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Effects of nitrogenous fertilization in rice fields on the predatory function of Cyrtorhinus lividipennis Reuter to Nilaparvata lugens St(a)l
Author(s): 
Pages: 48-56
Year: Issue:  1
Journal: ACTA ENTOMOLOGICA SINICA

Keyword:  黑肩绿盲蝽褐飞虱水稻氮肥捕食功能;
Abstract: 在实验室条件下研究了黑肩绿盲蝽Cyrtorhinus lividipennis Reuter在不同含氮量稻株上对褐飞虱Nilaparvata lugens Stal卵和低龄若虫的捕食能力、对褐飞虱卵的捕食功能反应以及褐飞虱蜜露和水稻伤流液对其捕食能力的影响.结果表明,黑肩绿盲蝽对褐飞虱卵和若虫的捕食量均与寄主植物的含氮量呈显著负相关.黑肩绿盲蝽在相同氮肥施用量的稻株上连续饲养2代后对褐飞虱卵的捕食能力没有改变.黑肩绿盲蝽对褐飞虱卵的功能反应呈HollingⅡ型方程,其参数瞬时发现率(a)和处置时间(Th)只与寄主含氮量有关,而与黑肩绿盲蝽种群和褐飞虱卵的来源无关.在高氮量稻株上黑肩绿盲蝽种群对褐飞虱卵的瞬时发现率(a)下降导致了功能反应的减弱,而在相同含氮量稻株上黑肩绿盲蝽种群之间的捕食功能没有明显差异.黑肩绿盲蝽成虫取食水稻伤流液和褐飞虱蜜露时寿命明显延长,取食高氮稻株的褐飞虱分泌的蜜露对延长黑肩绿盲蝽雌成虫寿命的作用最大.但是,在高氮稻株上褐飞虱蜜露显著降低黑肩绿盲蝽的捕食能力.这些结果表明黑肩绿盲蝽对褐飞虱自然控制作用的下降是稻田过量施用氮肥后褐飞虱种群增加的主要原因之一.
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