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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 interspecies competition coefficients of tobacco budworm and cotton bollworm on tobacco were determined by two years of field survey and indoor feeding from 2000 to 2001. The results showed that the niche breadth and niche overlap of tobacco bollworm were greater than that of tobacco budworm, and the ratio of niche breadth to niche breadth of tobacco bollworm was 0.7342. The spatial niche breadth and niche overlap of tobacco bollworm were similar , The niche similarity ratio is as high as 0.85 5 9. The competition coefficient of tobacco budworm was 0.3212, the competition coefficient of cotton bollworm was 1.832 0, indicating that the competitiveness of cotton bollworm was greater than that of tobacco budworm. In the same part of tobacco plant two kinds of harmful species coexistence rate is the highest only 9.30%.