贵州大沙河国家级自然保护区野生银杉种群结构和动态分析
Population Structure and Dynamic Analysis of Wild Cathaya argyrophylla in Dashahe National Nature Reserve,Guizhou,China
王林津 1杨瑞 2韩继怀 3勾伟 3赵洋洋 2高旭2
作者信息
- 1. 贵州大学林学院,贵阳 550025;贵定县林业局,贵州 贵定 551300
- 2. 贵州大学林学院,贵阳 550025
- 3. 贵州大沙河国家级自然保护区管理局,贵州 遵义 563500
- 折叠
摘要
银杉(Cathaya argyrophylla)是我国特有重点保护珍稀濒危极小种群野生植物之一,也是贵州大沙河国家级自然保护区重点保护对象和旗舰种.该研究基于 2022 年对贵州大沙河国家级自然保护区野生银杉的调查数据,计算数量动态指数、编制静态生命表、绘制存活曲线并引入生存函数和谱分析描绘其结构动态.结果表明,保护区内野生银杉种群年龄结构为倒J型,种群的动态变化指数Vpi为 39.43％,大于Vpi′且两值都大于 0,可以看出银杉种群为增长型,但增长缓慢,对外部干扰非常敏感.银杉的存活曲线属于Deevey-Ⅱ型,生存率、累计死亡率、死亡密度及危险率在Ⅰ～Ⅲ龄级变化较大,后趋于稳定.谱分析表明第Ⅲ龄级是影响银杉种群数量的主要阶段.保护区内银杉幼龄个体数多但死亡率高,是导致种群野外更新困难的主要原因,建议保护区加强银杉幼苗抚育工作,改善生存环境,从而推动银杉种群的自然更新与恢复.
Abstract
Cathaya argyrophylla is one of the endemic rare and endangered wild plant with extremely small population in China,and is also the key protected object and flagship species in Guizhou Dashahe National Nature Reserve.Based on survey data of wild C.argyrophylla in the reserve in 2022,the quantitative dynamic index was calculated,static life table was compiled,survival curve was drawn,and survival function and spectral analysis were introduced to describe its structural dynamics.The results showed that the age structure of wild C.argyrophylla population was inverted J-type,and the dynamic change index of population(Vpi)was 39.43％,which was greater than Vpi′ and both of them were greater than 0,indicating that the C.argyrophylla population was a growth type,but the growth was slow,and it was sensitive to external disturbance.The survival curve of the population belonged to Deevey-Ⅱ type,and the survival rate,cumulative mortality rate,mortality density and risk rate changed greatly in age class from Ⅰ to Ⅲ stage,and then tended to be stable.The life spectral analysis showed that the Ⅲ age class was the main stage affecting C.argyrophylla population.Therefore,the large number of young individuals and high mortality rates of C.argyrophylla in the reserve was the main reason leading to the difficulties of regeneration.It was suggested that the reserve should strengthen the care of C.argyrophylla seedlings and improve the living environment,so as to promote the natural regeneration and recovery of C.argyrophylla population.
关键词
银杉/种群结构/静态生命表/存活曲线/生存分析/谱分析Key words
Cathaya argyrophylla/Population structure/Static life table/Survival curve/Survival analysis/Spectral analysis引用本文复制引用
基金项目
贵州省科技计划项目(黔科合支撑[2020]1Y011)
贵州省林业科研项目(黔林科合[2024]06)
贵州大沙河国家级自然保护区项目(2023009390455714091-001)
出版年
2024
国家科技期刊平台
NSTL
万方数据