摘要
基于灵空山自然保护区油松林内设置的70 m×90 m的二叶舌唇兰样地的调查数据为基础,应用扩散系数C、平均拥挤度X*、Ca指标、丛生指数I、聚块性指数、负二项分布等聚集度指标研究二叶舌唇兰(Platnthera chlorantha)种群的分布格局与聚集强度。结果表明:在5 m×5 m、1 m×1 m的取样尺度下,二叶舌唇兰种群的分布格局均表现为聚集分布,且在1 m×1 m的小取样尺度下聚集强度较强;聚集原因在于其种子扩散的有限性及环境空间的异质性。
Based on the census of platnthera chlorantha quadrats covering 70 m × 90 m in Lingkong Mountain Nature Reserve,their spatial distribution pattern and aggregating intensities were studied with some aggregation indexes such as dispersion（ C）,mean crowding（ M＊）,index of Cassie（ Ca）,index of plumping（ I）,index of patchiness,negative binomial parameter K,and so on. The results showed that under different sampling size of 5 m × 5 m and 1 m × 1 m,the populations of P. chlorantha were all distributed as aggregation,and the aggregation of the populations was higher under the sampling size of 1 m × 1 m. It is concluded that aggregated distribution was due to the limitation of seed dispersal and spatial heterogeneity of environment.
出处
《环境科学与管理》
CAS
2015年第3期146-148,共3页
Environmental Science and Management
关键词
二叶舌唇兰
分布格局
灵空山
platnthera chloranthy
distribution pattern
Lingkong Mountain
