Life Table and Survival Analysis of an Endangered Keteleeria fortunei Population
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摘要: 通过调查福州市长乐区珍稀植物油杉（Keteleeria fortunei（Murr.）Carr）种群，探讨其种群生命表和生存曲线，研究油杉种群数量动态变化。结果表明：长乐市油杉种群中树个体数最多，大树其次，幼树最少。油杉种群存活曲线为凹型曲线，属Deevey Ⅲ型，表现为衰退型种群。油杉种群的个体死亡率和种群消失率曲线变化趋势相似，表现为油杉种群早期死亡率较高，生长到Ⅵ龄级时，其种群死亡率呈现逐步下降趋势。油杉种群生存函数曲线表现出该种群前期数量锐减、中期种群稳定和后期种群出现衰退的特征。Abstract: Based on the field survey of Keteleeria fortunei population,a rare and valuable plant species in Changle District,Fuzhou City,the life table and survival analysis of this population were explored to study the dynamic population variation.The results showed that medium trees formed the largest K.fortunei population,followed by the large trees,while the small trees formed the smallest population in Changle City.Meanwhile,the population survival curve was a concave one,which tended to Deevey type Ⅲ,representing as a decline population.The trend of mortality rate and risk rate in K.fortunei population was basically similar.The early mortality rate of K.fortunei population was high,while the population mortality rate was relatively low at the age of VI.The population survival curve showed that the K.fortunei population decreased rapidly in early age period,stable in middle age period,and declined in old age period.
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Key words:
- Keteleeria fortune;
- Life table;
- Survival analysis;
- Rare and valuable plant
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