生态学杂志2017，Vol.36Issue(6)：1531-1538,8.DOI:10.13292/j.1000-4890.201706.014
水杉原生母树种群结构与动态
Population structure and dynamics of Metasequoia glyptostroboides parent trees
摘要
Abstract
The population structure and dynamics characters reflect the survival status of plant species and their interactions with environment.Metasequoia glyptostroboides,a famous living fossil,is one of the greatest botanical discoveries of the 20th century.Even extensively planted around world,we still know little about the current population status of M.glyptostroboides parent trees in the natural ecosystem.In this study,the population structure and dynamics were analyzed based on the investigation data on the natural population of M.glyptostroboides parent trees.The results showed that:(1) The natural regeneration of M.glyptostroboides was extremely weak and the individuals ＜40 cm DBH (diameter at breast height) only accounted for 4.5％ of the total population.The spindle-shaped DBH structure indicated a depression tendency for M.glyptostroboides population.(2) The survival rate of the population was low for young individuals and the survival ability of middle aged individuals were strong.After reaching Ⅷ class age,the number of survival individuals decreased greatly.The survival curve of the population approached to Deevey-Ⅲ type.(3) The population showed a slight decrease at the early stage,fluctuation at the middle stage and depression at the late stage.The young stage was the fragile period during the population life history.After the Ⅷ class age,the population entered the period of physiological recession.(4) The time sequence analysis predicted that the number of young and middleaged individuals would gradually decrease and old individuals would increase for the upcoming eight years.It's very hard to maintain the long-term stability of M.glyptostroboides population.Our results indicated that the extreme lack of young individuals was the main reason for the depression tendency of M.glyptostroboides population.In order to restore population,it's urgent to provide proper artificial aid recovery and reinforce protection of existing parent trees as well as their habitats.关键词
种群结构/静态生命表/存活曲线/生存分析/时间序列预测Key words
population structure/static life table/survival curve/survival analysis/time sequence analysis引用本文复制引用
林勇,艾训儒,姚兰,郭秋菊,张敏霞,陈俊..水杉原生母树种群结构与动态[J].生态学杂志,2017,36(6):1531-1538,8.基金项目
国家重点研发计划课题(2016YFC0503102)资助. （2016YFC0503102）
