Effects of regional agricultural landscape pattern on the community of ladybeetles in wheat fields
ZHANG Yong-Sheng1, 2, OUYANG Fang2, MEN Xing-Yuan3, GE Feng2, YUAN Zhe-Ming1,*
(1. Hunan Provincial Key Laboratory for Biology and Control of Plant Diseases and Insect Pests, College of Plant Protection, Hunan Agricultural University, Changsha 410128, China; 2. State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China; 3 Institute of Plant Protection, Shandong Academy of Agricultural Sciences, Jinan 250100, China)
Abstract 【Aim】 To clarify the effects of agricultural landscape pattern on ladybeetle community in wheat fields, so as to provide theoretical proofs for ecological regulation and management of insect pests. 【Methods】 Based on the remote sensing data, land cover classification and the survey data of ladybeetle abundance in wheat fields in 22 counties and cities in Shandong, the planting region of wheat was taken as a typical example, the landscape pattern metrics were calculated, and the effects of landscape pattern of farmland, non-crop habitat and regional agricultural landscape on ladybeetle abundance were analyzed using negative binomial generalized linear model. 【Results】 The ladybeetle abundance was positively correlated with mean patch area (AREA_MN) and area-weighted mean patch fractal dimension (FRAC_AM) of grassland and patch richness density (PRD) of regional landscape, and was negatively correlated with area-weighted mean Euclidean nearest neighbor distance (ENN_AM) of non-crop habitat. Grassland, clustered non-crop habitats and diverse regional landscapes benefited ladybeetle abundance. AREA_MN of grassland and ENN_AM of non-crop habitat could best predict ladybeetle occurrence. 【Conclusion】 Grassland, spatial distribution of non-crop habitats and regional landscape diversity are important landscape factors affecting the occurrence of ladybeetles in wheat fields.