摘要
本文基于种群生命表和生存分析理论,应用"空间代替时间"的方法和匀滑技术,编制了辽河源自然保护区油松(Pinus tabuliformis)种群的静态生命表,并绘制了其死亡率曲线、消失率曲线、存活曲线以及生存函数曲线。结果表明:油松种群呈波动式的发展,经历3次死亡高峰;种群年龄结构呈倒"J"型,幼苗数量较多,但从幼苗发展到幼树(第1龄级→第2龄级)阶段需通过环境筛的高强度选择,经历第1次死亡高峰;第2次和第3次死亡高峰分别发生在油松由次林层向主林层过渡时期(第7龄级→第8龄级)和生长后期(第11龄级→第12龄级),分别是竞争导致的自疏作用和步入生理死亡年龄的结果;种群的存活曲线趋近于Deevy-II型,为稳定型种群;4个生存函数表明,种群动态具有前期减少,中期稳定,后期衰退的特点。
Based on the population life table and the theory of survival analysis, the static life table of Pinus tabuliformis population in Liaoheyuan Nature Reserve was complied by using the “spacefortime” substitution approach and the stagesmoothing technique. The graphs of mortality rate curve, killing power curve, survival rate curve, and survival function curve were also sketched. The results showed that P. tabuliformis population presented a fluctuating trend of development and would experience three death peaks. The age structure of P. tabuliformis population showed an inverted Jtype pattern and the number of seedlings was large. However, due to the high intensity selection through environmental sieve in the stage from seedling to sapling （from age class 1 to 2）, the P. tabuliformis population would experience the first death peak. The second and the third death peak occurred during the transition period from the subforest layer to the main forest layer （from age class 7 to 8） and the later stage of growth （from age class 11 to 12）, which were caused by the competitioninduced selfthinning and the physiological death, respectively. The survival curve of P. tabuliformis population was similar to the DeevyII type, thus the population was classified as a stable one. The four survival functions indicated that the population dynamics of P. tabuliformis was characterized by decreasing in the early stage, being stable in the medium stage and depressing in the later stage.
出处
《生态学杂志》
CAS
CSCD
北大核心
2017年第7期1808-1814,共7页
Chinese Journal of Ecology
基金
林业公益性行业科研专项(201204101)资助
关键词
油松
种群
静态生命表
生存分析
Pinus tabuliformis
population
static life table
survival analysis.
