【摘要】 生物量是评估森林生态系统功能的关键指标,在当前全球亚热带森林生境破碎的背景下,通过探究常绿阔叶林生物量的影响机制,可为森林生态系统功能恢复提供科学依据。本研究以武夷山国家公园福建片区亚热带常绿阔叶林为研究对象,依托沿海拔梯度布设的5个0.48 ha动态监测样地2018年和2023年的调查数据,分析了5年间群落生物量及物种组成的变化,使用一般线性混合模型分析了物种多样性、结构多样性、叶功能性状和土壤元素含量与生物量之间的相关性,并使用层次分割法探究了影响生物量积累的关键因子。结果表明:（1） 5年间研究区总生物量增加62.60 t,生产力为5.22 t·ha^–1·yr^–1,其中常绿树种生产力为5.05 t·ha^–1·yr^–1（96.81%）,落叶树种为0.17 t·ha^–1·yr^–1（3.19%）。（2）研究区内重要值超过1.00%的主要树种共有25种,其中罗浮锥（Castanopsis faberi）、港柯（Lithocarpus harlandii）、峨眉鼠刺（Itea omeiensis）和窄基红褐柃（Eurya rubiginosa var.attenuata） 5年间生物量积累量减少。（3）线性混合模型结果表明,胸径标准偏差和Simpson多样性指数与生物量显著正相关（P<0.05）, Margalef物种丰富度指数和Pielou均匀度指数与生物量显著负相关（P<0.05）。（4）层次分割结果表明,结构多样性和物种多样性是影响生物量积累的主要因素,叶功能性状和土壤元素含量对生物量积累影响有限,总生物量的各影响因子中,胸径标准偏差对生物量积累贡献率最高（31.42%）,其次为Pielou均匀度指数（21.79%）。本研究结果可为亚热带常绿阔叶林生态系统修复提供指导。更多还原

【Abstract】 Aims: Biomass is an important ecological indicator because of its critical role in evaluating the function of forest ecosystems. However, global subtropical forest biotopes are facing fragmentation. We conducted a thorough inquiry into the influencing mechanism of biomass in evergreen broad-leaved forests, aiming to provide scientific insights for the functional restoration of these ecosystems in subtropical regions. Methods: We investigated the subtropical forest located in Wuyishan National Park, Fujian. Based on the inventory data collected in 2018 and 2023 from five 0.48-ha forest dynamics plots established along an elevation gradient, we analyzed the changes in biomass and species composition and the correlation between biomass and influencing factors（species diversity, structural diversity, leaf functional traits, and soil element content） using general linear mixed models. Additionally, we used the hierarchical partitioning analysis to seek the dominant factors affecting biomass accumulation. Results:（1） Over the five-year period, the total biomass in the research area increased by 62.60 t, with a productivity of 5.22 t·ha^–1·yr^–1. Evergreen species contributed 5.05 t·ha^–1·yr^–1（96.81%） to this productivity, while deciduous species accounted for 0.17 t·ha^–1·yr^–1（3.19%）.（2） There were 25 dominant tree species（importance value greater than 1.00%） identified, among which Castanopsis faberi, Lithocarpus harlandii, Itea omeiensis, and Eurya rubiginosa var. attenuate exhibited reduced biomass accumulation during the period.（3） The results of the linear mixed model revealed that a significantly positive correlations（P < 0.05） existed between biomass and both DBH standard deviation and the Simpson diversity index. Conversely, significantly negative correlations（P < 0.05） were detected between biomass and both the Margalef species richness index and the Pielou evenness index.（4） The hierarchical partitioning analysis results indicated that structural diversity and species diversity were primary drivers of biomass accumulation, while leaf functional traits and soil element content had little effect on biomass accumulation. Among all influencing factors, the contribution rate of DBH standard deviation to biomass accumulation was the highest（31.42%）, followed by the Pielou evenness index（21.79%）. Conclusion: This investigation explored the correlations between influencing factors and biomass accumulation in the evergreen broad-leaved forests of Wuyishan National Park, emphasizing that structural diversity and species diversity are paramount determinants of biomass accumulation, which can provide actionable silvicultural implications for ecological restoration of subtropical evergreen broad-leaved forest ecosystems.更多还原