镇沅县思茅松天然林空间结构特征分析

以云南省镇沅县思茅松天然林为研究对象,对森林资源连续清查的固定样地进行调查,应用林分角尺度、林分混交度和林分大小比数等空间结构指标,对思茅松天然林空间分布格局、树种隔离程度和林木生长竞争等进行综合分析。结果表明,在林木空间配置上,林分平均角尺度达0.53,反映出思茅松天然林主要呈现聚集分布的空间分布格局;在思茅松天然林分的树种混交方面呈现零度到弱度的空间隔离程度,树种混交程度较低,存在相同树种聚集生长现象,随着径阶组由小到大,思茅松天然林分的混交度逐渐由高到低,表现出由中度混交到弱度混交再到零度混交的趋势;在林木生长竞争方面,研究区思茅松天然林林木主要呈现中庸状态。

Spatial Structure Characteristics of Pinus kesiya Natural Forest in Zhenyuan County

The fixed sample plots of continuous forest inventory were investigated,and the spatial structure indexes such as forest stand average uniform angle,stand mixing degree and average neighborhood comparison were applied to analyze the spatial distribution pattern,tree species isolation and growth competition of Pinus kesiya natural forest in Zhenyuan County.The results showed that the stand average uniform angle was 0.53,which reflected the aggregation distribution pattern of Pinus kesiya natural forest;the spatial isolation degree of tree species was from zero to weak,and the degree of tree species mixing was low with the aggregation growth status of the same tree species,and the mixed degree of the stand was gradually from high to low with the increase of diameter class group,showing a trend from moderate mixed to weak mixed and then to zero mixed;the growth competition of Pinus kesiya natural forest in the study area mainly showed a moderate state.