Response of isoprene emission from poplar saplings to ozone pollution and nitrogen deposition depends on leaf position along the vertical canopy profile

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 城市与区域生态国家重点实验室

	Response of isoprene emission from poplar saplings to ozone pollution and nitrogen deposition depends on leaf position along the vertical canopy profile
	Yuan, Xiangyang; Li, Shuangjiang; Feng, Zhaozhong; Xu, Yansen; Shang, Bo; Fares, Silvano; Paoletti, Elena
刊名	ENVIRONMENTAL POLLUTION
	2020-10
卷号	265 期号:PT A 页码:1-11
关键词	Tropospheric O-3 Nitrogen deposition Isoprene emission Poplar Leaf position
ISSN号	0269-7491
英文摘要	We investigated isoprene (ISO) emission and gas exchange in leaves from different positions along the vertical canopy profile of poplar saplings (Populus euramericana cv. '74/76'). For a growing season, plants were subjected to four N treatments, control (NC, no N addition), low N (LN, 50 kg N ha(-1)year(-1)), middle N (MN, 100 kg N ha(-1)year(-1)), high N (HN, 200 kg N ha(-1)year(-1)) and three O-3 treatments (CF, charcoal-filtered ambient air; NF, non-filtered ambient air; NF + O-3, NF + 40 ppb O-3). Our results showed the effects of O-3 and/or N on standardized ISO rate (ISOrate) and photosynthetic parameters differed along with the leaf position, with larger negative effects of O-3 and positive effects of N on ISOrate and photosynthetic parameters in the older leaves. Expanded young leaves were insensitive to both treatments even at very high O-3 concentration (67 ppb as 10-h average) and HN treatment. Significant O-3 x N interactions were only found in middle and lower leaves, where ISOrate declined by O-3 just when N was limited (NC and LN). With increasing light-saturated photosynthesis and chlorophyll content, ISOrate was reduced in the upper leaves but on the contrary increased in middle and lower leaves. The responses of ISOrate to AOT40 (accumulated exposure to hourly O-3 concentrations > 40 ppb) and PODY (accumulative stomatal uptake of 0 3 > Y nmol O-3 m(-2) PLA s(-1)) were not significant in upper leaves, but ISOrate significantly decreased with increasing AOT40 or PODY under limited N supply in middle leaves but at all N levels in lower leaves. Overall, ISOrate changed along the vertical canopy profile in response to combined O-3 and N exposure, a behavior that should be incorporated into multi-layer canopy models. Our results are relevant for modelling regional isoprene emissions under current and future O-3 pollution and N deposition scenarios. (C) 2020 Elsevier Ltd. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/44434]
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	Yuan, Xiangyang,Li, Shuangjiang,Feng, Zhaozhong,et al. Response of isoprene emission from poplar saplings to ozone pollution and nitrogen deposition depends on leaf position along the vertical canopy profile[J]. ENVIRONMENTAL POLLUTION,2020,265(PT A):1-11.
APA	Yuan, Xiangyang.,Li, Shuangjiang.,Feng, Zhaozhong.,Xu, Yansen.,Shang, Bo.,...&Paoletti, Elena.(2020).Response of isoprene emission from poplar saplings to ozone pollution and nitrogen deposition depends on leaf position along the vertical canopy profile.ENVIRONMENTAL POLLUTION,265(PT A),1-11.
MLA	Yuan, Xiangyang,et al."Response of isoprene emission from poplar saplings to ozone pollution and nitrogen deposition depends on leaf position along the vertical canopy profile".ENVIRONMENTAL POLLUTION 265.PT A(2020):1-11.