摘要
本研究表明，凤阳县玉米田苗期常见有害生物有６科６种，害虫天敌有４科４种，其中麦二叉蚜和黄呆蓟马为主要害虫；龟纹瓢虫是害虫的重要天敌，对控制害虫的种群增长作用明显。其次，生物群落多样性指数越大，稳定性指数亦越大，５月下旬是群落抵抗外界干扰和恢复原状态的最佳时期。通过数学分析得知，麦二叉蚜和黄呆蓟马呈聚集分布时，常见天敌在田间水平分布格局也为聚集分布，从而提高了对害虫的综合控制作用。通过建立黄呆蓟马、龟纹瓢虫种群增长模型，揭示其种群消长与时间变动关系。
The experiment showed that there were six families and six species of Common injurious insects,mainly the Schizaphls grominum and Anaphothrips obscurus (Miiller),and four families and four species of natural enemy of the injurious insects,mainly Propylaea japonica,it plays an important role in controlling the population of injurious insects from increase.Secondly,the bigger the diversity exponent of the biological community ,the higher the stable exponent,and the last tendency period of may was the best period for the community to resist the interfereace from the outside world and to recorer to its original state.It is know by way of mathematical analysis that the injurious insects appear in assemble distribution,So do the natural enemy.
关键词
玉米田
生物种群
群落结构
增长模型
Corn feild Biological population Community structure Increasing model
