福建东山岛海岸带潺槁树种群生命表分析

Analysis of life table of Litsea glutinosa population on the coast in Dongshan Island

关键词:  潺槁树  种群  生命表  存活曲线

Key words:  Litsea glutinosa  population  life table  curves of survival rate

摘要:

为揭示海岸带天然植被中潺槁树种群生命过程,对东山岛海岸带风积沙地潺槁树林进行调查和数据统计,通过编制种群生命表,绘制存活曲线、死亡率曲线、亏损度曲线、死亡密度函数曲线、积累死亡函数曲线和危险率函数曲线,分析了其种群的年龄结构。结果表明,该种群的年龄结构呈反J分布型、属于增长型种群。其存活曲线介于Deevey-Ⅱ型和Deevey-Ⅲ型之间,呈现2个死亡高峰。4个生存函数值(生存率、积累死亡率、死亡密度、危险率)均说明该种群具有前期增长、后期稳定的特点。潺槁树是南亚热带季风常绿阔叶林优势种之一,对土壤、光的适应性强且生长迅速的一种优良前顶极种。研究结果对海岸带天然植被的恢复和重建提供了早期研究基础。

Abstract:

In order to reveal the life process of Litsea glutinosa population in the natural vegetation of coast zone,the aeolian sand L.glutinosa forest on coast of Dongshan Island was investigated. Based on data statistic,the age structure of L.glutinosa population with the static life table,the curves of survival rate,mortality rate,killing value,mortality density function,cumulative mortality rate,hazard rate function were analyzed. The results showed that the age structure of this population appeared to distribute in an inversed J shape and was at the up-growth stage. The survival curve of the population was between Deevey Ⅱ and Deevey Ⅲ with two peaks of mortality rate. Four functions(survival rate,mortality rate,mortality density function,hazard rate )all indicated that the population increased at the early stage and kept stable at the late stage. L.glutinosa is one of the species dominating the southern subtropical evergreen broad-leaved forest. L.glutinosa is well adapted on soil and light,with fast growth speed,which is an excellent preclimax species. The results provided fundamental data for the restorationand re-establishment of coast natural vegetation at the early research stage.