黔西南州烟田生物种群动态与群落结构的研究

The Biological Population Dynamics and Their Community Structure in Tobacco Field in Qianxinan Prefecture,Guizhou

通过对黔西南州烟区常见烟草害虫与天敌种类调查,研究了烟田生物种群动态与群落结构的关系。结果:害虫有27科36种,天敌有10科10种,其中烟蚜、烟青虫、斜纹夜蛾和斑须蝽为主要害虫,烟蚜茧蜂是烟蚜的重要天敌,对控制烟蚜种群增长作用明显;烟田生物群落的多样性指数越大,稳定性指数亦越大。6月下旬到7月中旬田间生物群落的多样性、稳定性指数均为最高,所以此时是抵抗外界干扰能力和恢复原状态的最佳时期,从而提高了对害虫的综合控制作用。

The relationship between the biological population dynamics and community structure was investigated by surveying species of tobacco pests and their natural enemies in tobacco fields in Qianxinan prefecture. The results showed that there were 36 species pests, 27 families and 10 species natural enemies, 10 families. Of which, the aphis, worm, leafworm and stink bug are the main pests to injure tobacco, and Aphidius gifuensis Ashmead is the important natural enemy for obviously controlling increasement of aphis population. The stable index rises with the increasement of diversity index of the biological community and the diversity and stable indexes of the biological community in tobacco fields are the highest from 21, June to 20, July. Therefore, it is the optimum period for resisting outside interference and restoring the original state, which can raises the integrated effect of controlling pests.