极小种群野生植物细果秤锤树种群结构与动态特征

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 极小种群野生植物细果秤锤树种群结构与动态特征 DOI: 10.5846/stxb202104291124 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 浙江省珍稀濒危野生动植物抢救保护行动(2021-2025);基于功能群的亚热带次生阔叶林质量提升技术研究与示范(2019SY08) Population structure and dynamic characteristics of an extremely small population plant Sinojackia microcarpa Author: Affiliation: Fund Project: Zhejiang Provincial Action for the Rescue and Protection of Rare and Endangered Wild Animals and Plants (2021-2025);Study and demonstration on quality improvement technology of subtropical secondary broad-leaved forest based on functional group (2019SY08) 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:细果秤锤树(Sinojackia microcarpa)是中国特有极小种群植物之一,属国家Ⅱ级重点保护植物。为揭示该种群的生存潜力与濒危机制,为种群保护提供依据,采用样地调查法在浙江省建德市细果秤锤树自然集中分布区进行野外调查,以空间代替时间研究了细果秤锤树种群的结构特征,绘制了种群静态生命表及种群存活曲线,并应用种群动态和时间序列量化预测种群未来发展态势。结果表明:(1)细果秤锤树的径级、高度和冠幅结构均表明该种群龄级结构总体呈衰退型,种群幼年树淘汰率较高,中年树到老年树过渡阶段适应力增强,生长情况较前期稳定。(2)生活曲线属Deevey-Ⅲ型,早期死亡率高,生存分析揭示细果秤锤树种群具有前期锐减的动态特征。(3)时间序列分析预测在未来2、4、6、8个龄级后,细果秤锤树的年龄结构存在幼年个体数下降,中、老年树占优势的衰退风险。(4)种群动态指数表明该种群结构总体波动大,抗外界干扰能力较弱,环境对个体的选择作用较强。为促进种群自然更新,应加强就地保护措施,降低人为干扰对个体生存环境的威胁,提高幼苗至幼树转化率,实现种群恢复。 Abstract:Sinojackia microcarpa is one of the extremely small populations species in China, it is a level-Ⅱ national key protected plant. To reveal the survival potential and endangered mechanism of the population, and provide the basis for population protection, a sample survey was conducted in the natural concentrated distribution area of S. microcarpa in Jiande City, Zhejiang Province. The structural characteristics of S. microcarpa were studied in space instead of time, the population static life table and population survival curve were drawn, and the population dynamics and time series were used to quantitatively predict the future development trend of the population. The results showed that: (1) The structure of diameter, height and crown structure all indicated that the age structure of the population was generally declining, the young trees had high mortality, while the adaptability of the adult tree to the old tree was enhanced, and the growth situation was stable compared with the previous period. (2) The life curve belonged to the Deevey-Ⅲ type, survival analysis showed that the population of S. microcarpa had a sharp decline in the early stage and the early mortality rate was high. (3) Time series analysis predicted that after 2, 4, 6, and 8 age classes in the future, the number of young individuals of S. microcarpa will decline, and the age structure will be in a decline dynamic where adult trees dominate. (4) The population dynamic index indicated that the overall structure of the population fluctuated greatly, the ability to resist external interference was weak, and the environment had a strong effect on individual selection. In order to promote the natural renewal of the population, in-situ protection measures should be strengthened to reduce the threat of human interference to the individual living environment, it will help increase the conversion rate of seedlings to saplings, and achieve the restoration of population. 参考文献 相似文献 引证文献