长白山西坡苔原带地表甲虫群落结构分析

Community Structure of Ground Beetles in West Slope Tundra Zone of Changbai Mountain

为评价地表甲虫在维持苔原生境的作用,对长白山西坡苔原带地表甲虫的物种组成及时空分布格局进行研究。2005—2007年,在长白山西坡苔原带利用陷阱法采集"常绿灌丛"亚带和"半荒漠"亚带的地表甲虫,共采集723头,隶属于11科,41种,步甲科和埋葬甲科为优势类群。"常绿灌丛"亚带中地表甲虫物种数和个体数都高于"半荒漠"亚带,地表甲虫的物种数、个体数、丰富度指数、多样性指数都是7月和8月远高于其他月份。长白山苔原带环境条件恶劣,地表甲虫的多样性较低,步甲科和埋葬甲科具有相对较强的适应能力。地表甲虫的活跃高峰期相对较长,集中在7月和8月,显示出其对环境变化具有较强的抵抗能力。

The species composition and temporal and spatial distribution pattern of ground beetles in the tundra zone of the west slope of Changbai Mountain were studied,which will provide a reference for evaluating the role of ground beetles in maintaining tundra habitats.The ground beetles were collected by pitfall method in"evergreen bushwood"subzone and"semidesert"subzone in west slope tundra zone of Changbai Mountain from 2005 to 2007.A total of 723 specimens were collected,belonging to 11 families and 41 species,and Carabidae and Silphidae were the dominant groups.The number of species and individuals of ground beetles were more in"evergreen bushwood"subzone than in"semidesert"subzone.The species number,individual number,richness index and diversity index were higher in July and August than in other months.The environmental conditions of the tundra were poor in Changbai Mountain,the diversity of ground beetles was low,and Carabidae and Silphidae had relatively stronger adaptability.The active peak of ground beetles was relatively long,concentrating in July and August,showing a strong resistance to environmental changes.