Microbial stoichiometric flexibility regulates rice straw mineralization and its priming effect in paddy soil

doi:10.1016/j.soilbio.2018.03.003

	Microbial stoichiometric flexibility regulates rice straw mineralization and its priming effect in paddy soil
	Zhu, Zhenke 1,2; Ge, Tida 1,2; Luo, Yu 3; Liu, Shoulong 1; Xu, Xingliang 4; Tong, Chengli 1; Shibistova, Olga 5,6; Guggenberger, Georg 1,5; Wu, Jinshui 1,2
刊名	SOIL BIOLOGY & BIOCHEMISTRY
	2018-06-01
卷号	121 页码:67-76
关键词	Element stoichiometry Extracellular enzyme activity Soil microbial biomass Soil organic matter turnover Priming effect Structural equation models
ISSN号	0038-0717
DOI	10.1016/j.soilbio.2018.03.003
通讯作者	Ge, Tida(gtd@isa.ac.cn)
英文摘要	Nitrogen (N) and phosphorus (P) availability plays a crucial role in carbon (C) cycling in terrestrial ecosystems. However, the C:N:P stoichiometric regulation of microbial mineralization of plant residues and its impact on the soil priming effect (PE), measured as CO2 and CH4 emission, in paddy soils remain unclear. In this study, the effect of soil C:N:P stoichiometry (regulated by the application of N and P fertilizers) on the mineralization of C-13-labelled rice straw and the subsequent PE was investigated in a 100-day incubation experiment in flooded paddy soil. N and P additions increased straw mineralization by approximately 25% and 10%, respectively. Additions of both N and P led to higher CO2 efflux, but lower CH4 emission. With an increase in the ratios of DOC:NH4+ -N, DOC:Olsen P, and microbial biomass C:N, (CO2)-C-13 efflux increased exponentially to a maximum. Compared with sole straw addition, exclusive N addition led to a weaker PE for CO2 emission, whereas exclusive P addition induced a stronger PE for CO2 emission. In contrast, CH4 emitted from native soil organic matter (SOM) was reduced by 7.4% and 46.1% following P and NP application, respectively. Structural equation models suggest that available N had dominant and direct positive effects, whereas microbial biomass stoichiometry mainly exerted negative indirect effects on PE. The stoichiometry of soil enzyme activity directly down-regulated CH4 emission from SOM. Microbes obviously regulate soil C turnover via stoichiometric flexibility to maintain an elemental stoichiometric balance between resources and microbial requirements. The addition of straw in combination with N and P fertilization in paddy soils could therefore meet microbial stoichiometric requirements and regulate microbial activity and extracellular enzyme production, resulting in co-metabolism of fresh C and native SOM.
资助项目	National Key Research and Development program[2016YFE0101100] ; National Natural Science Foundation of China[41430860] ; National Natural Science Foundation of China[41501321] ; National Natural Science Foundation of China[41371304] ; Youth Innovation Team Project of the Institute of Subtropical Agriculture, Chinese Academy of Sciences[2017QNCXTD_GTD] ; Chinese Academy of Sciences President's International Fellowship Initiative[2018VCA0031]
WOS关键词	ORGANIC-MATTER DECOMPOSITION ; ECOENZYMATIC STOICHIOMETRY ; ECOLOGICAL STOICHIOMETRY ; CARBON MINERALIZATION ; NUTRIENT LIMITATION ; NITROGEN ADDITIONS ; METHANE PRODUCTION ; C MINERALIZATION ; TROPICAL FOREST ; ROOT RESIDUES
WOS研究方向	Agriculture
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000432884100011
资助机构	National Key Research and Development program ; National Natural Science Foundation of China ; Youth Innovation Team Project of the Institute of Subtropical Agriculture, Chinese Academy of Sciences ; Chinese Academy of Sciences President's International Fellowship Initiative
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/54948]
专题	中国科学院地理科学与资源研究所
通讯作者	Ge, Tida
作者单位	1.Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Hunan, Peoples R China 2.Chinese Acad Sci, Inst Subtrop Agr, Changsha Res Stn Agr & Environm Monitoring, Changsha 410125, Hunan, Peoples R China 3.Zhejiang Univ, Zhejiang Prov Key Lab Agr Resources & Environm, Inst Soil & Water Resources & Environm Sci, Hangzhou 310058, Zhejiang, Peoples R China 4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100081, Peoples R China 5.Leibniz Univ Hannover, Inst Soil Sci, D-30419 Hannover, Germany 6.SB RAS, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia
推荐引用方式 GB/T 7714	Zhu, Zhenke,Ge, Tida,Luo, Yu,et al. Microbial stoichiometric flexibility regulates rice straw mineralization and its priming effect in paddy soil[J]. SOIL BIOLOGY & BIOCHEMISTRY,2018,121:67-76.
APA	Zhu, Zhenke.,Ge, Tida.,Luo, Yu.,Liu, Shoulong.,Xu, Xingliang.,...&Wu, Jinshui.(2018).Microbial stoichiometric flexibility regulates rice straw mineralization and its priming effect in paddy soil.SOIL BIOLOGY & BIOCHEMISTRY,121,67-76.
MLA	Zhu, Zhenke,et al."Microbial stoichiometric flexibility regulates rice straw mineralization and its priming effect in paddy soil".SOIL BIOLOGY & BIOCHEMISTRY 121(2018):67-76.