生态学报2018，Vol.38Issue(8)：2710-2721,12.DOI: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 characteristics and ozone dose-response relationships for six greening tree species
摘要
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 40nmol/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.关键词
臭氧/剂量/气孔特征/木本/线性关系Key words
ozone/dose/stomatal characteristics/woody species/linear relationship引用本文复制引用
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[J].生态学报,2018,38(8):2710-2721,12.基金项目
国家自然科学基金项目(31500396,41771034) （31500396,41771034）
中国科学院前沿科学重点研究项目(QYZDB-SSW-DQC019) （QYZDB-SSW-DQC019）
中国科学院“百人计划”项目 （）
