The Population Structure and Dynamics of Davidia involucrata——A Case Study of Heizhugou National Nature Reserve
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摘要: 为了解四川省黑竹沟国家级自然保护区珙桐未来的发展趋势,探讨其致危主要因子,为珙桐的保护和恢复提供理论参考。通过对四川省黑竹沟珙桐种群进行研究,运用绘制珙桐分布图、种群结构图、静态生命表、存活曲线以及时间序列模型等方法来揭示珙桐种群结构和动态特征。结果显示,该种群径级结构与高度结构变化趋势相似,近似纺锤型,幼苗、幼树和老龄个体数量较少,该种群发展主要靠中龄个体维持。种群标准存活曲线为Deevey I型,即凸型,属于下降型种群;种群个体死亡率与个体损失度走向基本一致,表现为前后期脆弱,中期稳定的特征。时间序列预测表明:在未来5年后,现存个体存活总数将呈现明显减少的趋势。该地区幼苗主要以萌生为主,实生苗罕见;研究表明,该种群属于下降型种群,并处于快速衰退阶段,随着时间的推移,会出现严重的老龄化问题。种子自然更新力差成为该种群发展最严峻的问题。根据研究结果,提出了保护策略。Abstract: To understand the future development trend of the population, the main endangered factors were discussed for Davidia involucrata in Heizhugou National Nature Reserve, and some theoretical references were provided for the protection and restoration. The population structure and dynamics of D. involucrata were studied by plotting its distribution map, population structure map, static life table, survival curve and time series model.The hierarchical structure of the population was spindle-shaped, which was similar to that of the height structure. The number of seedlings, young trees and old individuals was small, and the development of the population depended mainly on the middle-aged individuals. The standard survival curve of the population was Deevey I type, i.e. Convex type, belonging to a descending type. The individual mortality rate and individual loss degree of the population are basically consistent, showing the characteristics of fragility in the early and late period and stability in the middle period. Time series predictions showed a significantly decrease in the total number of surviving individuals in next five years. The seedlings mainly sprouted from roots.It indicated that the population was a descending type in a rapid decline stage, which would be a serious aging problem with the passage of time,. The poor regeneration ability of seeds had become the most serious problem in the development of this population.Protection strategies were proposed according to the results of the study.
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