对流层臭氧影响植物叶片光合速率的荟萃分析  

A Meta-Analysis of the Response of Leaf Photosynthesis Rate to Tropospheric Ozone

作　　者：王昱禛 袁晓雯 李芳[1] WANG Yuzhen;YUAN Xiaowen;LI Fang(International Center for Climate and Environment Sciences,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049;College of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610225)

机构地区：[1]中国科学院大气物理研究所国际气候与环境科学中心,北京100029 [2]中国科学院大学地球与行星科学学院,北京100049 [3]成都信息工程大学大气科学学院,成都610225

出　　处：《气候与环境研究》2025年第2期212-224,共13页Climatic and Environmental Research

基　　金：国家自然科学基金项目,41875137,广东省基础与应用基础研究重大项目,2021B0301030007;国家重点研发计划项目,2022YFE0106500;国家重大科技基础设施项目“地球系统数值模拟装置”。

摘　　要：对流层臭氧(O_(3))作为一种重要的大气污染物,对全球植物生长发育构成威胁,其导致的生态胁迫不仅严重阻碍了碳中和目标的实现,而且还给粮食安全带来不可忽视的挑战。光合作用是关键的植物生理过程,也是大气中的碳元素进入陆地生态系统的途径。以往关于O_(3)污染影响植物光合速率的定量研究大多仅限于1或2种植被类型、单一环境交互因子、或较短时段的分析。本研究收集整理了过去52年(1970年1月至2022年12月)公开发表,且经过严格质量控制后的1263条O_(3)熏蒸实验观测数据,通过荟萃分析(Meta-analysis)方法,全面地分析了植物光合速率对O_(3)的响应,揭示了植被类型、臭氧浓度([O_(3)])、O_(3)和其他环境因子复合作用、以及树木年龄对该响应的影响。结果表明[O_(3)]升高可使植物光合速率显著降低22.29%。不同植被类型的光合速率对O_(3)的响应不同,农作物、灌木和阔叶树最敏感,光合速率分别降低了25.82%、23.28%和22.14%,而草和针叶树响应较小,分别降低14.51%和6.70%。阔叶树和针叶树的光合速率随[O_(3)]升高先增大后减小,而农作物的光合速率随[O_(3)]的升高先减小后增大。对于O_(3)与不同天气气候和环境因子的复合作用,干旱、霜冻、增加CO_(2)、施肥、同时增加CO_(2)和施氮肥均可减轻O_(3)对植物的伤害,而当[O_(3)]≥70ppb(ppb=10-9)时,遮荫和高盐分土壤则会增加O_(3)的负面影响。此外,树木叶片光合速率对O_(3)的响应随着树木年龄的增长而增强,尤其是针叶树。我们的研究结果将为全球变化背景下O_(3)污染影响陆地植物生理生态和陆地生态系统碳收支提供重要参考。Tropospheric ozone(O_(3)),as one of the primary atmospheric pollutants,poses a global threat to plants,causing ecological stress that severely hinders the achievement of carbon neutrality goals and significantly endangers food security.Photosynthesis is a critical physiological process and a pathway for carbon to enter terrestrial ecosystems.Previously,studies focused only on one or two vegetation types,a single environmental interaction factor,or over a short period.This study compiled 1263 observations from O_(3) fumigation experiments published over the past 52 years(from January 1970 to December 2022)and conducted strict data quality control.Through meta-analysis,a comprehensive analysis was conducted on the response of the plant photosynthesis rate to O_(3),revealing the impact of the vegetation type,ozone concentration([O_(3)]),combined effects of O_(3) with other environmental factors,and tree age on this response.Our meta-analysis results show that elevated[O_(3)]significantly reduces the plant photosynthesis rate by up to 22.29%.The response of photosynthesis rates to the O_(3) variation across vegetation types is as follows.Crops,shrubs,and broadleaf trees are the most sensitive,with photosynthetic rate reductions of 25.82%,23.28%,and 22.14%,while grass and needle-leaf trees have smaller responses,decreasing by 14.51%and 6.70%,respectively.The tree photosynthesis rates increase and then decrease with rising[O_(3)],while for crops,the rate falls first and then rises.As for the combined effects of O_(3) with different environmental factors,drought,frost,elevated CO_(2) concentration([CO_(2)]),fertilization,and the simultaneous increase of[CO_(2)]and fertilization can alleviate O_(3) stress,while shading and high soil salinity will exacerbate O_(3) stress when[O_(3)]≥70 ppb.Furthermore,the photosynthetic rate of tree leaves in response to O_(3) intensifies with the increasing age of trees,particularly in the case of needle-leaf trees.Our findings provide an important reference for understanding the influ

关 键 词：臭氧 光合作用 荟萃分析 陆地生态 碳循环 

分 类 号：P464[天文地球—大气科学及气象学]