Effects of elevated ozone and water deficit on poplar saplings: Changes in carbon and nitrogen stocks and their allocation to different organs

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	Effects of elevated ozone and water deficit on poplar saplings: Changes in carbon and nitrogen stocks and their allocation to different organs
	Shang, Bo ; Yuan, Xiangyang ; Li, Pin ; Xu, Yansen ; Feng, Zhaozhong
刊名	FOREST ECOLOGY AND MANAGEMENT
	2019-06-01
卷号	441 页码:89-98
关键词	Carbon stock Drought Growth Nitrogen stock Ozone Poplar
ISSN号	0378-1127
英文摘要	Ozone (O-3) pollution and drought are frequent in summer, which adversely affects plant growth. In this study, we investigated the interactive effects of O-3 and water deficit on growth parameters, and carbon (C) and nitrogen (N) stocks and their allocation to different organs in poplar saplings in the summer of 2017. The saplings were subjected singularly and in combination to two chronic O-3 treatments (charcoal-filtered air [CF] and ambient air + 40 ppb of O-3 [E-O-3]) and two watering regimens (well-watered [WW] and reduced watering [RW]). The results showed that both O-3 and drought inhibited poplar growth, whereas the effects of drought were greater than those of O-3. Moreover, drought stress protected the saplings from O-3 damage, suggesting that some previous studies on well-watered plants might have overestimated the damage caused by O-3 . Inconsistent with the general trend, RW significantly increased the light-saturated rate of CO2 assimilation (A(sat)) in this study, whereas it reduced the total leaf area. E-O-3 significantly increased the N concentration and reduced the C/N ratio of each organ as well as the total C stock (CStotal), while it did not significantly affect the total N stock (NStotal). Drought significantly increased the C and N concentrations and reduced the C/N ratio in most organs, and significantly reduced the C stock of each organ, CStotal and NStotal CStotal was positively correlated with the total leaf area and the photosynthetic rate of the whole plants (A(plant)). However, there was no significant relationship between CS(total )and A(sat,) suggesting that A(plant) can better reflect the growth of the whole plant than A(sat). In addition, NStotal was positively correlated with the root biomass. Both O-3 and drought had no significant effect on the ratio between the root and shoot N stocks, and there were also no interactive effects of O-3 and drought on most C and N parameters. These findings will facilitate better understandings of C and N metabolisms future environment with higher O-3 and more frequent droughts.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/42722]
专题	生态环境研究中心_城市与区域生态国家重点实验室
作者单位	1.Nanjing Univ Informat Sci & Technol, Inst Ecol, Nanjing 210044, Jiangsu, Peoples R China 2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Shuangqing Rd 18, Beijing 100085, Peoples R China
推荐引用方式 GB/T 7714	Shang, Bo,Yuan, Xiangyang,Li, Pin,et al. Effects of elevated ozone and water deficit on poplar saplings: Changes in carbon and nitrogen stocks and their allocation to different organs[J]. FOREST ECOLOGY AND MANAGEMENT,2019,441:89-98.
APA	Shang, Bo,Yuan, Xiangyang,Li, Pin,Xu, Yansen,&Feng, Zhaozhong.(2019).Effects of elevated ozone and water deficit on poplar saplings: Changes in carbon and nitrogen stocks and their allocation to different organs.FOREST ECOLOGY AND MANAGEMENT,441,89-98.
MLA	Shang, Bo,et al."Effects of elevated ozone and water deficit on poplar saplings: Changes in carbon and nitrogen stocks and their allocation to different organs".FOREST ECOLOGY AND MANAGEMENT 441(2019):89-98.