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题名: Moderate drought did not affect the effectiveness of ethylenediurea (EDU) in protecting Populus cathayana from ambient ozone
作者: Xin, Yue; Yuan, Xiangyang; Shang, Bo; Manning, William J.; Yang, Aizhen; Wang, Younian; Feng, Zhaozhong
刊名: SCIENCE OF THE TOTAL ENVIRONMENT
出版日期: 2016-11-01
卷号: 569, 页码:1536-1544
关键词: Ambient ozone ; Drought ; Ethylenediurea ; Photosynthesis ; Poplar
DOI: 10.1016/j.scitotenv.2016.06.247
部门归属: 城市与区域生态国家重点实验室
英文摘要: A field study was conducted to evaluate the effects of ambient ozone (O-3) on an O-3-sensitive poplar (Populus cathayana) by using ethylenediurea (EDU) as a chemical protectant under two soil water treatments (well-watered (WW) and moderate drought (MD, 50-60% of WW in volumetric soil water content). EDU was applied as foliar spray at 0, 300, 450, and 600 ppm. Photosynthetic parameters, pigment contents, leaf nitrogen, antioxidant capacity, growth, and biomass were measured. The 8 h (9:00-17:0) average ambient O-3 concentration was 71.7 ppb, and AOT40 was 29.2 ppm h during the experimental period (9 June to 21 September), which was high enough to cause plant injury. MD had significantly negative effects on P. cathayana, as indicated by reduced photosynthesis, growth, and biomass, and higher MDA contents. On the other hand, EDU significantly increased photosynthesis rate, chlorophyll a fluorescence, V-cmax and J(max), photosynthetic pigments, total antioxidant capacity, tree growth and biomass accumulation, and reduced lipid peroxidation, but there was no significant interaction between EDU and drought for most parameters, indicating that EDU can efficiently protect Populus cathayana against ambient O-3 and the protection was not affected by soil water contents when soil water reached moderate drought level. Among all doses, EDU at 450 ppm provided maximum protection. Comparison of EDU-treated and non-treated P. cathayana could be used as a biomarker systemin risk assessment of the effects of ambient O3 on forest health. (C) 2016 Published by Elsevier B.V.
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35626
Appears in Collections:城市与区域生态国家重点实验室_期刊论文

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