摘要
1998年在河南安阳植棉区对麦套春棉和平作春棉两种类型棉田二、三代棉铃虫自然种群进行了系统观测 ,并组建了相应的生命表。麦套春棉和平作春棉二代棉铃虫世代存活率分别为0 .0 92 %和 0 .1 0 5% ,均低于相应的三代 (分别为0 .465%和 0 .450 % )。麦套春棉和平作春棉二代棉铃虫自然种群趋势指数 I分别为 0 .2 946和0 .3376,均低于相应的三代 (分别为 2 .91 2 3和2 .831 8)。麦套春棉二代棉铃虫世代存活率和种群趋势指数均低于同代的平作春棉 ,而麦套春棉三代棉铃虫世代存活率和种群趋势指数则高于同代的平作春棉。天敌捕食和气候因子是影响两类棉田二、三代棉铃虫自然种群数量变动的关键因素。麦套春棉二代棉铃虫发生期 ,捕食性天敌发生量较大 ,棉铃虫自然种群数量较平作春棉减少幅度大 ;平作春棉三代棉铃虫发生期 。
The life tables of cotton bollworm (Helicoverpa armigera Hübner) in cotton wheat intercropping and single cotton were established at Anyang, Henan in 1998. The survival rates of the second generation in the intercropped and single cotton fields were 0.092% and 0.105%, respectively, which was much lower than those in the third generation ( 0.465% and 0.450%, respectively). The trend indices (I) of population increase for the second generation in the intercropped and single cotton fields were 0.2946 and 0.3376, respectively, which was much less than those in the third generation. Both survival rate of the second generation and its trend index (I) for population increase in the intercropped field were lower than those in the single cotton field, while for the third generation they were all higher in the intercropped field than in the single cotton field. Predation and weather were the key factors affecting the dynamics of the bollworm populations of both generations in both cropping systems. The abundance of predators during the period of the second bollworm generation in the intercropped field was much greater than in the single cotton field, with the number of the pest populations greatly decreased in the intercropped field, while in the intercopped field, the number of the bollworm populations for the third generation was relatively higher than that in the single cotton.
出处
《棉花学报》
CSCD
北大核心
2000年第6期281-287,共7页
Cotton Science
基金
国家攀登计划资助项目
关键词
套作
纯作
棉花
种群动态
棉铃虫
生命表
cotton wheat intercropping
single cotton cropping
Helicoverpa armigera
population dynamics
life tabl0
