树木生物质对臭氧暴露的敏感性:十年的自由空气实验的见解
Annesha Ghosh1, Andrea Viviano2,3, Elena Paoletti2,4
1Department of Life Science, School of Natural Sciences, Central University of Jharkhand, Ranchi, Jharkhand, India.
Global change biology
|January 29, 2026
概括
热带层臭氧 (O3) 减少森林生物质,落叶物种比常青植物更敏感. 根是最容易受到臭氧损害的植物部位,影响碳分配策略.
科学领域:
- 环境科学 环境科学
- 植物生理学 植物生理学
- 森林生态 森林生态
背景情况:
- 热带层臭氧 (O3) 是一种主要的空气污染物,对森林生态系统产生负面影响.
- 臭氧暴露会影响植物生物质,碳分配和森林的整体健康.
- 了解物种对臭氧的特定反应对于预测森林生态系统变化至关重要.
研究的目的:
- 评估臭氧 (O3) 对 17 种木质 taxa 的生物质分配的影响,使用自由空气受控暴露 (FACE).
- 为了比较基于流量的指标在量化臭氧诱导的生物质减少的有效性.
- 调查落叶物种和常青物种之间臭氧敏感性和碳分配策略的差异.
主要方法:
- 利用了17种木质物种十年的自由空气受控暴露 (FACE) 数据.
- 分析了与臭氧吸收 (植物毒臭氧剂量,POD1) 相关的生物质反应 (总量,地表,地下).
- 评估的基于流量的指标,包括叶子指数流量 (LIF),以及它们与碳分配比率的相关性 (芽与根比率,S/R;叶面积比率,LAR).
主要成果:
- 随着臭氧吸收 (POD1) 的增加,观察到持续的生物质减少 (RTB,RTAB,RTBB).
- 与常青物种相比,落叶物种表现出较低的值 (CL4) 和较小的臭氧吸收增量 (ΔPOD1) 来减少生物质.
- 臭氧暴露改变了碳分配,在落叶物种中POD1/LIF和S/R之间存在负相关性,在常青植物中与LAR和S/R之间存在正相关性.
结论:
- 基于流量的指标有效量化了臭氧诱导的生物质损失,在叶物种中显示出更高的敏感性.
- 地下生物质 (根) 是对臭氧暴露最脆弱的组成部分.
- 叶子习惯在臭氧压力下影响碳分配策略,需要在生态模型中考虑特定物种.
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