Ozone exposure- and flux-based response relationships with photosynthesis, leaf morphology and biomass in two poplar clones

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	Ozone exposure- and flux-based response relationships with photosynthesis, leaf morphology and biomass in two poplar clones
	Xu, Yansen; Shang, Bo; Feng, Zhaozhong; Li, Pin; Yuan, Xiangyang; Calatayud, Vicent
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2017-12-15
卷号	603 期号:1 页码:185-195
关键词	Ozone Dose-response Relationships Sensitivity Critical Level Poplar
英文摘要	Poplar clones 546 (P. deltoides cv. `55/56' x P. deltoides cv. `Imperial') and 107 (P. euramericana cv. `74/76') were exposed to five ozone concentrations in 15 open-top chambers (OTCs). Both ozone exposure (AOT40, Accumulation Over a Threshold hourly ozone concentration of 40 ppb) and flux-based (POD7, Phytotoxic Ozone Dose above an hourly flux threshold of 7 nmol O-3 m(-2) PLA (projected leaf area) s(-1)) response relationships were established with photosynthesis, leaf morphology and biomass variables. Increases in both metrics showed significant negative relationships with light-saturated photosynthesis rate, chlorophyll content, leaf mass per area, actual photochemical efficiency of PSII in the light and root biomass but not with stomatal conductance (g(s)), leaf and stem biomass. Ozone had a greater impact on belowground than on aboveground biomass. The ranking of these indicators from higher to lower sensitivity to ozone was: photosynthetic parameters, morphological index, and biomass. Clone 546 had a higher sensitivity to ozone than clone 107. The coefficients of determination (R-2) were similar between exposure-and flux-based dose-response relationships for each variable. The critical levels (CLs) for a 5% reduction in total biomass for the two poplar clones were 14.8 ppm h for AOT40 and 9.8 mmol O-3 m(-2) PLA for POD7. In comparison, equivalent reduction occurred at much lower values in photosynthetic parameters (4 ppm h for AOT40 and 3 mmol O-3 m(-2) PLA for POD7) and LMA (5.8 ppm h for AOT40 and 4 mmol O-3 m(-2) PLA for POD7). While in recent decades different CLs have been proposed for several plant receptors especially in Europe, studies focusing on both flux-based dose-response relationships and CLs are still scarce in Asia. This study is therefore valuable for regional O-3 risk assessment in Asia. (C) 2017 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39067]
专题	生态环境研究中心_城市与区域生态国家重点实验室
推荐引用方式 GB/T 7714	Xu, Yansen,Shang, Bo,Feng, Zhaozhong,et al. Ozone exposure- and flux-based response relationships with photosynthesis, leaf morphology and biomass in two poplar clones[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2017,603(1):185-195.
APA	Xu, Yansen,Shang, Bo,Feng, Zhaozhong,Li, Pin,Yuan, Xiangyang,&Calatayud, Vicent.(2017).Ozone exposure- and flux-based response relationships with photosynthesis, leaf morphology and biomass in two poplar clones.SCIENCE OF THE TOTAL ENVIRONMENT,603(1),185-195.
MLA	Xu, Yansen,et al."Ozone exposure- and flux-based response relationships with photosynthesis, leaf morphology and biomass in two poplar clones".SCIENCE OF THE TOTAL ENVIRONMENT 603.1(2017):185-195.