Abstract: Farmland landscape pattern shaped by agricultural intensification affects the formation, maintenance and pest-control function of bird and insect natural enemy diversity. Effects of landscape habitats on birds and insect natural enemies and maize aphid populations were analyzed in five different habitats. The results showed that the populations of ladybird (Propylaea Japonica) and lacewing (Chrysopa perla) were the largest in farmland landscape with 20% of non-maize fields, while ladybird (Harmonia axyridis) was the largest in farmland landscape with 30% of non-maize habitats. The farmland landscape with 15%, 20%, 30% and 40% non-maize habitat were conducive to the conservation of Chinese bulbul (Pycnonotus sinensis) and turtle dove (Streptopelia turtur), sparrows (Passer montanus), magpie (Pica pica) and house swallow (Hirundo rustica), and hoopoe (Upupa epops), respectively. The cumulative quantity of maize aphid was the lowest in the farmland landscape with 30% of non-maize habitats. The results of exclusion of birds and natural enemies showed that they had significant control on maize aphid. The farmland landscape with 20% non-maize habitat can conserve more natural enemies and reduce maize aphid, and improve the biological control service of farmland landscape on maize pests.

Key words: birds, natural enemies, maize aphids, farmland landscape habitat, food web, biological control