摘要
目的:探讨了南京老山国家森林公园秤锤树天然种群的动态及空间尺度和空间格局之间关系,为进一步深入了解秤锤树天然群落格局的整个更新变化过程提供依据。方法:设置南京老山秤锤树天然种群动态监测固定样地。根据野外调查数据,基于生存分析理论和种群生命表,采用分段匀滑技术,编制秤锤树天然种群特定时间生命表,绘制曲线图,进行空间格局分析。结果:(1)秤锤树种群高龄级个体相对较少,存活曲线趋于Deevey-Ⅱ型,种群各龄级有相近的死亡率,目前处于稳定状。(2)各径级间关系密切,基本上呈显著正关联,有利于促进秤锤树幼苗与幼树,在经过自然选择和种内竞争之后存活下来,以确保种群的生存和发展。(3)秤锤树幼苗呈现出一定的空间互补性和聚集性,在种群群落中分布较聚集;而秤锤树幼树具有较好的一致性,无明显聚集分布。结论:南京老山秤锤树低龄级的居多,近年状态保持稳定,不同径级间的关系密切,以正关联为主。
Objective:The dynamics of the natural population of Sinojackia xylocarpa Hu in Nanjing Laoshan National Forest Park,and the relationship between spatial scale and spatial pattern were discussed. It provides a basis for further understanding the regeneration process of the natural community pattern of S. xylocarpa Hu. Methods:One permanent sample plot was established to monitor the population dynamics of natural S. xylocarpa Hu in Nanjing Laoshan. Based on field investigation data,population life table and the theory of survival analysis,Piecewise smoothing technology was adopted to compile the time-specific life table for the population of natural S. xylocarpa Hu curve drawing and the spatial pattern analysis. Results:(1)Currently,it is stable,and there is relatively fewer older age-groups. The survival curve tends to Deevey-Ⅱ,and the population has similar mortality at all ages.(2)There existes a close relationship between the diameters of the classes,with a significant positive correlation,which is conducive for promoting the survival of S. xylocarpa Hu seedling and sapling after natural selection and intraspecies competition,thus ensuring the population′s survival and development.(3)S. xylocarpa Hu seedlings have aggregated distribution in species community,showing certain aggregation and spatial complementarity,while S. xylocarpa Hu saplings don′t have obvious aggregated distribution,showing good consistence. Conclusion:Most S. xylocarpa Hu in Nanjing Laoshan are stable in recent years. The relationship between the diameters of the different classes is close,with a significant positive correlation.
作者
孔景
杨国栋
季芯悦
王鹏程
伊贤贵
俞元春
Kong Jing;Yang Guodong;Ji Xinyue;Wang Pengcheng;Yi Xiangui;Yu Yuanchun(Co-Innovation Center for the Sustainable Forestry in Southern China,College of Biology and the Environment,Nanjing Forestry University,Nanjing 210037,China;Jiangsu Province Key Lab.of Environmental Engineering,Jiangsu Provincial Academy of Environmental Science,Nanjing 210036,China)
出处
《中国野生植物资源》
CSCD
2021年第10期100-108,共9页
Chinese Wild Plant Resources
基金
国家自然科学基金项目(31300558)
江苏省基础研究计划项目(BK20130972)。
关键词
南京老山
秤锤树种群
种群数量动态
生存分析
空间分布格局
Laoshan Mountain Nanjing
Sinojackia xylocarpa population
Quantitative dynamics of population
Survival analysis
Spatial distribution pattern
