安徽琅琊山青檀种群结构与空间分布格局研究

Population structure and spatial distribution pattern of Pteroceltis tatarinowii in Langyashan Mountain of Anhui Province

关键词:  青檀  种群结构  分布格局

Key words:  Pteroceltis tatarinowii   population structure  distribution pattern

摘要:

通过设置500 m2样方8个，应用“相邻格子法”获取野外资料，采用空间序列代替时间的方法与6种聚集度指标，对安徽琅琊山青檀的种群结构与空间分布格局进行了研究。结果表明：(1)各样地的青檀种群结构大致可分为增长型、稳定型和衰退型3种类型；(2)不同样地青檀种群分布格局主要为集群分布；(3)不同发育阶段种群分布格局有所差异，总体上有集群分布向随机分布、聚集度高向聚集度低的变化趋势；(4)不同区组大小的青檀种群分布格局不同，但在不同样地之间差异不明显，种群的格局规模大体为16 m2和32 m2。青檀种群结构和格局动态与群落区域的小生境，青檀本身生物学、生态学特性以及人为干扰有密切关系。

Abstract:

Population structure and spatial distribution pattern of Pteroceltis tatarinowii in Langyashan Mountain of Anhui Province were studied in this paper. 8 plots of 500 m2 were respectively established. Sample data obtained in contiguous grid quadrate，substituted spatial series for time series and six aggregate indexes were used in this study. The results showed:(1)Population structure of P.tatarinowii in 8 plots presented growing，stable or senescent type；(2)Population distributions were mostly clumped；(3)At different developmental stages，distribution pattern presented a trend from clump to random and aggregation intensity decreased somewhat；(4)Size of blocks affected the spatial distribution pattern and the pattern scales of 8 plots were about 16 m2 and 32 m2. It proved that the spatial distribution pattern of P.tatarinowii populations were closely related to its biological and ecological characteristics，community composition，environmental factors and human disturbance.