2013-2018年武夷山亚热带常绿阔叶林乔木层动态

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 2013-2018年武夷山亚热带常绿阔叶林乔木层动态 DOI: 10.5846/stxb202007051746 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 中央级公益性科研院所基本科研业务专项（GYZX200203）；生态环境部生物多样性保护重大工程（ZDGC2019-007-04）；中央级科学事业单位修缮购置专项（2060503） Dynamics of arbor layer in the Subtropical Evergreen Broad-leaved Forest in the Wuyi Mountains, Fujian Province, southeastern China in 2013-2018 Author: Affiliation: Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:从植物群落组成和结构的角度研究森林群落的演替规律，是探究森林群落的退化与恢复过程及相关机制的重要途径，对于指导天然林保护和恢复具有重要理论价值和实践意义。2018年，对面积为9.6 hm2的武夷山亚热带常绿阔叶林样地进行了第2轮调查，并从重要值、物种多度、物种丰富度、Shannon-Wiener多样性指数、Simpson指数、Margalef丰富度指数、Pielou均匀度指数、死亡率、补员率、种群大小变化率、相对适合度、胸径变异系数等角度分析了乔木层群落动态。结果表明：2018年的乔木个体为48科88属174种，较2013年增加了1种。Margalef丰富度指数上升，Shannon-Wiener多样性指数、Simpson指数、Pielou均匀度指数均略有下降。DBH≥1 cm的乔木个体从68336个减少到63897个，共死亡7430个个体，补员2991个个体。群落的年死亡率为2.30%，年补员率为0.96%，种群大小变化率为-1.34%，相对适合度为0.42。群落的平均胸径从5.02（±0.02） cm上升为5.49（±0.03） cm。28个重要值之和由71.92%下降为71.81%，年死亡率为2.46%，年补员率为0.79%，种群大小变化率和相对适合度分别为-1.67%和0.46。物种数增加和群落总个体数下降对Margalef丰富度指数的上升产生直接影响。常见种减少，稀有种增加，预示着一般性扰动会给常见种的种群带来更大的影响。建落种或优势种的缺乏且许多物种优势程度接近，可能使处于同一林冠层的树种对光照等资源的激烈竞争产生导致的高死亡率和低补员率。赤杨叶（Alniphyllum fortunei）、木荷（Schima superba）等阳生树种的种群更新困难可能意味着群落发生了有利于中生和阴生树种的变化。 Abstract:Studying the forest community succession by understanding the characteristics of plant community composition and structure is an important way to explore the degradation and restoration processes, as well as the related mechanisms of forest communities. The study also has important theoretical and practical significance for guiding the conservation and restoration of natural forests. In 2018, relevant data was gathered by the second investigation in the Subtropical Evergreen Broad-leaved Forest plot with an area of 9.6 hm2 in the Wuyi Mountains, Fujian Province, southeastern China. Community dynamics of arbor layer was analyzed based on the perspectives of importance value, species abundance, species richness, Shannon-Wiener Index, Simpson Index, Margalef Index, Pielou Index, mortality rate, recruitment rate, rate of population size change, fitness, and coefficient of diameter at breast height (DBH) variation. The results showed that the community of trees was 48 families, 88 genera, 174 species in 2018, which increased by 1 species compared with 2013. Margalef Index rose, while Shannon-Wiener Index, Simpson Index and Pielou Index declined in the past 5 years. The tree individuals with DBH ≥ 1 cm was reduced from 68336 to 63897, with 7430 dead, and 2991 recruited individuals. Annual mortality rate, annual recruitment rate, rate of population size change, and fitness of the community were 2.30%, 0.96%, -1.34%, and 0.42, respectively. The average DBH of all trees in this community increased from 5.02 (±0.02) cm to 5.49 (±0.03) cm. The total of importance value for the 28 common tree species with higher importance value (>1%) decreased from 71.92% in 2013 to 71.81% in 2018. Annual mortality rate, annual recruitment rate, rate of population size change, and fitness for these common species were 2.46%, 0.79%, -1.67% and 0.46, respectively. The increase of species number and decrease of total tree individuals of community caused a direct impact on the increase of Margalef Richness Index. The decrease of common species and the increase of rare species indicated that the general disturbance would have a greater impact on the population of common species. The lack of constructive species or dominant species and the close dominance of many species may lead to high mortality rate and low recruitment rate of tree species in the same canopy layer for some resources such as light. The difficulty of population regeneration of sun plants such as Alniphyllum fortune, Schima superba may mean that the community has changed in favor of medium and shade plants. 参考文献 相似文献 引证文献