【摘要】 【目的】探究武夷山国家公园脊线森林群落乔木层的种群特征，旨在保护脊线针阔混交林乔木层的生物多样性。【方法】通过对武夷山国家公园脊线森林群落固定样地的调查，从重要值(important value, IV)、物种多度、Shannon-Wiener指数(H)、种间相遇概率(probability of interspecific encounter, PIE)、Gleason丰富度指数(G)、Pielou均匀度指数(J)、生物量和坡向等方面分析了森林群落乔木层的种群特征。【结果】与2018年相比，2023年武夷山国家公园脊线样地乔木层的物种减少1个属[珍珠花属(Lyonia)],增加1个新属[厚皮香属(Ternstroemia)],种数保持不变(17科31属52种);生物量分配表现为树干>树根>树枝>树叶，总生物量呈上升趋势；物种多样性无显著差异，但东南坡与西北坡乔木层的J存在极显著差异。【结论】武夷山国家公园脊线群落内乔木层更新速率较快，胸径较小的乔木层植物死亡率高。样地内优势物种均为鹿角杜鹃(Rhododendron latoucheae)、马银花(R.ovatum)、疏齿木荷(Schima remotiserrata)和黄山松(Pinus taiwanensis),群落结构稳定。更多还原

【Abstract】 【Objective】Population dynamics in the arbor layer of mixed forests of coniferous and broad-leaved trees grown at the ridge line were surveyed and analyzed, aiming to provide theoretical value and practical significance for advancing the biodiversity of arbor layer in mixed forests and its ecology function study. 【Method】The community dynamics of forest community at the ridge line of Wuyi National Park were analyzed from the perspectives of importance value, species abundance, Shannon-Wiener index, probability of interspecific encounter, Gleason index, Pielous index, biomass and slope aspect through 2 rounds of surveys of fixed plots. 【Result】In the ridge plot of Wuyi Mountain National Park, total species number of the arbor layer remained constant, by the occurrence of Ternstroemia to offset the disappear of Lyonia, summing up to 52 species in 31 genera of 17 families. The biomass distribution followed the order of trunk > root > branch > leaf, and total biomass showed an increasing trend. There was no significant difference in species diversity, though the southeast slope and southwest slope varied significantly in Pielous index. 【Conclusion】The regeneration rate of the arbor layer at the ridge line was relatively fast, and the mortality rate of trees with small diameter at the breast height was high. The community structure was overall stable without change within short term, with Rhododendron latoucheae, R. ovatum, Schima remotiserrata and Pinus taiwanensis being the dominant species.更多还原