Depth heterogeneity of soil organic carbon dynamicsin a heavily grazed alpine meadow on thenortheastern Tibetan Plateau: Aradiocarbon-based approach

doi:10.1002/2016JG003567

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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
发表期刊	Journal of Geophysical Research: Biogeosciences
卷号	122 期号:7 页码:1775-1788
文章类型	期刊论文
摘要	A 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.
DOI	10.1002/2016JG003567
收录类别	SCI
所属项目编号	2016YFC0500200
语种	英语
项目资助者	“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
引用统计	被引频次：11[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/5587
专题	加速器质谱中心
通讯作者	Yu,Shiyong
作者单位	1.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
推荐引用方式 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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