Initial shifts in nitrogen impact on ecosystem carbon fluxes in an alpine meadow: patterns and causes

doi:10.1186/s12870-017-0984-8

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	Initial shifts in nitrogen impact on ecosystem carbon fluxes in an alpine meadow: patterns and causes
	Song, Bing 3; Sun, Jian ; Zhou, Qingping 2; Zong, Ning ; Li, Linghao 3; Niu, Shuli 1
刊名	BIOGEOSCIENCES
	2017
卷号	14 期号:17 页码:3947-3956
ISSN号	1726-4170
DOI	10.1186/s12870-017-0984-8
文献子类	Article
英文摘要	Increases in nitrogen (N) deposition can greatly stimulate ecosystem net carbon (C) sequestration through positive N-induced effects on plant productivity. However, how net ecosystem CO2 exchange (NEE) and its components respond to different N addition rates remains unclear. Using an N addition gradient experiment (six levels: 0, 2, 4, 8, 16, 32 gNm 2 yr(-1) in an alpine meadow on the Qinghai-Tibetan Plateau, we explored the responses of different ecosystem C fluxes to an N addition gradient and revealed mechanisms underlying the dynamic responses. Results showed that NEE, ecosystem respiration (ER), and gross ecosystem production (GEP) all increased linearly with N addition rates in the first year of treatment but shifted to N saturation responses in the second year with the highest NEE (7.77 +/- 0.48 mu molm(-2) s(-1) occurring under an N addition rate of 8 gNm(-2) yr(-1). The saturation responses of NEE and GEP were caused by N-induced accumulation of standing litter, which limited light availability for plant growth under high N addition. The saturation response of ER was mainly due to an N-induced saturation response of aboveground plant respiration and decreasing soil microbial respiration along the N addition gradient, while decreases in soil microbial respiration under high N addition were caused by N-induced reductions in soil pH. We also found that various components of ER, including aboveground plant respiration, soil respiration, root respiration, and microbial respiration, responded differentially to the N addition gradient. These results reveal temporal dynamics of N impacts and the rapid
学科主题	Plant Sciences
电子版国际标准刊号	1726-4189
出版地	GOTTINGEN
WOS关键词	SOIL RESPIRATION ; INNER-MONGOLIA ; GURBANTUNGGUT DESERT ; NONLINEAR RESPONSES ; CRITICAL LOADS ; TEMPERATE ; DEPOSITION ; COMPONENTS ; WATER ; FERTILIZATION
语种	英语
出版者	COPERNICUS GESELLSCHAFT MBH
WOS记录号	WOS:000394821400001
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31625006, 31470528] ; Ministry of Science and Technology of ChinaMinistry of Science and Technology, China [2016YFC0501803, 2013CB956300] ; Thousand Youth Talents Plan ; West Light Foundation of the Chinese Academy of SciencesChinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/22148]
专题	植被与环境变化国家重点实验室
作者单位	1.Southwest Minzu Univ, Inst Qinghai Tibetan Plateau, Chengdu 610041, Sichuan, Peoples R China 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Datun Rd, Beijing 100101, Peoples R China 4.Univ Chinese Acad Sci, Dept Resources & Environm, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Song, Bing,Sun, Jian,Zhou, Qingping,et al. Initial shifts in nitrogen impact on ecosystem carbon fluxes in an alpine meadow: patterns and causes[J]. BIOGEOSCIENCES,2017,14(17):3947-3956.
APA	Song, Bing,Sun, Jian,Zhou, Qingping,Zong, Ning,Li, Linghao,&Niu, Shuli.(2017).Initial shifts in nitrogen impact on ecosystem carbon fluxes in an alpine meadow: patterns and causes.BIOGEOSCIENCES,14(17),3947-3956.
MLA	Song, Bing,et al."Initial shifts in nitrogen impact on ecosystem carbon fluxes in an alpine meadow: patterns and causes".BIOGEOSCIENCES 14.17(2017):3947-3956.