凤阳山自然保护区针阔混交林空间结构研究

Spatial Structure Parameters of Mixed Stand of Conifer and Broad-leaved Trees in Fengyangshan Nature Reserve

以浙江省凤阳山针阔混交林为研究对象,利用空间结构分析软件Winkelmass和R软件计算林分的空间结构参数二元分布特征。结果表明:①林分的平均角尺度为0.556,林分中处于优势、亚优势、中庸、劣态和绝对劣态的林木株树比大致为1∶1∶1∶1∶1,平均大小比数为0.497,林分的平均混交度为0.715;②各大小比数等级的频率值均集中于中高度混交状态,林分整体格局表现为聚集分布,林木的混交度极高,林分整体属中庸状态。研究结果可为凤阳山针阔混交林的可持续经营和保护提供参考。

We conducted field investigations in conifer and broad-leaved trees of Fengyangshan Nature Reserve and used Winkelmass and R software to analysis the bivariate distribution of structural parameters in this plot.The results indicated that:①the average Uniform angle index was 0.556.The trees of different extents of Dominance had a similar frequency of 1∶1∶1∶1,the average Dominance was 0.497.The average Mingling in the stand was 0.715.②Frequency values of each grade of Dominance were concentrated in middle and high mixed state.The distribution pattern of the plot was aggregated,the whole stand is in transition from moderate mixed to intensity mixed,there is little difference in the quality of trees in the same distribution.