麻城青檀种群结构与动态分析

Structural and Dynamic Analysis of Pteroceltis tatarinowii Population in Macheng City

摘要:

为研究麻城青檀种群结构、数量和动态变化，采用样方法对种群进行调查，通过划分种群龄级并进行龄级动态分析、对种群动态进行了时间序列预测和种群Fourier级数分析，结果表明：青檀种群第3和6龄级数量减少，7龄级无存活植株，种群动态指数Vpi=22.83%，种群为增长型，但抗风险能力弱；预测种群未来高龄级植株数量增加；第3龄级为种群波动小周期。青檀种群是经过环境筛和种内种间竞争共同作用的结果；利用近自然法辅以人工优化种群的结构和功能，是保护青檀天然种群的有效手段。

Abstract:

To study the population structure quantity and dynamics trend of Pteroceltis tatarinowii in Macheng prefecture, the quadratjuxtaposing grid sampling method was used to perform an population investigation. Analyses on ageclass dynamics, time series prediction and Fourier series of the P. tatarinowii population were made, and the results showed that the number of P. tatarinowii plants in the population declined at the 3rd and the 6th age classes, with no living plant at the 7th age class; dynamic index of Vpi was 22.83%, indicating that the population was in growth, but the antirisk capacity was weak; The number of aging adult plants in the population was predicted to increase later on. The 3rd age is the minor circle of population fluctuation. The current situation of the population is the result of environmental sieve and interspecific and intraspecific competitions. Closetonature forest management together with artificial optimization of the population, is an effective approach to protect the natural P. tatarinowii population.