南京仙林地区次生林马尾松种群结构分析  

Analysis of the Population Structure of Pinus massoniana Secondary Forest in Xianlin District of Nanjing City

作　　者：谢春平[1] 

机构地区：[1]南京森林警察学院物证鉴定中心,南京210046

出　　处：《四川农业大学学报》2012年第2期156-160,共5页Journal of Sichuan Agricultural University

基　　金：国家林业公益性行业科研专项(201004094)

摘　　要：【目的】更好地了解城市边缘马尾松种群的结构与现状。【方法】在样方调查数据的基础上,利用静态生命表、种群数量动态变化量化指数、时间序列预测模型等方法,对南京仙林地区马尾松种群进行了研究。【结果】结果表明,马尾松种群径级结构为纺锤形,幼树幼苗少,中间径级立木成维持种群发展的核心部分。生命表数据表明死亡率(qx)在Ⅵ径级前基本为负值,说明大量的幼树幼苗在前期死亡;目前,该马尾松种群的Deevey存活曲线为Ⅲ型,说明在生活史的各个时期,种群的存活率相差很大。存活率曲线、死亡曲线和致死率曲线均有较大幅度的变化,种群自然更新过程存在明显的周期性。种群结构动态指数在有干扰和无干扰情况下分别为0.264和0.300,偏离0的程度低。【结论】虽然目前依靠中等径级立木维持稳定的种群结构,但结合时间序列预测数据考虑,该种群为衰退种群。马尾松作为亚热带次生林的过渡种群,其种群的衰退与被其他物种替代,为正常现象;但地处城市边缘人为强烈干扰的存在,使得这一进程加速。[Objective] To understand the structure and status of Pinus massoniana Lamb popula- tion in Xianlin district of Nanjing. [Method] Based on plot investigation, static life table, quanti- tative dynamics of population and forecasting model of time series were used to study the P. mas- soniana population. [Results] The size class structure ratio of P. massoniana was spindle-shape, indicating that seedlings and saplings were few and mid-class stumpage was the core of the whole population. Life table showed that mortality rate （qx） was minus value above VI size class, impl- ying that lots of seedlings died in the earlier life stage. Current survival curve was Deevey-Ⅲ, suggesting that population survival rates were different at each period of life history. There were dramatic changes in survival curve, death curve and killing curve, indicating that an obvious peri- odic fluctuation was in the process of natural regeneration. The values of population dynamic in- dex were 0. 264 and 0. 300, respectively, under disturbance and not-disturbance and it deviated from 0 slightly. [Conclusion] Although the population structure was steady based on the mid- class stumpage, taking the time sequence model into consideration it was still a declining popula- tion. As a transition population in the subtropic secondary forest, it was a normal phenomenon that the population is substituted or declining. However, this process might be accelerated be- cause of the strong artificial disturbance in edge of the city.

关 键 词：马尾松 种群结构 次生林 城市边缘 

分 类 号：S792.18[农业科学—林木遗传育种]