华北落叶松林分空间格局及种间关联性研究

Study on Spatial Pattern and Interspecific Correlation of Larix principis-rupprechtii Forest

为了了解关帝山自然保护区华北落叶松林的空间结构以及探究华北落叶松树种种间关联性,随机布设10块30m×30m的样地,对样地所有进入检尺径阶的立木进行每木检尺,调查了树种、胸径、树高、冠幅、地理坐标及其环境因子,运用角尺度、混交度、大小比数进行空间结构分析。同时,运用O-ring函数对林分进行种间和种内的关联性分析。结果表明:1)华北落叶松纯林样地大部分为随机分布,混交林则团状分布明显;2)华北落叶松纯林在不同尺度下显示出来的关联性较小,混交林中,华北落叶松数量越少种间关联越明显。研究表明:华北落叶松林目前处于中庸向劣态过渡的阶段,正在从顶级群落开始衰退,但华北落叶松依旧在该群落的竞争中处于优势地位,属于优势种群。

In order to understand the spatial structure of Larix principis-rupprechtii forest in Guandi mountain Nature Reserve and explore the correlation of Larix principis-rupprechtii,10 sample plots of 30m×30m were set up randomly.All the standing timbers entering the caliper step in the sample land were measured by each wooden ruler.The tree species,diameter,height,crown width,geographic coordinates and environmental factors were measured,the spatial structure analysis was maked based on the angular scale,mixed degree and size ratio,and the correlation analysis between forests and species was carried out by O-ring function.The results showed that:(1)most of the pure forest samples of Larix principis-rupprechtii were randomly distributed,and the mixed forests has obvious cluster distribution.(2)Larix principis-rupprechtii forests showed less correlation at different scales.The fewer the number of Larix principis-rupprechtii in the mixed forest,the more obvious of interspecific association.The research shows that Larix principis-rupprechtii forest is in the transition from moderate to inferior currently,and is beginning to decline from the top community,but Larix principis-rupprechtii is still dominant in the competition of this community,belonging to the dominant population.