By the method of pitfall trap sampling, an investigation was conducted on the carabid assemblage in four typical habitats (maize field, peanut field, orchard, and semi-natural woodland) in the agricultural landscape in Xitiange Village of Miyun County, Beijing. Among the four habitats, orchard had the highest alpha-diversity of carabid assemblage, followed by woodland and maize field, and peanut field had the lowest one. The species composition of the assemblage in woodland, peanut field, and orchard had evident difference, but was similar to that in maize field to some extent. The number of the individuals of predatory and omnivorous carabid sub-assemblages was larger in orchard, and the predatory sub-assemblage presented more distinct difference in its species turnover rate than the omnivore sub-assemblage among the habitats. This study showed that low-intensively managed orchard habitat could sustain higher alpha-diversity of carabid assemblage than semi-natural woodland habitat, and the landscape with diversified habitats could benefit the beta-diversity of carabid assemblage and its predatory sub-assemblage. To attach importance to the conservation of diversified habitats and low-intensively managed farmland habitat would have significance for the conservation of carabid assemblage diversity and its pest control function in agricultural landscape.
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