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李品,冯兆忠,尚博,袁相洋,代碌碌,徐彦森.6种绿化树种的气孔特性与臭氧剂量的响应关系.生态学报,2018,(8).http://dx.doi.org/10.5846/stxb201705220945  
6种绿化树种的气孔特性与臭氧剂量的响应关系
Stomatal characteristic and ozone dose-response relationships for six greening tree species
投稿时间:2017-05-22  修订日期:2017-11-29
DOI: 10.5846/stxb201705220945
关键词臭氧  剂量  气孔特征  木本  线性关系
Key WordsOzone  dose  stomatal characteristics  woody species  linear relationship
基金项目国家自然科学基金(31500396, 41771034);中国科学院前沿科学重点研究项目(QYZDB⁃SSW⁃DQC019);中国科学院“百人计划”项目
作者单位E-mail
李品 中国科学院生态环境研究中心 pinli@rcees.ac.cn 
冯兆忠 中国科学院生态环境研究中心 fzz@rcees.ac.cn 
尚博 中国科学院生态环境研究中心  
袁相洋 中国科学院生态环境研究中心  
代碌碌 中国科学院生态环境研究中心  
徐彦森 中国科学院生态环境研究中心  
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摘要:
采用开顶式气室装置研究5种臭氧(O3)浓度对6种绿化树种,即杨树基因型‘546’(Populus deltoides cv. ‘55/56’ × P. deltoides cv. ‘Imperial’)和‘107’(P. euramericana cv. ‘74/76’)、白蜡(Fraxinus chinensis)、法桐(Platanus orientalis)、洋槐(Robinia pseudoacacia)、国槐(Sophora japonica)的气孔密度、开度和大小的影响。结果表明,随着O3浓度的升高,气孔密度、开度和大小均显著降低,不同树种的各项气孔特征指标之间均存在显著性差异,O3处理、树种、采样时期以及O3和树种之间、采样时期和树种之间存在显著交互作用。6种树种的各项气孔指标与O3剂量(AOT40,小时O3浓度大于40 nmol/mol的累计值)间具有显著的线性负相关关系(P<0.05),即随着O3浓度的升高而显著降低。本研究为深入研究全球环境变化背景下城市植物的叶组织结构和功能在适应大气地表 O3 浓度变化污染方面提供了理论证据。
Abstract:
Ground-level ozone (O3) is considered as one of the most phytotoxic air pollutants due to its significant damaging effect to plants. Ozone concentration is rising at a rate of approximately 0.5-2% per year over the mid-latitudes of the northern hemisphere due to the rapid industrialization and urbanization during the last three decades. High levels of O3 occur during summertime in most parts of China, and are expected to increase further as NOX precursors are rising. Open top chambers were used to explore the stomatal characteristics (i.e., stomatal density, aperture, and size) of six greening tree species (Populus deltoides ‘55/56’ × P. deltoides ‘Imperial’, P. euramericana ‘74/76’, Fraxinus chinensis, Platanus orientalis, Robinia pseudoacacia, and Sophora japonica) in response to different O3 exposure treatments for one growing season. One-year-old seedlings of the selected species, representing a wide range of woody species used for urban greening in Beijing, showed great variation in the stomatal characteristics among the species. Generally, stomatal density, stomatal aperture, and stomatal size were all significantly decreased with increasing ozone concentrations. Specifically, there were significant differences in stomatal characteristics among the six tree species. Furthermore, there were significant interaction effects among the tree species, ozone treatments, sampling times, and their interactions. All six species showed a significant negative linear correlation (P < 0.05) between stomatal parameters and the O3 dose index AOT40 (O3 concentration increased hourly over a threshold of 40 nmol/mol during daylight hours). Among the linear relationships between the stomatal parameters and AOT40, Populus showed the maximum slope, and the order of the O3 sensitivity was Populus > P. orientalis > F. chinensis > R. pseudoacacia > S. japonica. Our results provide new evidence for research on the effects of ground-level O3 pollution on leaf tissue structure and functions of greening plants under environmental change.
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