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以大围山山顶杜鹃灌丛为研究对象,设置了6个15 m×15 m的样地。采用方差/均值比率法的t检验对杜鹃灌丛的空间格局进行了分析,同时采用负二项式参数、丛生指数、平均拥挤度指数、聚块性指数、扩散指数、格林指数和Cassic指数分析了群落内木本植物的聚集强度。结果表明:14种常见木本植物(如杜鹃Rhododendron simsii、湖南白檀Symplocos hunanensis、四川冬青Ilex szechwanensis)中,有85.7%的物种表现为聚集分布格局;聚集强度随种群密度的增大而减小;非优势种群直角荚蒾(Viburnum foetidum var.rectangulatum)、水马桑(Weigela japonica var.sinica)、鹿角杜鹃(Rhododendron latoucheae)的聚集强度大于优势种群杜鹃、湖南白檀等;植物对山顶温凉湿润气候条件的适应能力,种子扩散方式、萌生能力和耐荫特性等生物学特性,以及干扰是决定杜鹃灌丛木本植物空间格局的主要驱动因子。
Taking Daqiaoshan mountain rhododendron shrub as research object, six plots of 15 m × 15 m were set up. Spatial patterns of Rhododendron shrubs were analyzed by the t-test of variance / mean ratio method. At the same time, negative binomial parameters, clustering index, average crowding index, polybrominal index, diffusion index, Green index and Cassic index The community gathered woody intensity. The results showed that 85.7% of the 14 species of common woody plants (Rhododendron simsii, Symplocos hunanensis and Ilex szechwanensis) showed aggregative distribution pattern; the aggregation intensity decreased with the increase of population density; The aggregative intensity of Viburnum foetidum var. Rectangulatum, Weigela japonica var.sinica and Rhododendron latoucheae was greater than that of dominant species Rhododendron simonii and Hunan white sandalwood. The adaptability of conditions, biological characteristics of seed dispersal, germination ability and shade tolerance, as well as the disturbance are the main driving factors to determine the spatial pattern of rhododendron shrub woody plants.