虫的竞争力大于烟青虫。在烟株同一部位两种害种共存率最高仅有 9.30 %。

The niche and interspecific competitive coefficient of oriental tobacco budworm (\%Helicoverpa assutta)\% and cotton bollworm (\%H.armigera)\% were estimated by means of the field investigation and rearing in laboratory during the period of 2000 and 2001. The results showed that the time niche breadth and niche overlap of cotton bollworm are bigger than that of oriental tobacco budworm, the similarity of which in time niche is 0.7342. The space niche breadth and niche overlap of the two pests are very similar, the similarity of space niche of which is 0.8559, and the ratio of coexistence in the same location of tobacco plant is less than 10%. The interspecific competitive coefficient of oriental tobacco budworm is 0.3122, and that of cotton bollworm is 1.8320.