茂兰喀斯特森林小叶兜兰种群结构和数量动态分析OA

Paphiopedilum barbigerum was listed as a national level to protect plants.The purpose of this study aimed to investigate the population structure and quantity changes of P.barbigerum.Eight populations were randomly selected in Maolan National Nature Reserve of Guizhou Province for detailed statistics and analysis,and to analyze the population age structure,static life table,survival and mortality curves,and population dynamic quantitative indicators.The results showed that P.barbigerum mainly grew at an altitude range of 680 m to 800 m in Maolan National Reserve,and the slope direction was selected to distribute in the east,southeast,south and southwest slopes,especially in the south slope,where the proportion of rock exposed in small habitats exceeds 70%.The age structure of the population was pyramidal,showing a growing trend.The survival curve was close to Deevey-Ⅱ type,which indicated that the mortality of different age groups tended to be consistent,indicating that the population development had a tendency to continue to increase steadily.From the quantitative indicators of population structure dynamics,the dynamic index of individual number(Vx)were all positive,indicating that under the condition of no external interference,the active index of age structure of the whole population(Vpi)was 0.502＞0,indicating a positive increase in age structure of the whole population.When the population was disturbed,the active index of age structure(Vpi')was 0.024＞0,which was much smaller than Vpi and tended to zero,and the population structure tended to be stable.