摘要
为了研究小兴安岭山杨种群动态和数量特征,以种群生命表及生存分析理论为基础,编制山杨种群静态生命表,绘制存活曲线、死亡率曲线、损失度曲线、死亡密度函数曲线、积累死亡函数曲线和危险率函数曲线,分析种群生命过程。结果表明:山杨种群幼年个体丰富,中老年个体相对较少,种群在第Ⅴ龄级出现死亡高峰,种群存活曲线属于Deevey-Ⅱ型,山杨种群目前表现为增长型种群。在自然条件下,当山杨胸径达到18 cm左右时,应对其进行抚育管理以提高木材利用率。
In order to study the population dynamic and quantitative characteristics of P. davidiana Population in Xiaoxing＇anling, a static life table of P. davidiana was worked out and the curves of survival, mortality rate, lose rate mortality densityfunction, cumulative mortality function, as well as risk rate function were drawn based on the life table of population and the theory of survival analysis. Meanwhile, the life process of P. davidiana population was analyzed. The results showed that the number of young individuals was larger than that of mid - and old - individuals. The population had one peak of mortality in size class V. The survival curve of the population belong to the Deevey - II type. At present the population were rise type. The tending management should be actualized to increase the timber utilization quotiety when the DBH of P. dav/d/ana individual reached to around 18cm in natural conditions.
出处
《林业科技》
2010年第2期15-18,共4页
Forestry Science & Technology
关键词
小兴安岭
山杨
生命表
生存分析
Xiaoxing＇anling
Populus Davidiana
Life table
Survival analysis
