关键词: 水稻, 水稻, 群体质量, 产量

Abstract:

Quercus variabilis is one of the main vegetation edificators in Takuanhe Nature Reserve. Study on its population dynamics is of great implications for the biodiversity conservation and restoration and ecological system balance maintenance in the area. The research showed the Quercus variabilis population is growing with tree age less than 40 years and in the developing stage from young to middle age by the analysis of diameter level structure and the relationship between tree height and diameter. The increment and decrement processes were indicated from the static life table analysis of the population, clearly showing that the selective cutting as mine poles occurred 20 years ago had a prolonged impact on the population dynamics. The impacts on the diameter levels V and VI were indicated as abnormal increase of survivorship, negative values of mortality and decrease of mean life expectance whereas the impacts on the diameter levels III and IV were opposite to the levels V and VI. The survivorship curve of the Quercus variabilis population was fit with Deevey II. Great influence of human disturbance was also reflected by the abnormal waving of the mortality curve. It is suggested prohibition from human disturbance is necessary to protect and restore the Quercus variabilis population.