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Decoupling of plant carbon and nitrogen under elevated CO2 and nitrogen addition in a typical alpine ecosystem

文献类型：期刊论文

作者Zhao, Guang4; Chen, Yao1,4; Zhang, Yangjian2,4,5; Cong, Nan4; Zheng, Zhoutao4; Zhu, Juntao4; Chen, Ning3
刊名PLANT AND SOIL
出版日期2022-03-16
页码14
关键词Biomass allocation Nitrogen deposition Stoichiometry Alpine ecosystem C N ratio
ISSN号0032-079X
DOI10.1007/s11104-022-05354-z
通讯作者Chen, Yao(cheny.18b@igsnrr.ac.cn)
英文摘要Aims Vegetation in high-altitude regions is hypothesized to be more responsive to increasing atmospheric CO2 concentrations due to low CO2 partial pressure. However, the underlying mechanisms driving this response at an ecosystem scale are poorly understood. We aimed to explore the plant carbon (C) and nitrogen (N) relationships and biomass allocation in response to elevated CO2 and N addition in a Tibetan meadow. Methods A 5-year manipulation experiment was conducted in an alpine meadow (4585 m above sea level) to explore the responses of plant carbon (C), nitrogen (N), and biomass dynamics, as well as their allocation schemes, to elevated CO2 (from 380 ppm to 480 ppm) and N fertilization. Results Elevated CO2 alone significantly enhanced aboveground plant biomass by 98%, exhibiting a stronger CO2 fertilization effect than the global average level (20%) for grasslands. Elevated CO2 favored N accumulation in aboveground parts despite the declined concentration. Nitrogen fertilization alleviated the N constraints on CO2 fertilization effects, which strengthened C sequestration capacity for the aboveground plant tissues. Moreover, our results indicate a decoupling between C and N cycles in alpine ecosystems under elevated CO2, especially in the N-enrichment environments. Conclusions Overall, this study shows a high sensitivity of aboveground plant biomass and decoupled C-N relationships under elevated CO2 and N fertilization for high-elevation alpine ecosystems, highlighting the need to incorporate altitude effects into Earth System Models in predicting C cycle feedbacks to climate changes.
WOS关键词BIOMASS ALLOCATION ; TERRESTRIAL CARBON ; INCREASES CARBON ; ENRICHMENT ; RESPONSES ; LIMITATION ; WATER ; GROWTH ; ROOTS ; PHOTOSYNTHESIS
资助项目National Natural Science Foundation of China[41991234] ; National Natural Science Foundation of China[42101067] ; National Key Research & Development Program of China[2019YFA0607302] ; Strategic Priority Program of Chinese Academy of Science[XDA20050102] ; China Postdoctoral Science Foundation[2019M660781]
WOS研究方向Agriculture ; Plant Sciences
语种英语
WOS记录号WOS:000769821100001
出版者SPRINGER
资助机构National Natural Science Foundation of China ; National Key Research & Development Program of China ; Strategic Priority Program of Chinese Academy of Science ; China Postdoctoral Science Foundation
源URL[http://ir.igsnrr.ac.cn/handle/311030/172915]  
专题中国科学院地理科学与资源研究所
通讯作者Chen, Yao
作者单位1.Univ Chinese Acad Sci, Beijing, Peoples R China
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
3.Chinese Acad Sci, Northeast Inst Geog & Agroecol, Changchun 130102, Peoples R China
4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China
5.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Zhao, Guang,Chen, Yao,Zhang, Yangjian,et al. Decoupling of plant carbon and nitrogen under elevated CO2 and nitrogen addition in a typical alpine ecosystem[J]. PLANT AND SOIL,2022:14.
APA Zhao, Guang.,Chen, Yao.,Zhang, Yangjian.,Cong, Nan.,Zheng, Zhoutao.,...&Chen, Ning.(2022).Decoupling of plant carbon and nitrogen under elevated CO2 and nitrogen addition in a typical alpine ecosystem.PLANT AND SOIL,14.
MLA Zhao, Guang,et al."Decoupling of plant carbon and nitrogen under elevated CO2 and nitrogen addition in a typical alpine ecosystem".PLANT AND SOIL (2022):14.

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来源：地理科学与资源研究所

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