吡虫啉对烟田节肢动物群落的影响研究

Effects of imidacloprid on arthropod community structure in tobacco field

利用群落参数分析了吡虫啉对烟田节肢动物群落及其各亚群落的影响 .结果表明 ,施药后对烟田节肢动物群落、害虫亚群落的物种数有一定的影响 ,对天敌昆虫和蜘蛛亚群落物种数的影响不明显 .5月2 3日施药后至 6月 13日施药区 (Ⅱ )和对照区节肢动物群落、害虫亚群落个体数均下降 ,下降程度施药区大于对照区 .6月 14日施药后施药区节肢动物群落、害虫亚群落个体数下降 ,对照区显著上升 .两次施药对天敌昆虫和蜘蛛亚群落个体数的影响不明显 .施药后一段时间内优势种烟蚜种群个体数量显著下降 ,使节肢动物群落和害虫亚群落优势集中性下降 ,多样性指数和稳定性增加 .

The effects of imidacloprid on the structure of arthropod community and its sub-communities were analyzed. The results showed that after applied imidacloprid, the species number of arthropod community and its pest sub-community was influenced, but that of its natural insect enemy and spider sub-community was not influenced obviously. The individuals of arthropod community and its pest sub-community in both treatment plot (Ⅱ) abstract and control plot were decreased after the application of imidacloprid on May 23 to June 13, and the decline degree in treatment plot was larger than that in control plot. The individuals of arthropod community and its pest sub-community at treatment plots had a large decrease, and that in control plot had a large increase after imidacloprid application on June 14. Twice applications with imidacloprid did not reduce the number of the individuals of natural insect enemy and spider sub-community obviously. The individuals of tobacco aphids who were dominant in tobacco field decreased obviously within a period of time after application, and hence, the dominant concentration of arthropod community and its pest sub-community declined, and the diversity and stability increased.