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Depth heterogeneity of soil organic carbon dynamicsin a heavily grazed alpine meadow on thenortheastern Tibetan Plateau: Aradiocarbon-based approach
Yu,SY(Yu,Shiyong)1; He,HL(He,Honglin)2; Cheng,P(Cheng,Peng)3; Hou,ZF(Hou,Zhangfang)4; Yu,Shiyong
2017-06
Source PublicationJournal of Geophysical Research: Biogeosciences
Volume122Issue:7Pages:1775-1788
Subtype期刊论文
AbstractA deep understanding of soil organic carbon (SOC) dynamics on the Tibetan Plateau is crucial for predicting the response of the alpine carbon pool to future climate changes. Here we present information about SOC stocks and turnover time in a heavily grazed alpine meadow on the Tibetan Plateau based on radiocarbon (14C) measurements and inverse modeling. Our results reveal that the alpine meadow soil is composed of three distinct carbon pools. The topsoil represents the active carbon pool, which has a carbon inventory-weighted mean turnover time of 64 years. The CO2 efflux due to the mineral soil respiration from this pool is ca. 48.45 g C m-2 yr-1, accounting for 91 % of the total heterotrophic soil respiration. The intermediate carbon pool has an inventory-weighted mean turnover time of 780 years and the rate of mineral soil respiration in this pool is an order of magnitude lower than that in the active carbon pool. The parental materials feature the passive carbon pool, which has millennia-long turnover time and the mineral soil respiration is trivial. Comparing our results with other 14C-based studies suggests that grazing intensity may alter not only the SOC stocks but also the soil respiration rate in the alpine grassland ecosystem. The heavily grazed alpine meadow broadly fits the exponential relationship between turnover time and mean annual air temperature identified by meta-analysis of published data from the Tibetan Plateau, alpine grassland, and forest sites elsewhere.
DOI10.1002/2016JG003567
Indexed BySCI
Project Number2016YFC0500200
Language英语
Funding Organization“100-talent” Program of the ChineseAcademy of Sciences and the NationalKey Technologies R&D Program of China ; “100-talent” Program of the ChineseAcademy of Sciences and the NationalKey Technologies R&D Program of China
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/5587
Collection加速器质谱中心
Corresponding AuthorYu,Shiyong
Affiliation1.School of Geography, Geomatics, and Planning, Jiangsu Normal University, Xuzhou, China
2.Synthesis Research Center ofChina’s Ecosystem Research Network and Key Laboratory of Ecosystem Network Observation and Modeling, Institute ofGeographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
3.State Key Laboratoryof Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, China
4.School ofEnvironment and Planning, Liaocheng University, Liaocheng, China
Recommended Citation
GB/T 7714
Yu,SY,He,HL,Cheng,P,et al. Depth heterogeneity of soil organic carbon dynamicsin a heavily grazed alpine meadow on thenortheastern Tibetan Plateau: Aradiocarbon-based approach[J]. Journal of Geophysical Research: Biogeosciences,2017,122(7):1775-1788.
APA Yu,SY,He,HL,Cheng,P,Hou,ZF,&Yu,Shiyong.(2017).Depth heterogeneity of soil organic carbon dynamicsin a heavily grazed alpine meadow on thenortheastern Tibetan Plateau: Aradiocarbon-based approach.Journal of Geophysical Research: Biogeosciences,122(7),1775-1788.
MLA Yu,SY,et al."Depth heterogeneity of soil organic carbon dynamicsin a heavily grazed alpine meadow on thenortheastern Tibetan Plateau: Aradiocarbon-based approach".Journal of Geophysical Research: Biogeosciences 122.7(2017):1775-1788.
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