作　　者： ; ; ; ; ; ;

机构地区： 汕头市林业科学研究所

出　　处： 《生态学杂志》 2010年第10期1901-1906,共6页

摘　　要： 通过对南澳岛中华楠次生林样地的调查,从种群年龄结构、静态生命表、生存分析和时间序列预测等方面分析了中华楠种群结构和数量动态,结果表明:种群年龄结构呈"倒J型",幼苗和小树阶段个体数量多,中树和大树阶段个体数量少,表现为增长型种群。存活曲线接近Deevey-Ⅲ型,幼苗阶段死亡率高,大树阶段死亡率较低,且相对稳定。种群死亡率和消失率曲线的变化趋势相似,均出现2个高峰,最高峰出现在幼苗的第Ⅰ龄级,第2个高峰出现在中树的第Ⅴ龄级。中树第Ⅵ龄级死亡率最低,生命期望值最高。种群的生存率单调下降,积累死亡率单调上升,种群从第Ⅷ龄级开始逐渐进入生理衰退期。种群的死亡密度和危险率曲线变化趋势与种群死亡率和消失率曲线基本一致,前期和中期震荡,后期趋于稳定。对种群未来2、5和8年的时间序列预测表明:中华楠种群呈增长趋势。 A field investigation was conducted at 6 sampling plots in Nan＇ao Island of Guangdong Province to study the population structure and dynamic characteristics of Machilus chinensis. In each plot,the diameter at breast height （DBH） （or basal diameter if tree height 1.3 m） and height of each individual were measured. The field data were then analyzed from the aspects of age structure of population,static life table,survival analysis,and time series prediction. In Nan＇ao Island,the age structure of M. chinensis population was shaped as an inverse ＂J＂ ,i.e.,more individuals at seedling and sapling stages,and less individuals with mid-size （DBH=8-20 cm） and big size （DBH 20 cm）,characterized by a growing population. The survival curve of the population generally matched Deevey type Ⅲ,with the high mortality at seedling stage and lower mortality at big tree stage. The mortality and killing power curves showed similar trend,with one peak at age Ⅰ （seedlings of DBH=0-1 cm） and the other at age Ⅴ （mid-sized trees of DBH=12-16 cm）. Age Ⅵ （DBH=16-20 cm） had the lowest mortality and the highest life expectancy. The survival rate of the population decreased monotonically,while the cumulative mortality rate curve increased monotonically. The mortality density and hazard rate curves showed the similar trends to the mortality and killing power curves,i.e.,shocked at prophase and metaphase,and stabilized at anaphase. From the age Ⅷ （DBH=24-28 cm）,the population gradually entered physiological decline phase. The time series prediction for the population in the coming 2,5,and 8 years showed that M. chinensis population would have a rising tendency.

关 键 词： 种群结构 静态生命表 生存分析 时间序列预测 种群数量动态

领　　域： [生物学] [生物学]