关键词: 施氮量, 无机氮, 根际, 土壤酶活性

Abstract: An investigation was conducted on arthropod community in summer maize fields with different planting environments in Puer, Yunnan Province. The community characteristic index, community stability and principal component analysis were applied to analyze the arthropod community in summer maize fields with different planting environments. The results showed that a total of 10174 arthropod individuals were collected, which belonged to 2 classes, 15 orders, 100 families, and 261 species. In summer maize field with monoculture planting environment, 5604 arthropod individuals were found, belonging to 2 classes, 13 orders, 84 families and 168 species. In summer maize field with mixed planting environment, 4570 arthropod individuals belonging to 2 classes 15 orders 90 families and 209 species were found. Compared with summer maize field with monoculture planting environment, the number of species, diversity, evenness, abundance index of arthropod community, the number of species and individuals of natural enemies in summer maize field with mixed planting environment were higher, while the individuals and proportion of phytophagous insects, the dominant concentration index and dominance index were lower. In summer maize field with mixed planting environment, the community was more stable, and diversity, evenness and richness index of community had smaller fluctuation with time. In summer maize field with monoculture planting environment, the individual number of piercing sucking insects and species number of leaffeeding insects were the dominant factors affecting arthropod community, while in summer maize field with mixed planting environment, the individual number of parasitic insects, species number of predatory insects and the individual number of piercing sucking insects were the dominant factors determining the change of arthropod community.

Key words: rhizosphere, nitrogen application rate, soil enzyme activities, inorganic nitrogen.