【摘要】 对北京东灵山地区的两个辽东栎（ＱｕｅｒｃｕｓｌｉａｏｔｕｎｇｅｎｓｉｓＫｏｉｄｚ．）种群的结构和数量动态进行了研究。在研究种群的空间分别格局时，分别将两个种群中的每个辽东栎个体在样地中进行定位。将辽东栎个体按不同尺度大小分为４类，在每一尺度中，按不同格子尺度进行随机取样，分别计算Ｍｏｒｉｓｉｔａ的分布指数（Ｉδ），聚块性指数（ｍ／ｍ），方差／均值比（Ｖ／Ｘ—）。用这些指数判断辽东栎不同大小级别以及不同取样尺度上的格局强度。结果表明，两个种群的格局强度都随尺度的不同而变化。５０龄辽东栎林中大幼树（高度１～２ｍ）表现为最强的聚集分布，然后是小幼树（０．４～１ｍ）、幼苗（０．４ｍ）和大树（２ｍ）。３０龄辽东栎林中，在发育的早期阶段（即从幼苗到大幼树阶段），幼苗格局最强，然后格局随辽东栎个体尺度的增大逐渐减小。对大小结构的研究表明，５０龄的辽东栎种群的大小结构具有稳定的结构，能够长时间生存发展下去；３０龄种群中的个体之间的竞争现象非常激烈，大小结构表现为衰退状态，但是经过自我调整，可发展为稳定结构。通过研究，作者建议在森林的经营和管理上，对辽东栎林可在其生长到一定时期进行适度干扰（例如择伐处理等），会更有利于?更多还原

【Abstract】 The spatial distribution and size class of Quercus liaotungensis, a deciduous canopy species, was studied in two warm temperate deciduous forests (ca. 50 and 30 year old) in Northern China. Pattern of spatial dispersion varied with size class and the scale of observation. In the 50 year old forest, the most clumped distribution appears in the tall saplings (1 to <2 m in height) and in the order of short saplings (0.4 to < 1 m in height), seedlings(≤0.4 m in height) and adults (≥2 m in height). The class distribution of Q. liaotungensis was nearly a reverse J shape for the 50 year old forest, suggesting that the population regenerates continuously. In the 30 year old forest, as for the class from seedlings to saplings, the most clumped distribution appear in the seedlings, followed by the short saplings and tall saplings. The class distribution indicates that the population does not regenerates continuously, probably due to the high tree density. These results suggest that managing forest with some disturbance (e.g. selective cutting) is more beneficial for forest regeneration than protecting without any human activities.更多还原