Effects of elevated ozone concentration and nitrogen addition on ammonia stomatal compensation point in a poplar clone

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	Effects of elevated ozone concentration and nitrogen addition on ammonia stomatal compensation point in a poplar clone
	Zhao, Yuanhong; Dore, Anthony J.; Yuan, Xiangyang; Xu, Yansen; Xu, Wen; Shang, Bo; Massad, Raia-Silvia; Feng, Zhaozhong
刊名	ENVIRONMENTAL POLLUTION
	2018-07-01
卷号	238 页码:760-770
关键词	Ammonia Ozone Apoplast Compensation point Forest species
ISSN号	0269-7491
文献子类	Article
英文摘要	The stomatal compensation point of ammonia (chi(s)) is a key factor controlling plant-atmosphere NH3 exchange, which is dependent on the nitrogen (N) supply and varies among plant species. However, knowledge gaps remain concerning the effects of elevated atmospheric N deposition and ozone (O-3) on chi(s) for forest species, resulting in large uncertainties in the parameterizations of NH3 incorporated into atmospheric chemistry and transport models (CTMs). Here, we present leaf-scale measurements of chi(s) for hybrid poplar clone '546' (Populusdeltoides cv. 55/56 x P. deltoides cv. Imperial) growing in two N treatments (NO, no N added; N50, 50 kg N ha(-1) yr(-1) urea fertilizer added) and two O-3 treatments (CF, charcoal-filtered air; E-O-3, non-filtered air plus 40 ppb) for 105 days. Our results showed that chi(s) was significantly reduced by E-O-3 (41%) and elevated N (19%). The interaction of N and O-3 was significant, and N can mitigate the negative effects of O-3 on chi(s). Elevated O-3 significantly reduced the light-saturated photosynthetic rate (A(sat)) and chlorophyll (Chl) content and significantly increased intercellular CO2 concentrations (Ci), but had no significant effect on stomatal conductance (g(s)). By contrast, elevated N did not significantly affect all measured photosynthetic parameters. Overall, chi(s) was significantly and positively correlated with Asat, gs and Chl, whereas a significant and negative relationship was observed between chi(s) and Ci. Our results suggest that O-3-induced changes in Asat, Ci and Chl may affect chi(s). Our findings provide a scientific basis for optimizing parameterizations of chi(s) in CTMs in response to environmental change factors (i.e., elevated N deposition and/or O-3) in the future. (C) 2018 Elsevier Ltd. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/40532]
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	Zhao, Yuanhong,Dore, Anthony J.,Yuan, Xiangyang,et al. Effects of elevated ozone concentration and nitrogen addition on ammonia stomatal compensation point in a poplar clone[J]. ENVIRONMENTAL POLLUTION,2018,238:760-770.
APA	Zhao, Yuanhong.,Dore, Anthony J..,Yuan, Xiangyang.,Xu, Yansen.,Xu, Wen.,...&Feng, Zhaozhong.(2018).Effects of elevated ozone concentration and nitrogen addition on ammonia stomatal compensation point in a poplar clone.ENVIRONMENTAL POLLUTION,238,760-770.
MLA	Zhao, Yuanhong,et al."Effects of elevated ozone concentration and nitrogen addition on ammonia stomatal compensation point in a poplar clone".ENVIRONMENTAL POLLUTION 238(2018):760-770.