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Ecosystem Carbon Use Efficiency Is Insensitive to Nitrogen Addition in an Alpine Meadow
Ma, Fangfang1,2; Song, Bing1,2; Zhang, Fangyue1,2; Quan, Quan1,2; Zhou, Qingping3; Niu, Shuli1,2
2018-08-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN2169-8953
Volume123Issue:8Pages:2388-2398
Corresponding AuthorNiu, Shuli(sniu@igsnrr.ac.cn)
AbstractCarbon use efficiency (CUE) is an important variable in carbon cycling and a key parameter in biogeochemical models, which is expected to increase with N availability. However, how CUE changes with N input rate remains elusive and lacks field evidence. We implemented a field manipulative experiment to examine effects of N addition with six levels of rate (0, 2, 4, 8, 16, and 32 g.N.m(-2).year(-1)) on canopy CUE (the ratio of net primary productivity [NPP] to gross primary productivity [GPP]) and ecosystem CUE (the ratio of net ecosystem productivity [NEP] to GPP) in an alpine meadow on the Tibetan Plateau in 2014-2016. Over the 3 years, nitrogen addition treatments did not change canopy CUE or ecosystem CUE in comparing with the control, although it significantly increased GPP, NPP, and NEP; those components of CUE had the same response patterns to N addition rates, which shifted from linear responses in the first year to saturation responses thereafter. Moreover, GPP showed a positive linear relationship with NEP, NPP, ecosystem respiration, and autotrophic respiration under each N addition treatment with no changes in slope. The inherent coupling between GPP and ecosystem respiration, as well as GPP and autotrophic respiration, made CUE less sensitive to N addition than carbon fluxes themselves. The conclusions challenge the widely held hypothesis that ecosystem CUE increases with N addition. This study provides the first empirical evidences on the proposition that CUE is insensitive to N availability, which is of importance in model construction and parameterization.
DOI10.1029/2018JG004530
WOS KeywordGROSS PRIMARY PRODUCTION ; NET PRIMARY PRODUCTION ; PLANT RESPIRATION ; FOREST ECOSYSTEMS ; PINE FOREST ; TERRESTRIAL ECOSYSTEMS ; BIOMASS PRODUCTION ; LONG-TERM ; PHOSPHORUS LIMITATION ; CONSTANT FRACTION
Indexed BySCI
Language英语
Funding ProjectMinistry of Science and Technology of China[2016YFC0501803] ; National Science Foundation of China[31625006]
Funding OrganizationMinistry of Science and Technology of China ; National Science Foundation of China
WOS Research AreaEnvironmental Sciences & Ecology ; Geology
WOS SubjectEnvironmental Sciences ; Geosciences, Multidisciplinary
WOS IDWOS:000445731100007
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/52840
Collection中国科学院地理科学与资源研究所
Corresponding AuthorNiu, Shuli
Affiliation1.Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Dept Resources & Environm, Beijing, Peoples R China
3.Southwest Univ Nationalities, Inst Qinghai Tibetan Plateau, Chengdu, Sichuan, Peoples R China
Recommended Citation
GB/T 7714
Ma, Fangfang,Song, Bing,Zhang, Fangyue,et al. Ecosystem Carbon Use Efficiency Is Insensitive to Nitrogen Addition in an Alpine Meadow[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2018,123(8):2388-2398.
APA Ma, Fangfang,Song, Bing,Zhang, Fangyue,Quan, Quan,Zhou, Qingping,&Niu, Shuli.(2018).Ecosystem Carbon Use Efficiency Is Insensitive to Nitrogen Addition in an Alpine Meadow.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,123(8),2388-2398.
MLA Ma, Fangfang,et al."Ecosystem Carbon Use Efficiency Is Insensitive to Nitrogen Addition in an Alpine Meadow".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 123.8(2018):2388-2398.
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