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于2009年5—9月在北京密云县采用陷阱法对玉米地、花生地、果园和林地4种生境中步甲群落进行取样,并采用逐步线性回归分析了景观中优势生境类型——玉米地中步甲群落及其捕食性步甲功能群多样性的季节分布,及其与周围100、250和500m半径范围内景观格局指数的关系。结果表明:不同生境下,8月步甲群落、捕食性步甲类群的个体数和物种数均达到最大;5月玉米地中步甲群落的物种数与取样点100m半径范围内的景观连接度呈正相关,8月步甲群落个体数和500m半径范围内的景观连接度呈负相关;5月玉米地中捕食性步甲群落不论是个体数还是物种数均与取样点100m半径范围内景观连接度呈正相关,而8月捕食性步甲的物种数则与100m尺度范围内的半自然生境的类型数呈负相关。可见,景观连接度、半自然生境的类型数对步甲及其中捕食性步甲群落动态的关键季节的多样性状况有显著影响,合理规划农田半自然用地类型组成、增加景观连接度可促进步甲群落多样性保护及其害虫生物控制功能的发挥。
In May-September 2009, Pitfalls were sampled from four habitats in maize, peanut, orchard and woodland by using the trap method in Miyun County, Beijing. The steppe linear regression was used to analyze the type of dominant habitat - corn land The seasonal distribution of the functional diversity of Carabieroga astigmatism and its predatory Carabus, and its relationship with the landscape pattern indices in the 100, 250 and 500 m radius. The results showed that in each habitat, the number of individuals and species of carabid community and predatory carabidie reached the maximum in August. The number of species of carabid community in May and the degree of landscape connection within 100m of sampling point There was a positive correlation between the individual number of beetles in August and the degree of landscape connection within a radius of 500m. In May, the population of predatory beetles in both maize fields and the number of species were all connected with the landscape within a radius of 100m While the number of species in predatory carapace in August was negatively correlated with the number of semi-natural habitats in the 100-m scale. It can be seen that landscape connectivity and the number of semi-natural habitats have a significant impact on the diversity of key seasons in steppe and its predatory steppe community. By reasonably planning the semi-natural land use types, increasing the degree of landscape connectivity can promote the step Protection of diversity of community A and its function of pest biological control.