论文部分内容阅读
为了明晰南京灵谷寺栓皮栎种群动态特征,通过落叶阔叶混交林中栓皮栎种群样地调查,编制了种群静态生命表,并绘制其存活曲线和生存分析函数曲线,运用时间序列模型对种群的数量动态进行预测。结果表明:(1)在当前演替阶段,栓皮栎种群属于增长型,数量变化动态指数V_(pi)与V’_(pi)均大于0,存活曲线介于Deevey-Ⅰ型和Deevey-Ⅱ型之间,结合种群各龄级的统计分析及次生演替规律,说明栓皮栎种群正在由增长期向稳定期过渡,且时间序列预测表明过渡时期较长。另外,种群结构波动表明,经过强烈的环境筛选后,种群抵抗力增强,生命期望值短期内增加,死亡密度下降,种群数量稳定性提升。(2)在落叶阔叶混交林70多年的次生演替过程中,栓皮栎种群数量动态呈现出波动性变化特征,总体上趋于稳定,但幼苗幼树呈下降趋势。在今后的森林经营过程中,应人为促进栓皮栎幼苗幼树生长,保证其存活率,进而维持种群的增长与稳定,为灵谷寺落叶阔叶林可持续发展提供有利条件。
In order to clarify the population dynamics of Quercus variabilis in Linggu Temple in Nanjing, the static life table of the population was prepared from the deciduous broad-leaved mixed forest in Quercus variabilis, and the survival curves and survival analysis function curves were drawn. The time series model The number of dynamic prediction. The results showed that: (1) In the current succession stage, Quercus variabilis was a growth type. The dynamic indexes V pi and V pi were greater than 0 and the survival curves were between Deevey-Ⅰ and Deevey-Ⅱ Based on the statistical analysis and secondary succession rules of all ages, the results showed that the population of Quercus variabilis was shifting from the growth phase to the stable phase, and the time series prediction showed that the transitional period was longer. In addition, the fluctuation of population structure showed that after strong environmental screening, population resistance increased, life expectancy increased in the short term, mortality density decreased, population stability increased. (2) In the secondary succession of more than 70 years in deciduous broadleaved mixed forest, the population dynamics of Quercus variabilis showed the characteristics of fluctuating changes and generally stabilized, but the seedling saplings showed a downward trend. In the process of forest management in the future, we should artificially promote sapling growth of Quercus variabilis seedlings, ensure its survival rate, and then maintain the growth and stability of the population, providing favorable conditions for the sustainable development of the deciduous broad-leaved forest in Lingjiashan.