藏东木本植物群落功能性状分布与环境的关系

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 藏东木本植物群落功能性状分布与环境的关系 DOI: 10.5846/stxb202205071265 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 科技部第二次青藏高原综合科学考察研究（2019QZKK0301）；国家自然科学基金（31860123，31560153） Functional traits of woody plants along the environmental gradients in eastern Tibet 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:研究植物群落功能性状间的相关关系及其对环境变化的响应，能够有效揭示植物功能性状的权衡模式及其对环境的适应策略。藏东昌都地区位于横断山脉西北部，复杂气候地貌孕育了丰富的植物资源，是青藏高原森林灌丛生态系统主要组分和国际生物多样性保护的热点地区。以藏东森林灌丛群落优势木本植物为研究对象，在大量野外调查基础上，采用相关分析、主成分分析、线性回归和方差分析等方法，研究了该区域植物功能性状间的相关关系、功能性状对环境变量的响应规律以及功能性状的变异来源。结果表明：（1）藏东木本植物表现出适应高寒环境的性状权衡模式，即：比叶面积、叶体积较小而叶干物质含量较大，叶磷含量和叶钾含量协同变化；（2）海拔和气候变量共同驱动着藏东木本植物功能性状的变化，并且藏东木本植物倾向于采取"高投入-慢回报"提高御寒能力的保守型适应策略；（3）海拔是影响藏东植物功能性状变异最显著的环境变量，种间变异在藏东植物群落功能性状随环境变化中起主要作用。研究结果揭示了藏东木本植物功能性状的权衡模式及其对高寒环境的适应策略，有助于加深对藏东自然植物资源分布规律和生态功能的认识，为区域生态系统功能和生物多样性保护提供科学依据。 Abstract:Examining the relationships between functional traits of plant communities and their responses to environmental changes can effectively reveal the trade-off patterns of plant functional traits and their adaptation strategies to the environment. The Qamdo region is located in the northwest of the Hengduan Mountains in eastern Tibet. The complex climate and topography have fostered an abundance of plant resources. It is the main component of the Qinghai-Tibet Plateau forest and shrub ecosystem and a hot spot for international biodiversity conservation. Based on a large number of field investigations, we tested the correlation between plant functional traits, the variation of functional traits with environmental variables, and the sources of variation in functional traits of the dominant woody plants in the forest and shrub community of eastern Tibet using correlation analysis, principal component analysis (PCA), linear regression, and variance analysis. The results showed that:(1) The woody plants in eastern Tibet exhibited a trade-off pattern of adaptation to the high cold environment, characterized by a small specific leaf area (SLA) and leaf volume (LV), a high leaf dry matter content (LDMC), and a synergetic variation between leaf phosphorus content (LNC) and leaf potassium content (LKC). (2) Elevation and climate variables are the primary drivers of variation in functional traits of woody plants in eastern Tibet, and woody plants in eastern Tibet tend to adopt a conservative adaptation strategy of "high input-slow return" to improve their cold resistance. (3) Elevation is the most significant environmental variable influencing the variation of plant functional traits in eastern Tibet. The interspecific variation explains the majority of the total variation in functional traits with the environment in eastern Tibet. The results of this study reveal the trade-off patterns of functional traits of woody plants in eastern Tibet and their adaptation strategies to the high cold environment, which contributes to a better understanding of the distribution pattern and ecological function of natural plant resources in eastern Tibet, and provides a scientific basis for regional ecosystem functional and biodiversity protection. 参考文献 相似文献 引证文献