小陇山国家级自然保护区油松种群更新及生存

以种群生命表及生存分析理论为基础,以林木径级结构代表年龄结构,采用分段匀滑技术,编制小陇山自然保护区油松种群特定时间生命表,绘制死亡率曲线、消失率曲线、存活曲线、生存函数曲线,分析种群数量动态特征,并对其年龄跟胸径进行线性回归。结果表明:1.油松种群年龄结构表现为稳定型。2.油松种群死亡率和消失率曲线变化趋势基本一致,存活曲线趋于Deevey-Ⅱ型。4个生存函数曲线表明,油松种群具有前期稳定、中后期锐减和末期衰退的特点。3.油松年龄与其胸径线性相关。

The Regeneration and Survival of Pinus tabulaeformis Carr. Population in Xiaolongshan Nature Reserve

The static life table of Pinus tabulaeformis Carr.populations in the Xiaolongshan Nature Reserve in Gansu was compiled based on the population life table and theory of survival analysis using the age class structure represented by DBH class and smoothing out technique.The survival rate curve,the mortality rate curve,vanishing rate curve and survival function curve were determined,Analysis of population dynamics.And DBH and its age,with linear regression analysis.The results showed:1.Pinus tabulaeformis Carr.population Age structure were stable;2.Pine mortality and disappearance rates of population trends are basically the same curve.and the survival curve of the populations was Deevey type Ⅱ,Four survival functional curves showed that the Pinus tabulaeformis Carr.populations grew stably at young stage,decreased very quickly at mature stage and declined at old stage;3.The age and DHB of Pinus tabulaeformis Carr.are linear regression.