植物生态学报 ›› 2023, Vol. 47 ›› Issue (12): 1684-1692.DOI: 10.17521/cjpe.2022.0488

• 研究论文 • 上一篇    下一篇

珍稀濒危植物大苞山茶种群结构与动态特征

林春惠1,2, 顾惠怡1, 叶钦良3, 张志坚3, 钟智明3, 易绮斐1,2,*()   

  1. 1中国科学院华南植物园, 广东省应用植物学重点实验室, 广州 510650
    2仲恺农业工程学院, 广州 510225
    3广东省紫金白溪省级自然保护区管理处, 广东紫金 517400
  • 收稿日期:2022-12-05 接受日期:2023-07-06 出版日期:2023-12-20 发布日期:2023-07-06
  • 通讯作者: *(yiqifei@scbg.ac.cn)
  • 基金资助:
    广东省重点领域研发计划(2022B1111040003);广东省林业科技计划(202006012)

Characteristics of population structure and dynamics in endangered Camellia granthamiana

LIN Chun-Hui1,2, GU Hui-Yi1, YE Qin-Liang3, ZHANG Zhi-Jian3, ZHONG Zhi-Ming3, YI Qi-Fei1,2,*()   

  1. 1Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
    2Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
    3Guangdong Zijin Baixi Provincial Nature Reserve Administrate Office, Zijin, Guangdong 517400, China
  • Received:2022-12-05 Accepted:2023-07-06 Online:2023-12-20 Published:2023-07-06
  • Contact: *(yiqifei@scbg.ac.cn)
  • Supported by:
    Supported by Research and Development Program in Key Areas of Guangdong Province(2022B1111040003);Forestry Science and Technology Project of Guangdong Province(202006012)

摘要:

探讨大苞山茶(Camellia granthamiana)的野外种群结构, 揭示大苞山茶种群的更新过程及发展趋势, 可为其保护及可持续利用提供科学依据。该研究以广东省紫金县内的两个大苞山茶种群作为研究对象, 通过编制静态生命表, 计算数量动态指数, 绘制存活曲线和种群生存力函数曲线, 并采用种群数量时间序列预测的方法对大苞山茶种群的结构和动态特征进行分析。主要结果如下: 1)两个大苞山茶的种群均为幼龄个体占比高的金字塔型结构, 鹿子嶂种群和杨梅坝种群的幼龄个体(I、II龄级)分别占总数的71.48%、64.32%, 但幼苗死亡率高; 2)两个种群的存活曲线均趋近于Deevey-II型, 说明大苞山茶各龄级死亡率基本相同; 3)两个种群在忽略外部干扰时的数量动态指数(Vpi)和考虑外部干扰时的数量动态指数(V′pi)均大于0, 而V′pi趋近于0, 属于不稳定的增长型种群, 其中, 杨梅坝种群的稳定性相对较好; 4)生存函数分析表明, 两个种群的生存率和累计死亡率在I、II龄级达到了平衡, V龄级后生存曲线变化幅度变小, 有限的个体开始进入生理衰退期; 5)时间序列预测的结果为: 在经历未来2、4、6、8龄级后, 每个龄级的个体数量均有不同程度的增加。综上所述, 大苞山茶种群幼龄个体死亡率高, 但仍有一定的更新潜力。野外调查中发现人为干扰对大苞山茶种群的影响较大, 应避免人为砍伐破环, 同时对幼苗进行迁地或就地保护, 提高幼苗存活率。

关键词: 大苞山茶, 种群结构, 静态生命表, 生存函数, 时间序列预测

Abstract:

Aims The study investigated the population structure of wild Camellia granthamiana, and examined its regeneration processes and grwoth development, for purpose of guiding conservation and sustainable utilization of the species.
Methods The structure and dynamics of two populations of C. granthamiana in Zijin, Guangdong, were studied with a static life table, dynamic indices, survival curves, population function curves, and the method of time sequence prediction.
Important findings 1) The two populations of C. granthamiana displayed pyramidal structures with high proportion of young individuals; the young individuals (I to II age class) of the Luzizhang and Yangmeiba populations accounted for 71.48% and 64.32% of the total, respectively, with a high mortality rate. 2) The survival curves of the two populations tended to be in the form of Deevey-II, indicating that the mortality rates in different age classes were similar. 3) The numerical dynamic index ignoring the external interference (Vpi) and that accounting for the external interference (V′pi) are both greater than zero in the two populations, with V′pi approaching zero, suggesting unstable population growth. The Yangmeiba population was relatively more stable. 4) The survival function analysis shows that the survival rate and cumulative mortality of the two populations reached a balance between the age classes of I to II; after the age class of V, the survival curve changed slightly, and limited number of individuals began to enter the physiological decline stage. 5) It is predicted that the number of individuals in each age class will increase in different degrees after 2, 4, 6 and 8 age classes in the future. In summary, the mortality rate of young individuals in the population of C. granthamiana is high, but there is still a certain potential for renewal. In the field investigation, it was found that the human disturbance had a great impact on the population of C. granthamiana. Therefore, for conservation and sustainable utilization of the natural populations of this endangered species, cutting should be strictly prohibited, and both ex situ and in situ protections of the seedlings are advisable.

Key words: Camellia granthamiana, population structure, static life table, survival function, time sequence prediction