稻田三种捕食性天敌与两种害虫共存系统捕食量的研究

Predatory Capacity in Coexistent System of Three Predatory Natural Enemies and Two Insect Pests in Paddy Field.

有关捕食者-猎物关系的研究一直是种群生态学的活跃课题。Lotka-Volterra(1925)方程是最早用于研究捕食者-猎物系统的数学模型。此后许多作者进一步研究了捕食者-猎物(寄主-寄生物)的关系(Nicholson和Bailey,1935;Holling,1959;Hassell和Varley,1989;Murdoch,1969;Manley等,1972;李超等,1982,1983;丁岩钦等,1983;

The method of rotational composite design of quadratic regression is used to establish mathematical models of predatory capacity in the coexistent system of three predatory natural enemies and two insect pests in paddy field. Under the system, predators prey mainly on white-backed rice planthopper.When coexist with 4th instar larva of white-backed rice planthopper and 3rd instar larva of rice leafroller, they also prey to a certain amount on the latter, the predation sequence is Paederus fuscipes>Pirata subpiruticus>Oedothorax insecticeps. Increase of the density of planthopper significantly reduces the predation on larva of rice leafroller, but increase of the density of the latter has little influence on the amount of planthopper being preyed.