稻田节肢动物群落的多样性及对褐飞虱的控制功能

对江苏江浦及安徽安庆两地五种类型稻田的节肢动物群落生物多样性研究表明,以对褐飞虱Nilaparvata lugens具有抗性的粳稻田多样性指数最高。稻田蜘蛛亚群落与褐飞虱种群数量变化间存在明显的相关性,11年中64%的年份表现为显著相关。利用天敌功能指数EF=（E+P）^E/P、数值反应的方法研究了稻田蜘蛛功能团与褐飞虱种群间的生存、繁殖和数量关系,结果表明,初始EF值与褐飞虱对水稻的危害率及褐飞虱种群的未来最大饱和容量K值间呈显著相关。本文讨论了利用初始EF值来预测天敌对害虫的功能作用及生物防治与化学防治协调的可能性。

The diversity of .arthropod community and control function to brown planthopper(BPH) in rice field

The diversity of arthropod community in five types of paddy were studied in Jiangpu, Jiangsu Province and Anqing, Anhui Province. The results showed that the diversity was the highest in the round grained rice field. The correlation frequency in 11 years between population density of spider sub-community and the brown planthopper (BPH), Nilaparvata lugens was 0.64. The EF index ［EF=(E+P)^E/P］ was employed to evaluate the nature enemy function to control the brown planthopper. The relations of spider functional group with growth, reproduction and population density of brown planthopper were investigated by numerical functional response method. The relations of the initial EF value with the injured rate of rice and the carrying capacity of logistic curve of the brown planthopper population (K) were significant. The possibility of using the initial EF value to predict the enemy function and to coordinate the pest control strategies with natural enemies and with chemical insecticides was discussed.