稻型、生育期及防治措施对害虫和天敌群落的复合效应

Multi-effects of rice types,development stages and insecticide treatments on insect pest and natural enemy communities

通过对不同稻型、水稻生育期及防治措施29个群落的田间系统调查,运用极点排序法和模糊聚类法进行群落分析。结果表明,对稻田害虫和天敌群落的影响,总体上防治措施>稻型>生育期,不同稻型和水稻生育期害虫和天敌自身的特点,对不同防治措施对群落作用的效果有重要影响;早稻分蘖期和中稻分蘖期节肢动物群落具备自我调节能力,中稻乳熟期群落稳定性极差,需要人为防治措施,晚稻田群落稳定性较高。试验结果对群落生态学的研究与指导生产具有重要的理论和实践意义。

Based on systematic investigation of 29 communities under different rice types,different de-velopment stages and different pesticide treatments,polar ordination method and fuzzy clustering method were used to analyze community characteristics.The results show as follows.The overall influence order of different factors on insect pest and natural enemy communities was insecticide treatmentrice typedevelopment pe-riod,but the characteristics of insect pest and natural enemy communities of different rice types and develop-ment periods had important effects on the results of the influence of different insecticide treatments on the communities;the arthropod communities had self-regulation in tillering stage of early rice and middle-season rice.Artificial control measures was necessary in milking stage of middle-season rice because of the poor community stability,but the general characteristics of the communities were relatively stable in late paddy fields.The results provided important theoretical and practical significance for community ecology research and guiding production.