小陇山国家级自然保护区华山松种群更新动态分析

摘要

以种群生命表及生存分析理论为基础,将林木依胸径大小分级,以林木径级结构代替年龄结构,采用分段匀滑技术编制小陇山国家级自然保护区华山松种群静态生命表,对其种群年龄结构、死亡率曲线、损失度曲线、存活曲线、生存函数曲线及其幼苗的更新动态、死亡率和原因进行分析.结果表明:该种群属于增长型,表现出前期增长,中期稳定,后期衰退的特点;该种群的整个生命过程,显示了三次死亡高峰,其中幼苗死亡率较高,以后的死亡率低而平缓,符合种群的自然动态规律,也指出"天保工程"实施的意义和效果;该研究指示了华山松的动态以及种群的变化趋势,对保护区已经实施的生态监测和森林保护有着十分重要的意义.%The static life table of Pinus armandii population in the Xiaolongshan Nature Reserve in Gansu was compiled based on the population life table and theory of survival analysis using the size class structure represented by DBII class and smoothing out technique. The size class structure, curves of mortality rate, vanish rate,survival function of the P. armandii, as well as the regeneration dynamics, mortality and causes of seedling were analyzed. The results were as follows: P. armandii population size class structure were developing, characterized early growth, medium stability and later recession; the whole life process of the population had demonstrated three death peaks,of which the mortality of seedlings coming to be low and stable later, was relatively high. Consistent with the natural dynamic rule of populations, it also showed the significance and effect of "Natural Forest Protection Project"; the study indicated the dynamic and change trends of P. armandii population were crucial for both the ecological monitoring and the for-est protection applied in the reserve.