摘  要  【目的】 探究甘南亚高山区步甲科昆虫群落特征和多样性的时序变化，分析其对环境因子的响应，为甘南亚高山区生态动态监测及步甲科昆虫的生物多样性的保护提供科学依据。【方法】 2018-2019年采用巴氏诱罐法在6 月上半月、6月下半月、7月上半月、7月下半月、8月上半月、8月下半月和9月上半月，共 7 个时间采集步甲，室内进行分类鉴定，分析甘南亚高山区步甲科昆虫群落的时序分布和多样性特征及其与环境因子的关系。【结果】 共采集步甲科成虫2 418头，经鉴定隶属16属33个种。青步甲属、通缘步甲属、斯步甲属、蜗步甲属和步甲属共同构成了该地区的优势类群；步甲科昆虫属水平物种数和多样性时序动态呈单峰型变化，均在7月下半月达到最高值。时序波动对步甲个体数、物种数、Shannon多样性（H’）和Pielou均匀度（J）均具有显著影响（Q_6,28=30.994；P <0.000；F_6,28= 111.250，P < 0.05；Q_6,28=30.994，P <0.000；Q_6,28=30.994，P <0.001）。步甲科昆虫群落与环境因子间RDA分析表明平均气温、地表温度和降雨量3个环境因子是影响步甲科昆虫群落时序动态分布主要因素，相对湿度次之。地表温度和平均气温是影响步甲优势类群的主要因素。【结论】 步甲科昆虫群落的特征及多样性与时序变化均存在显著线性关系，温度是影响步甲科昆虫群落时序分布特征的最主要因素。

Abstract  [Aim]  To investigate the temporal dynamics of carabid beetle (Carabidae) communities, and how this is affected by climatic factors, in subalpine forests of southern Gansu. [Methods]  Responses of the dominant group were compared at different times to provide a scientific basis for environmental monitoring and the protection of carabid beetle diversity. Pitfall traps were used to collect beetles in first half of June (June-E), second half of June (June-L), first half of July (July-E), second half of July (July-L), first half of August (Aug.-E), second half of August (Aug.-L) and first half of September (Sept.⁃E) between 2018 and 2019. Captured carabid beetles were classified and identified in a laboratory, and their dominance, diversity and similarity indices determined. [Results]  A total of 2 418 adult carabid beetles from 33 species and 16 genera were collected and identified. Among these, Chlaenius, Pterostichus, Straneostichus, Cychrus and Carabus were the dominant groups. The abundance and diversity of carabid beetles underwent a unimodal change over time, with both peaking in late July. Temporal dynamics had a significant impact on the number of individuals, species, Shannon-Winner diversity index (H′) and Peilou evenness index (J) (Q_6,28 = 30.994; P < 0.000; F_6,28 = 111.250, P < 0.05; Q_6,28 = 30.994, P <0.000; Q_6,28 = 30.994, P < 0.001). A correlation analysis (RDA) indicates that climatic factors such as average air temperature, surface temperature and rainfall, followed by relative humidity, were the main factors affecting the temporal dynamics of the carabid beetle community. Surface temperature and average air temperature were the most important factors affecting the dominant groups. [Conclusion]  There is a significant linear relationship between the species diversity, abundance and occurrence of carabid beetles in the subalpine forests of southern Gansu. Temperature is the most important factor affecting the temporal distribution of the carabid beetle community.