关键词: 浙江楠, 种群结构, 数量动态, 极小种群, 祁门

Abstract: [Objective] The aim of the study was to understand the structure and status of endangered plant Pheobe chekiangensis and to provide a basis for the protection and ecological restoration of this plant. [Method] Based on plot investigation, static life table, quantitative dynamics of population and forecasting model of time sequence analysis were used to study the P. chekiangensis in Qimen county, Anhui province. [Results] The P. chekiangensis in Qimen county presented a pyramid-shape structure, indicating that there were a large number of seedlings and saplings and certain number of mid-size class and large-size classs trees. Life table showed that mortality rate (q_x)of I, V and VI size class was minus value, implying that lots of seedlings died in the earlier life stage. This may be accountable to its own biological characteristics and environmental factors. Expectations (e_x)maximum was in the Ⅲ size class. The survival curve was Deevey-Ⅲ. There were dramatic changes in death curve and killing curve (K_x), indicating that the complexity and instability were in the process of natural regeneration. The population dynamic index was 0.249 and 0.134, respectively, under non-interference and incompletely random interference and it deviated from 0slightly, suggesting that the population was stable and it was consistent with the results of time sequence analysis. [Conclusion] At present, the population structure of P. chekiangensis in Qimen county was relatively stable. The population recovery and development will benefit from population protection in local areas, closing hillsides to facilitate afforestation, eco-environment protection, enhancing nurturing management of seedlings, establishing gene channels, ensuring regression and introduction on condition of the gene diversity.

Key words: Pheobe chekiangensis C.B.Shang, population structure, quantitative dynamics, plant species with extremely small populations, qimen county