Abstract: 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.

Key words: Paphiopedilum barbigerum; population structure dynamics; static life table; Maolan Reserve

摘要： 小叶兜兰Paphiopedilum barbigerum为国家一级保护植物。本研究在贵州茂兰国家级自然保护区随机选定8个小叶兜兰居群进行调查，分析种群的年龄结构、静态生命表、存活与死亡率曲线，以及种群动态量化指标，探究种群结构和数量变化。结果表明，茂兰保护区小叶兜兰主要生长在海拔680～800 m区域，坡向选择上分布于东北、东南、西南方向的斜坡，小生境的岩石裸露比例超过70%。种群年龄结构为金字塔形态，呈现出增长型趋势。存活曲线接近Deevey-Ⅱ型，说明不同年龄级的死亡率趋于一致，显示出种群发展有持续稳定增长的倾向。从种群结构动态的量化指标来看，个体数量动态指数(Vx)均为正值；在无外界干扰的条件下，种群整体的年龄结构动态指数Vpi = 0.502＞0，显示出种群整体呈现年龄结构上的正增长动态；种群在受干扰时的年龄结构动态指数Vpi' = 0.024＞0，远小于Vpi且趋于零，种群结构趋向于稳定型。

关键词: 小叶兜兰；种群结构动态；静态生命表；茂兰保护区