两种杀虫剂对稻田捕食性天敌集团捕食功能的影响

将稻田各类捕食性天敌作为一集团，运用功能法评价了甲胺磷和杀虫双对该集团捕食功能的影响，由于各类捕食性天敌对杀虫剂敏感性的不同，甲胺磷和杀虫双造成的各类天敌的死亡率和残存天敌个体的捕食功能减退率均不同。实验表明，隐翅虫类和狼蛛类对甲胺磷较为敏感，而对杀虫双，肖蛸类最为敏感。杀虫双对隐翅虫类的致死作用及捕食功能影响较小。就集团的捕食功能而言，甲胺磷影响明显大于杀虫双，但在总的功能减退率组分中，甲胺磷致

The effects of two insecticides on predation function of predatory natural enemies

The effects of Methamidophos and Shachongshuang on the predation function of natural enemygroup were evaluated with function method Owing to the different susceptibilities of predatory natural enemies to insecticides,the mortalities and decreasing rates of predation function(FD) of surviving natural enemies were different As to the whole predation function of the predatory group,Methamidophos had more serious effects than Shachongshuang in a short time But in Methamidophos treatment,the lethalities were larger than the effects on predation function of surviving natural enemies on the contrary with the Shachongshuang treatment Experiments also demonstrated that the effect of Shachongshuang lasted longer and the recovery of predation function of affected natural enemies were slower