C:N stoichiometry of stable and labile organic compounds determine priming patterns

doi:10.1016/j.geoderma.2019.114122

	C:N stoichiometry of stable and labile organic compounds determine priming patterns
	Liu, Min 1,2; Qiao, Na 2; Xu, Xingliang 2; Fang, Huajun 2; Wang, Huimin 2; Kuzyakov, Yakov 2,3
刊名	GEODERMA
	2020-03-15
卷号	362 页码:9
关键词	Labile organic carbon Organic matter decomposition Priming effects Stoichiometry Climate change Nitrate and ammonium
ISSN号	0016-7061
DOI	10.1016/j.geoderma.2019.114122
通讯作者	Xu, Xingliang(xuxingl@hotmail.com)
英文摘要	Priming effects (PE) can greatly influence global carbon (C) storage in soil and lead to climate feedbacks by accelerating the decomposition of organic matter (OM). Although nitrogen (N) availability can alter the magnitude and direction of priming (stoichiometric constrains), it remains unclear whether additions of NO3- (nitrate) and NH4+ (ammonium) have distinct effects on the decomposition of various OM. Thus, the aims of this study were to investigate the responses of OM decomposition along a decay continuum (i.e. decreasing decomposition degree) to labile C and N inputs and determine the PE induced by the two N forms. Four OM forms, namely leaf litter, wood litter, organic soil horizon, and mineral soil, with a broad range of C:N ratios were collected along a decay continuum in a typical subtropical forest and incubated for 38 days with labile C (C-13 labeled glucose) and N (NO3-) additions. Based on the very broad range of C:N ratios in OM in soil and inputs of labile C and N, we demonstrated the OM decomposition within a decay continuum as well as PE intensities and the thresholds for the switch of PE directions. In contrast to NH4+ additions, NO3- generally accelerated the decomposition of all OM. Priming of plant litter was dependent on the C:N ratios of the labile inputs. However, leaf litter decomposition was more controlled by N addition than wood litter. Glucose addition greatly increased the priming of OM decomposition in soils, demonstrating energy limitation for microorganisms. Distinct priming patterns were observed between NO3- and NH4+ additions, both for the individual OM types and for all four types of OM. On a basis of C balance between primed C and the remaining added C, PE induced by labile C and N inputs can increase or reduce C sequestration depending on C:N stoichiometric ratios of labile inputs. Our findings provide important insights into the specific role of NO3- or NH4+ together with labile C inputs (e.g. from root exudation), and thus changes in the composition of deposited N (atmospheric deposition and fertilization) may induce distinct climate feedbacks.
资助项目	National Natural Science Foundation of China[41830646] ; National Natural Science Foundation of China[41601318] ; National Natural Science Foundation of China[31470560] ; National Natural Science Foundation of China[41671031] ; China Postdocotral Science Foundation[2016 M600123] ; Youth Innovation Research Team Project[LENOM2016Q0004]
WOS关键词	SOIL MICROBIAL BIOMASS ; PHOSPHORUS LIMITATION ; CARBON DECOMPOSITION ; LITTER DECOMPOSITION ; NITRATE NUTRITION ; ATMOSPHERIC CO2 ; N AVAILABILITY ; FRESH CARBON ; AMINO-ACIDS ; NITROGEN
WOS研究方向	Agriculture
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000514019700017
资助机构	National Natural Science Foundation of China ; China Postdocotral Science Foundation ; Youth Innovation Research Team Project
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/132790]
专题	中国科学院地理科学与资源研究所
通讯作者	Xu, Xingliang
作者单位	1.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 101408, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, 11A Datun Rd, Beijing 100101, Peoples R China 3.Univ Gottingen, Dept Agr Soil Sci, Busgenweg 2, D-37077 Gottingen, Germany
推荐引用方式 GB/T 7714	Liu, Min,Qiao, Na,Xu, Xingliang,et al. C:N stoichiometry of stable and labile organic compounds determine priming patterns[J]. GEODERMA,2020,362:9.
APA	Liu, Min,Qiao, Na,Xu, Xingliang,Fang, Huajun,Wang, Huimin,&Kuzyakov, Yakov.(2020).C:N stoichiometry of stable and labile organic compounds determine priming patterns.GEODERMA,362,9.
MLA	Liu, Min,et al."C:N stoichiometry of stable and labile organic compounds determine priming patterns".GEODERMA 362(2020):9.