江西九连山常绿阔叶林优势种群的年龄结构与分布格局

Age structure and distribution pattern of the dominant population in the evergreen broad leaved forest of Jiulian Mountain in Jiangxi Province

关键词:  常绿阔叶林  种群年龄结构  种群分布格局  九连山

Key words:  evergreen broad leaved forest  population age structure  population distribution pattern  Mount Jiulianshan

摘要:

以江西九连山常绿阔叶林为研究对象，用“空间序列代替时间变化”的方法，应用统计软件对该地区常绿阔叶林群落优势种群的年龄结构特征和分布格局进行线性回归分析。结果表明：润楠的存活曲线表现为极显著的线性关系，罗浮栲与赤楠等种群的存活曲线表现为显著的线性关系；种群的年龄结构既有稳定型或增长型，也有衰退波动型，如木荷、润楠等种群的年龄结构为稳定增长型，拟赤杨、枫香等种群的年龄结构为衰退型，丝线吊芙蓉、罗浮槭、鹿角栲等种群的年龄结构由稳定型趋向衰退型。应用聚集度指标、方差和均值比率、负二项式分布等方法研究各主要优势种群的分布格局，结果为构成群落乔木层的12个主要优势种群的分布格局均属聚集分布，并符合负二项式分布。

Abstract:

The dominant population age structure and distribution pattern of the evergreen broad leaved forest community in Mount Jiulianshan of Jiangxi Province were analyzed by using the method of spatial sere substituting for temporal sere. The linear regression analysis results were as follows:the survival curves of Machilus microcarpa population was best significantly linear，and the survival curves of Castanopsis fabri and Syzygium buxifolium population were also significantly linear. The age structure of the populations were summed up to be stable，increasing or declining. For example，the age structure of Schima superba and Machilus microcarpa was stable；and that of Alniphyllum fortunei and Liquidambar formasana was declining；while Rhododendron westlandi，Acer fabri and Castanopsis lamontiiprocessed from stable to declining. The spatial distribution pattern of the main dominant population was studied by using aggregate indices，variance ratio and the Possion distribution methods. The results showed that the spatial distribution pattern of all each 12 dominant trees were aggregated pattern，which were also consonant with the Possion distribution of all the plots.