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植物研究 ›› 2020, Vol. 40 ›› Issue (6): 855-866.doi: 10.7525/j.issn.1673-5102.2020.06.008

• 研究报告 • 上一篇    

天然珙桐种群结构与动态特征在高低纬度地区的差异

徐云飞1,2, 刘沁松1,2, 徐文娟1,2, 唐俊峰1,2, 董廷发1,2, 杨宝臻1, 胥晓1,3()   

  1. 1.西南野生动植物资源保护教育部重点实验室,南充 637009
    2.西华师范大学生命科学学院,南充 637009
    3.西华师范大学西南山地特色植物种质适应与利用研究所,南充 637009
  • 收稿日期:2020-06-01 出版日期:2020-11-20 发布日期:2020-11-04
  • 通讯作者: 胥晓 E-mail:xuxiao_cwnu@163.com
  • 作者简介:徐云飞(1994—),硕士研究生,主要从事植物生态研究。
  • 基金资助:
    西华师范大学英才基金项目(17YC351);国家自然科学基金项目(31900277);第二次青藏高原综合科学考察项目(2019QZKK0404)

Differences in Population Structure and Dynamic Characteristics of Davidia involucrata Baill. Between High and Low Latitude Regions

Yun-Fei XU1,2, Qin-Song LIU1,2, Wen-Juan XU1,2, Jun-Feng TANG1,2, Ting-Fa DONG1,2, Bao-Zhen YANG1, Xiao XU1,3()   

  1. 1.Key Laboratory of Southwest China Wildlife Resources Conservation,Ministry of Education,Nanchong 637009
    2.College of Life Sciences,China West Normal University,Nanchong 637009
    3.Institute of Plant Adaptation and Utilization in Southwest Mountain,China West Normal University,Nanchong 637009
  • Received:2020-06-01 Online:2020-11-20 Published:2020-11-04
  • Contact: Xiao XU E-mail:xuxiao_cwnu@163.com
  • About author:XU Yun-Fei(1994—),master student, majoring in plant ecology.
  • Supported by:
    Talents Foundation of China West Normal University(17YC351);National Natural Science Foundation of China(31900277);The Second Tibetan Plateau Scientific Expedition and Research Program(2019QZKK0404)

摘要:

作为我国特有的珍稀濒危物种,天然珙桐(Davidia involucrata Baill.)的种群特征已被众多文献所报道,但纬度变化对其结构和动态的影响还未见研究。本研究对比分析了四川平武县和云南滇东北两个地处相似经度而不同纬度区域的天然珙桐种群的年龄结构动态指数、静态生命表、生存力及其数量变动差异。结果表明:高、低纬度种群结构均为增长型,两地种群的存活曲线均属于Deevey-Ⅱ型,与高纬度的平武县种群相比,低纬度的滇东北珙桐种群表现出更高的增长趋势和较强的种群抗干扰能力;种群动态特征分析结果表明,高纬度的平武县珙桐种群幼龄级个体生长较好,中龄级个体竞争激烈,低纬度的滇东北种群幼龄级个体死亡率高,中龄级个体生长稳定。综上,天然珙桐种群结构和动态特征存在纬度差异。低纬度地区的珙桐幼树存活率低,但成年个体生长良好;高纬度地区的珙桐幼树生长较好,但中龄级个体死亡率高。

关键词: 珙桐, 年龄结构, 静态生命表, 存活曲线, 生存力

Abstract:

Davidia involucrata Baill. is a rare and endangered tree species which is endemic to China. Though population characteristics of D.involucrata have been reported by many studies, the effect of latitude on the structure and dynamic characteristics of D.involucrata has been largely neglected. In this study, we compared the variance of the age structure dynamic index, static life table, viability and quantity alteration of the populations between high latitude region(Pingwu) and low latitude region(Northeastern Yunnan). Our results showed that the population structure in Pingwu and Northeastern Yunnan were of growth type, the survival curve of the two D.involucrata populations was of a Deevey-Ⅱ type, and the population in Northeastern Yunnan displayed a higher growth trend and stronger anti-interference ability. Moreover, the population dynamics analysis revealed that younger individuals grew better in Pingwu and the middle-aged individuals competed fiercely. By contrast, younger individuals in Northeastern Yunnan population had high mortality, middle-aged individuals grew stable. Thus, based on the abovementioned findings, we conclude that latitude differences could affect population structure and dynamic characteristics of D.involucrata. The habitats of D.involucrata population at low latitude were suitable for middle-aged individuals to survive but not for younger individuals; younger individuals of D.involucrata populations at high latitude grew better, and higher mortality rate was observed in middle-aged individuals.

Key words: Davidia involucrata Baill., age structure, static life table, survival curve, viability

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