江苏云台山山樱花种群结构及点格局分析

【目的】了解分析并掌握连云港云台山山樱花(Cerasus serrulata)天然种群的结构特征、分布格局、物种多样性及其与生态环境影响因子的关系,为优良景观树种山樱花的种质资源保护与利用提供理论依据。 【方法】以江苏省连云港市云台山省级自然保护区1 hm²固定样地山樱花为研究对象,通过探究年龄结构、绘制存活曲线、编制静态生命表、预测时间序列和点格局分析,以期对该山樱花种群有进一步的了解。 【结果】样地中乔木层短柄枹栎和山樱花的重要值最高,是群落的主要建群种,山樱花作为群落优势种之一的情况并不常见,其种群径级结构呈“扩张型”,低龄级个体数量较为丰富。静态生命表显示:山樱花植株个体平均生存能力随龄级增大而减小;存活曲线呈Deevey-Ⅱ型。根据时间序列预测的结果推断,未来2、4、6个龄级时间后山樱花种群各龄级个体数均逐渐增加,种群能自然更新。山樱花种群各年龄段的植株密度存在较大差异,整体呈随机分布或集中分布。【结论】暖温带落叶阔叶林优势种以壳斗科为主,朴树、黄连木等也是常见的优势树种,以山樱花为优势种之一的并不多见。云台山山樱花种群结构呈持续稳定的状态,自然更新能力较强,在云台山保护区地带性植被恢复与风景林构建中发挥了重要作用,应加大保护力度。同时也说明通过上述方法揭示特定种群的结构及数量特征,对特殊群落的保护和管理具有重要的理论价值与现实意义。

Analyses of Cerasus serrulata population structure and point patterns in Yuntai Mountain,Jiangsu

【Objective】The aim of this study is to understand, analyze and master the structural feature, distribution patterns, species diversity and relationships of Cerasus serrulata in natural populations on the east hillside of Yuntai Mountain, Lianyungang, which will provide a theoretical basis for the protection and utilization of germplasm resources of this landscaping tree species.【Method】Based on the survey data of the 1 hm ² fixed sample plot in the Yuntai Mountain Provincial Nature Reserve in Jiangsu Province, we explored the age structure of the C. serrulata population, and drew a static life table and survival curve to forecast time series and analyze point patterns.【Result】① In this sample, Quercus serrata and C. serrulata, which are the main building species of the community, have the highest important values, but it is not common to see the latter as one of the dominant species in the community. The diameter structure of its population is “expanding,” and the population of its younger class is relatively abundant. ② The static life table shows that the average individual viability of C. serrulata decreases with the increasing age class and that the survival curve of C. serrulata is closer to Deevey-Ⅱ. ③ The time prediction of the population age class shows that the number of individuals in each age class of the C. serrulata population will gradually increase, and that the population can naturally renew in the next two, four and six periods of age class. ④ There is a large difference in the plant density at each age group of the C. serrulata population and the whole is either randomly distributed or clustered. 【Conclusion】Fagaceae is one of the most dominant species in warm temperate broadleaved deciduous forests, both Celtis sinensis and Pistacia chinensis are also common dominant species, whereas C. serrulata is not. The population structure of C. serrulata in the Yuntai Mountain is in a stable state with a strong natural regenerative ability. Because it has played an essential role in the zonal vegetation restoration and scenic forest construction, while its protection should be strengthened. At the same time, this study also shows that revealing the structure and quantitative characteristics of special populations through the above-mentioned methods has an important theoretical value and practical significance for the protection and management of special communities.