摘要
通过对以河北饶阳为代表的华北棉区棉铃虫动态的研究 ,建立了各代棉铃虫自然种群生命表 .结果表明 ,华北棉区第 1～ 4代棉铃虫总死亡率分别为 98.3 %、98.3 4%、98.69%和 99.13 % ,各代棉铃虫种群的趋势指数I值分别为 3 .97、1.5 0、1.41和 1.0 9.与以江苏南通为代表的南方棉区生命表参数相比较发现 ,无论是在南方还是在北方 ,棉铃虫的存活率曲线都属于A型曲线 ,即卵至 2龄期死亡率较大 ,3龄以后死亡率较小的下凹型曲线 .南方棉区棉铃虫消亡的关键因子是风雨冲刷作用 ,而北方则是天敌的捕食作用 ;南北棉区的棉铃虫孵化期和 1龄期 ,易受不良环境的影响 ,死亡率较大 ,为关键虫期 ;北方棉区主要危害世代是 2、3代棉铃虫 ,南方棉区为 3、4代棉铃虫 .
The population dynamics of Helicoverpa armigera in Raoyang County, Hebei Province as an example in Northern China was researched, and its natural life table was established.The results showed that total mortality of first to fourth generations of cotton bollworm in Northern China were 98.3%, 98.34%, 98.69% and 99.13 %, and the population tendency index (I) were 3.97, 1.50, 1.41 and 1.09, respectively.A comparative analysis of the natural life table of cotton bollworm in Southern China and in Northern China showed that the survival curves were concave curves in the two cotton zones. The curve showed that the mortality of cotton bollworm was higher in its egg stage to the second instar, and lower after the third instar. The key death factor of cotton bollworm was the scouring effect of rain and wind in Southern China, and the predation of its natural enemies in Northern China. The hatch period to the first instar was the key stage in Northern China and Southern China, and in this time, its larva instar was slim, fragile and sensitive to bad circumstances, so its mortality was higher. The second and third generations were the key damage generations in Northern China, while the third and fourth generations were the key damage generations in Southern China. The development and damage characters of each generation in Northern China and in Southern China were discussed.
出处
《应用生态学报》
CAS
CSCD
2003年第2期241-245,共5页
Chinese Journal of Applied Ecology
基金
中国科学院知识创新工程重要方向项目 (KSCX2 2 0 2 )
国家自然科学基金项目 (39970 137)
国家重点基础研究发展规划资助项目(G2 0 0 0 0 162 0 9)
