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天然栎类阔叶混交林是皖南山区低山丘陵常见植被类型。本文以铜陵县叶山林场天然栎类阔叶林为研究对象,通过大样地调查,采用Ripley’s K(d)点格局分析法对优势种群空间格局及其关联性进行了分析。结果表明,优势种群栎类直径分布呈偏左正态分布,具有同龄林直径分布特点,为发展种群。在种群空间格局上,麻栎在0～39 m的尺度上为聚集分布,在40～42 m尺度上为随机分布,在大于41 m尺度上为均匀分布。青冈栎在0～40 m尺度上聚集分布,在41～47 m尺度上呈现随机分布,大于47 m尺度上均匀分布。在种群的空间关联性上,麻栎和青冈栎在0～34 m尺度上负相关,在大于43 m的尺度上呈现出显著的正相关。麻栎和青冈栎大树(胸径≥20 mm)和小树(胸径<20 mm)之间的关联性都表现为小尺度上(0～25 m)正关联,大尺度(51～65 m)上的负关联,中等尺度上(26～50 m)的不显著关联。在大多尺度上,栎类与其伴生树种都无显著关联。
The natural oak broad-leaved mixed forest is a common type of vegetation in the hilly area of southern Anhui. In this paper, the natural oak broad-leaved forest in Yeshan Forest Farm of Tongling County was taken as the research object. The spatial distribution pattern of dominant species and their relationship were analyzed by using Ripley’s K (d) point pattern analysis through a large sampling site. The results showed that the diameter distribution of the oaks in the dominant species was left-normal distribution, with the same age distribution of diameter of the forest for the development of populations. In the spatial pattern of population, Quercus acutissima aggregated in the scale of 0-39 m, randomly distributed on the scale of 40-42 m and uniformly distributed on the scale of more than 41 m. Quercus glauca aggregated on 0 ~ 40 m scale, distributed randomly on the scale of 41 ~ 47 m, and distributed evenly on the scale of 47 m. In the spatial correlation of populations, C. oak and C. glauca were negatively correlated at 0 ~ 34 m scale and showed a significant positive correlation at scales over 43 m. The correlations between large trees (DBH> 20 mm) and trees (DBH <20 mm) of Quercus acutissima and Quercus glauca show the positive correlation between small scale (0-25 m) and large scale (51-65 m) Negative correlations on the middle scale (26-50 m) were not significantly associated. At most scales, the oaks and their associated trees were not significantly related.