Abstract: Distribution patterns and processes of Aconitum leucostomum populations in Nalati rangeland were studied using cluster analysis and adjacent lattice methods to determine spatial distribution and mechanisms of community internal structure. Results indicated that Aconitum leucostomum was uniformly distributed with population dominance between 2.174~3.6 and 6.62~6.983. Distribution patterns were uniform at different quadrate areas but had diversity at different scales. Quadrate areas of both 4 m² and 32 m² showed the largest distribution scales. There was significant linear relationship between density and quadrate area. The distribution pattern of Aconitum leucostomum was basically stable at small scale and point distributed uniform pattern in each dimension with diversity in different locations.

Key words: Spatial distribution patterns, Cluster analysis, Adjacent lattice method, Uniform distribution

摘要： 采用聚类分析方法和邻接格子样方法对那拉提草原毒害草白喉乌头(Aconitum leucostomum)种群格局进行研究,以期探明其种群空间分布格局类型和分布规律,了解种群群落内部结构形成机制及群落分布成因。结果表明:白喉乌头在群落中的优势度在2.174~3.6和6.62~6.983范围内,呈现均匀分布,平均密度为0.58株·m^-2;不同样方面积下呈现均匀分布,不同尺度下表现出一定的差异性,样方面积在4 m²和32 m²时,白喉乌头格局规模最大;白喉乌头密度与样方面积呈极显著的线性关系。白喉乌头的分布格局在较小尺度上格局规模基本上比较稳定,空间点格局在各尺度上呈现均匀分布,但不同地点还是表现出尺度上的差异。

关键词: 空间格局, 聚类分析, 邻接格子样方法, 均匀分布