摘要
为了更好地了解合肥大蜀山短毛椴(Tilia breviradiata)种群的数量动态,根据对短毛椴种群的样地调查和数据统计,将林木依胸径大小分级,采用分段匀滑技术,编制其静态生命表,绘制存活曲线、死亡曲线、危险率函数和死亡密度函数曲线.结果表明:短毛椴种群以中大径级个体数量较多,幼龄级个体数量较少,种群处于成熟阶段;种群死亡趋势是生长后期高于生长前期,在Ⅶ～Ⅷ龄级的年龄阶段出现死亡率高峰,种群存活曲线趋于Deevey-Ⅰ型;短毛椴种子向幼苗的转化率低,幼苗数量较少;量化分析表明现阶段整体为稳定型种群,结构增长性很低.选择合适的恢复和保存方法促进短毛椴种子萌发和更新层个体发育是保持该种群稳定持续发展的有效途径.
In order to know the population dynamics of Tilia breviradiata in Dashu Mountain of Hefei City,the quadrat investigation was conducted on its age structure,life table and fecundity according to population structure of diameter class.A static life table of T.breviradiata was worked out and the hazard rate function,survival curve,mortality rate,as well as the function value were drawn,and the life process of the population was analyzed.The results showed that the population was stable by quantitative analysis,and most individuals concentrated in the middle and old age class,indicating that the population was in the growing and maturing stage.The survival curve of the population trended to the type of Deevey-Ⅰ,and the death rate of the population was higher in the later stage than in the former stage,and the peak of mortality was from Ⅶ to Ⅷ diameter class.The conversion rate of seed to seedling was very low,and there was in the lack of seedlings seriously.To select right rehabilitation and preservation methods for the creation of suitable habitats for the development of T.breviradiata individuals was an effective way to protect this population.
出处
《浙江大学学报（农业与生命科学版）》
CAS
CSCD
北大核心
2010年第3期341-347,共7页
Journal of Zhejiang University:Agriculture and Life Sciences
基金
合肥植物园科技创新资助项目(2008015)
关键词
短毛椴
种群数量
生命表
存活曲线
生存分析
Tilia breviradiata
population quantity
life table
survival curve
survival analysis
