淹灌和间歇灌溉对晚稻田节肢动物群落多样性影响

In order to reveal the impact of water-saving irrigation on paddy arthropod pests and natural enemy community diversity, we compared paddy arthropod community diversity under two kinds of different management models, flooding irrigation and intermittent irrigation, using the methods of community ecology. The results showed that intermittent irrigation increased the species of arthropod community in each growth period of rice, effectively raising the species and the number of natural enemies. In the whole growth period, the species was increased by 24.4% and the number was increased by 26.2% on average. When to the jointing Booting Stage, species and the number came up to the highest rate of increasing. Species was 125.0% higher than flooding irrigation, the amount was 50.0% higher too. Intermittent irrigation effectively improved community diversity of natural enemies, reducing pest diversity D, H', S and E of pest and natural enemies were affected smaller by the environmental fluctuation under intermittent irrigation pattern. Fluctuation of each diversity index is consistent, keeping predators and pests community distribution of stability. Water-saving irrigation was readily available for the realization of effective ecological control of paddy pests.