Water stress rather than N addition mitigates impacts of elevated O-3 on foliar chemical profiles in poplar saplings

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	Water stress rather than N addition mitigates impacts of elevated O-3 on foliar chemical profiles in poplar saplings
	Li, Zhengzhen; Yang, Jian; Shang, Bo; Xu, Yansen; Couture, John J.; Yuan, Xiangyang; Kobayashi, Kazuhiko; Feng, Zhaozhong
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2020-03-10
卷号	707 页码:1-9
关键词	Phytochemistry Poplar plantation Air pollution Drought Nutrient availability Chemical defenses
ISSN号	0048-9697
英文摘要	Tropospheric ozone (O-3) pollution can alter tree chemical profiles, and in turn, affect forest ecosystem function. However, the magnitude of these effects may be modified by variations in soil water and nutrient availability, which makes it difficult to predict the impacts of O-3 in reality. Here we assessed the effects of elevated O-3 alone, and in combination with soil water deficit and N addition, on the phytochemical composition of hybrid poplar (Populus deltoides cv. '55/56' x P. deltoides cv. 'Imperial'). Potted trees were grown in open-top chambers (OTCs) under either charcoal-filtered air or elevated O-3 (non-filtered air +40 ppb of O-3), and trees within each OTC were grown with four combinations of water (well-watered or water deficit) and nitrogen (with or without N addition) levels. We found that elevated O-3 alone stimulated the accumulation of foliar nitrogen, soluble sugar, and lignin while inhibiting the accumulation of starch, but had limited impacts on condensed tannins and salicinoids in poplar saplings. Graphical vector analysis revealed that these changes in concentrations of nitrogen, starch and lignin were due largely to altered metabolic processes, while increased soluble sugar concentration related mainly to decreased leaf biomass in most cases. The effects of O-3 on poplar foliar chemical profiles depended on soil water, but not soil N, availability. Specifically, O-3-mediated changes in carbohydrates and lignin were mitigated by decreased soil water content. Taken together, these results suggested that nitrogen acquisition, carbohydrates mobilization and lignification play a role in poplar tolerance to O-3. Moreover, the impacts of elevated O-3 on phytochemistry of poplar leaves can be context-dependent, with potential consequences for ecosystem processes under future global change scenarios. Our results highlight the needs to consider multifactors environments to optimize the management of plantations under changing environments. (C) 2018 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/44515]
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	Li, Zhengzhen,Yang, Jian,Shang, Bo,et al. Water stress rather than N addition mitigates impacts of elevated O-3 on foliar chemical profiles in poplar saplings[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2020,707:1-9.
APA	Li, Zhengzhen.,Yang, Jian.,Shang, Bo.,Xu, Yansen.,Couture, John J..,...&Feng, Zhaozhong.(2020).Water stress rather than N addition mitigates impacts of elevated O-3 on foliar chemical profiles in poplar saplings.SCIENCE OF THE TOTAL ENVIRONMENT,707,1-9.
MLA	Li, Zhengzhen,et al."Water stress rather than N addition mitigates impacts of elevated O-3 on foliar chemical profiles in poplar saplings".SCIENCE OF THE TOTAL ENVIRONMENT 707(2020):1-9.