长白山针阔混交林不同演替阶段群落系统发育和功能性状结构

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 长白山针阔混交林不同演替阶段群落系统发育和功能性状结构 DOI: 10.5846/stxb201609141860 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 国家重点研发计划重点专项项目（2017YFC0504104）；国家自然科学基金项目（31670643） Phylogenetic development and functional structures during successional stages of conifer and broad-leaved mixed forest communities in Changbai Mountains, China 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:群落构建一直是生态学研究的热点，基于系统发育和功能性状量化生境过滤、竞争排斥以及随机过程在群落构建中的作用，能够深入理解群落构建机制。本研究以长白山针阔混交林不同演替阶段的3个5.2 hm2样地（次生杨桦林、次生针阔混交林、原始椴树红松林）为平台，基于被子植物分类系统Ⅲ（Angiosperm Classification System，APGⅢ）构建的系统发育树和7个关键功能性状（叶面积、比叶面积、叶片厚度、叶片氮含量、叶片磷含量、氮磷比、最大树高），结合环境数据，分析不同演替阶段群落系统发育和功能性状结构。研究表明：（1）各演替阶段7个植物功能性状都表现出显著的系统发育信号，表明植物功能性状受系统发育历史影响；（2）系统发育和功能性状结构在不同演替阶段和不同径级均为非随机状态。随着演替的推进群落系统发育和功能性状结构由聚集走向发散；随着径级的增加，系统发育和功能性状结构的聚集程度减小，表明随着演替阶段的进行和径级增大，竞争性排斥的作用逐渐明显；（3）各演替阶段系统发育和功能性状的周转都为非随机且不同因子对两者的解释力度存在差异。演替早期空间距离的解释力度小于环境距离，说明生境过滤在群落构建中的重要性，而在演替后期空间距离的解释力度大于环境距离，验证了扩散限制在群落构建中的重要性。 Abstract:Community assembly has long been an important issue in community ecology. By quantifying the influence of habitat filtering, competitive exclusion, and random community assembly on the phylogenetic and functional traits, ecologists would gain a deeper understanding of community construction. In this study, based on the datasets of three 5.2 hm2 permanent plots at different successional stages (i.e., a Populus davidiana-Betula platyphylla secondary forest, a secondary conifer and broad-leaved mixed forest, and a Primary Tilia amurensis-Pinus koraiensis forest), we established the phylogenetic trees according to the Angiosperm Classification System (APG Ⅲ) and seven functional traits (i.e., leaf area, specific leaf area, leaf thickness, leaf nitrogen content, leaf phosphorus content, nitrogen-phosphorus ratio, and maximum tree height). We correlated the phylogenetic trees with the environmental variables to examine the patterns of the phylogenetic and functional structures of the forest communities at different successional stages in Changbai Mountains of China. The results showed that:(1) at each successional stage, significant phylogenetic signals were found for all seven functional traits, indicating that the functional traits were influenced by the phylogenetic history. (2) Both the phylogenetic and functional structures were non-random at all successional stages and stem classes. The phylogenetic and functional structures changed from "clustered" to "overdispersed" during the succession of forest community. Meanwhile, the degree of phylogenetic and functional clustering decreased with an increase in diameter class, indicating a significant increase in competitive exclusion with the succession of forest community. (3) The phylogenetic and functional turnovers were non-random, and the explanatory ability of the factors to interpret the phylogenetic and functional turnover was different. In the early succession stage, the spatial distance explained more than the environmental distance, indicating the importance of habitat filtering in community assembly. However, in the late succession stage, the environmental distance explained more than the spatial distance, indicating the importance of dispersal limitation in community assembly. 参考文献 相似文献 引证文献