Effect of chemical insecticides on the diversity of arthropods in vegetable fields
化学杀虫剂对菜田节肢动物多样性的影响

The effect of chemical insecticides on the structure and diversity of arthropods in various vegetable fields were studied. The results showed that the effect of chemical insecticides on the arthropods in vegetable fields was reflected from the species structure, the diversity index and the distributive evenness of species. Components of arthropod species fluctuated closely with the insect pests, predatory natural enemies and spiders. Without chemical insecticides in vegetable fields, the index of population trend (I) of dominant insect pest decreased greatly, the control effect of natural enemies on major insect pests increased, the diversity index of arthropod increased at the same time. Thus, limited use of chemical insecticides, resumed the environment of vegetable fields destroyed by application of chemical insecticides, escalation of the control ability of natural enemies to main insect pest would play an important role in the ecological control of insect pests in vegetable fields.