中文摘要：

[目的]探究城市绿地中臭椿更新苗的数量特征、存活情况及空间分布格局,为城市绿地生境下乔木的天然更新和人工干扰或促进更新提供理论依据。[方法]运用种群静态生命表,点格局分析法中的双关联函数G（r）、H（r）函数分析臭椿更新苗的生存状况,空间分布格局及各龄级间的空间关联性。[结果]更新苗种群结构存在波动性,存活曲线趋于DeeveyⅡ型,低龄级和中龄级个体数量丰富,个体死亡率和消失率在前期和后期较稳定,中期先减后增,超过第5龄级（8～10cm）后,个体死亡率和消失率出现高峰。[结论]一侧和两侧铺装样地在空间上都呈现出不同程度的聚集分布,聚集强度随尺度距离的增大呈减小趋势,一侧铺装样地在尺度接近3.7m处有转为随机分布的趋势。龄级间,小尺度内多表现为无关联,随着尺度增加呈正显著相关;两侧铺装有正关联的龄级组合比一侧铺装样地多;较大尺度上,用径级代表龄级的更新苗间相关关系越接近,正关联越强。

英文摘要：

[Objective] The quantitative characteristics, the survival condition and the spatial distribution pattern of Ailanthus altissirna regenerated saplings were investigated and analyzed to provide theoretical bases for natural regeneration of arbor, human-induced disturbance regeneration, and other regeneration promotion in urban green space habitat. [Methods] Time-specific life table, paired correlation function G（r） and H（r） were utilized to analyze the seedlings＇ living conditions, the distribution pattern and spatial association among seedlings with different age classes. [Results] There was a fluctuation in the structure of Ailanthus altissima regenerated saplings＇ population. The individuals at young and middle age-class were abundant, and the type of survival curve of the population was regarded as Deevey Ⅱ. Lifespan＇s curve of mortality rate and disappearance rate all had a stable stage in the early and late period, while in the middle period, the two items experienced decrease and increase successively. Individual mortality and disappearance rates reached the top peaks beyond the 5th age-class（8-10 cm）. [Conclusion] Regenerated saplings were significantly aggregated in different degree and the aggregation intensity weakened with the increase of scale in both two pavement＇s types. The type of one side＇s pavement seemed randomly distributed when the scale is close to 3.7 m. There is almost no correlation relationship at small scale, however, when scale increased, positive correlation relationships between seedlings of different age classes was detected. The closer the age class of the regenerated saplings was, the stronger the positive correlation was.