中文摘要：

植物群落的分布格局与空间尺度有着密切关系。在传统取样方法下,只能研究一种尺度下的格局,与之相比点格局分析法是以种群个体空间分布的坐标点图为基础,通过单一的分布情况分析各种尺度下的格局。该文通过点格局分析对北京小龙门地区元宝枫分布格局、各龄级的分布格局以及其与其他乔木的相关关系进行了研究。结果表明：元宝枫在样地内呈明显的集群分布,各龄级密度差异显著。幼龄级在小尺度下集群分布,大尺度下随机分布;随着龄级的增长,种群显著地趋于随机分布。核桃楸是该群落的优势种,且元宝枫和核桃楸、大叶白蜡、小叶椴之间在不同尺度下相关关系不同。

英文摘要：

The distribution pattern of plant populations is closely related to spatial scale.By traditional sampling method,only one-scale point pattern can be studied.By comparison,point pattern analysis method is based on spatial mapped points of individual distribution and can analyze patterns under all scales along a gradient.The results are more consistent to the reality,especially for population structure.By using point pattern analysis method,the distribution pattern of all age-classes of Acer truncatum in Xiaolongmen Reserve,Beijing and its relationship with that of other arbors were studied.The results show that the distribution of Acer truncatum Bunge in the sampling area is centralization distribution,and it varies from age class to age class.Other arbors have obvious（positive or negative） effects on the distribution of Acer truncatum.The relationship between Acer truncatum and Juglans mandshurica,Tilia cordata,Fraxinus americana L var juglandifolia Rehd is different.