• 研究报告 •

水杉原生母树种群结构与动态

1. 1湖北民族学院林学与园艺学院， 湖北恩施 445000； 2北京林业大学自然保护区学院， 北京 100083； 3浙江农林大学林业与生物技术学院， 浙江临安 311300）
• 出版日期:2017-06-10 发布日期:2017-06-10

Population structure and dynamics of Metasequoia glyptostroboides parent trees.

LIN Yong1, AI Xun-ru1*, YAO Lan1,2, GUO Qiu-ju1, ZHANG Min-xia3, CHEN Jun1#br#

1. (1School of Forestry and Horticulture, Hubei University for Nationalities, Enshi 445000, Hubei, China; 2School of Nature Conservation, Beijing Forestry University, Beijing 100083, China; 3School of Forestry and Biotechnology, Zhejiang Agriculture and Forestry University, Lin’an 311300, Zhejiang, China)
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• Online:2017-06-10 Published:2017-06-10

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 middleaged 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.