多物种共存系统中拟水狼蛛对三种稻虫的捕食作用

The predatory function of Pirata subparatkus (Boes.et Str.) on three important rice insect pests in a multispecies coexistent system

选择稻田蜘蛛优势种拟水狼蛛(Pirata subparaticus)和水稻主要害虫褐飞虱(Nilaparvata lugens)、白背飞虱(Sogatella furcifera)、黑尾叶蝉(Nephotettix cincticeps)组成多物种共存系统,运用二次通用旋转组合设计试验探讨蜘蛛对稻虫的控制作用,分析天敌与害虫间、害虫之间的相互作用关系,得到天敌对害虫的4个捕食量模型,其中拟水狼蛛对3种害虫的总捕食量模型为Y4=28.143+6.375X1+1.792X2+1.625X3-0.042X4-4.754X21-3.129X22-1.629X23-2.129X24-0.188X1X2+ 0.063X1X3-0.438X1X4-0.188X2X3-0.438X2X4-1.438X3X4.对该模型的主效分析表明,天敌自身密度对捕食量的影响最大;其次是害虫密度的影响,其中褐飞虱对捕食量的影响较大,白背飞虱次之,黑尾叶蝉最小.害虫间的互作分析表明,白背飞虱同黑尾叶蝉间的交互效应对拟水狼蛛捕食作用的影响最强.

By applying common rotational composite design of quadratic regression, the predatory function of Pirata subparaticus (Boes. et Str. ) , a dominant species of spiders in rice field in the suburb of Chongqing City, on three important rice insect pests, namely, the brown planthopper ( BPH) Nilaparvata lugens Stal, whitebacked planthopper (WPH) Sogatella furcifera ( Horvath) and green rice leafhopper (GRLH) Nephotettix cincticeps (Uhler) in a multi-species coexistent system was investigated. Four predation models derived from the analysis of interactions among predator and preys and within preys were developed, in which the total predation model of P. subparaticus on BPH, WPH and GRLH was expressed as follows: Principal effect analysis of this model indicated that among the effects on predation of this spider, the density of predator itself was most important, and the density of insect pests was secondary, in which the effect order was BPH > WPH > GRLH. Analysis of the inter-species effects among the three insect pests on the predation of this spider showed that the action of WPH x GRLH was most powerful.