Population Structure and Dynamics of Pinus tabulaeformis in Lingkong Mountain of Shanxi Province

In Lingkong Mountain, one four hectare plot was established for a field investigation of Pinus tabulaeformis populations.Based on survival and spectral analysis,size structure and static life tables were constructed,the curves of survival were drawn,and the periodicity of P.tabulaeformis population was analyzed.Results showed that the individual number of seedlings and saplings of P.tabulaeformis population were more than other levels of P.tabulaeformis.While the middle level of P.tabulaeformis was relatively stable,the high level of P.tabulaeformis was significantly reduced as a result of interspecific competition and environmental factors.The estimated survival curve roughly showed the form of Deevey-Ⅱ.The P.tabulaeformis population fluctuation presented a minor but inconspicuous cycle.This showed that P.tabulaeformis development was steady.