Microbial carbon use efficiency and priming effect regulate soil carbon storage under nitrogen deposition by slowing soil organic matter decomposition

doi:10.1016/j.geoderma.2018.07.008

	Microbial carbon use efficiency and priming effect regulate soil carbon storage under nitrogen deposition by slowing soil organic matter decomposition
	Liu, Weixing ; Qiao, Chunlian 1; Yang, Sen 2; Bai, Wenming; Liu, Lingli2
	2018
发表期刊	GEODERMA
ISSN	0016-7061
卷号	332 页码:37-44
摘要	Microbial carbon use efficiency (CUE) strongly influences the rate of soil organic carbon (SOC) formation by mediating C loss via microbial respiration, whereas the priming effect plays a crucial role in regulating the stability of SOC. Nitrogen (N) deposition increases N availability and alters litter quality and quantity, both of which could strongly affect the CUE and priming effect. However, it remains unclear whether and how, under N deposition, the CUE and priming effect could affect soil C cycling. In this study, we conducted a consecutive 12-yr N addition experiment in a temperate steppe. We evaluated how increasing N inputs affect soil C accumulation, microbial respiration, microbial biomass and composition in the field. We also performed an incubation experiment by adding C-13 labeled glucose and phenol to the pre-incubated soils to test how N addition affects microbial CUE and the priming effects on stable soil C. Our field experiment showed that N addition increased soil organic C concentration and decreased soil microbial respiration, microbial total phospholipid fatty acids (PLFAs), and fungi to bacteria (F:B) ratio. Our incubation experiments indicated that N addition increased microbial CUE of glucose but decreased that of phenol. The priming effects of both glucose and phenol were suppressed by N addition. Redundancy analysis (RDA) showed the importance of fungi in regulating microbial CUE and priming effect Specifically, multi-model averaging suggested that the decreased fungal biomass under N addition was the most important predictor for changes in CUE of glucose, while decreased fungal biomass and F:B ratio were the most important predictors for changes in the CUE and priming effects. In addition, the increased CUE of glucose best explained the decreased microbial respiration, and the reduced priming effect of glucose best explained the increased SOC under N addition. Overall, our finding suggested that N addition would alter microbial CUE and the priming effects on stable soil C. The different responses of CUE and priming effects to glucose and phenol addition imply that the decreased microbial respiration and increased C storage under N deposition could be more attributed to labile C inputs rather than recalcitrant C inputs.
关键词	C-13 labeled substrates Carbon sequestration Fertilization Microbial community Microbial respiration Soil organic matter turnover
学科领域	Soil Science
DOI	10.1016/j.geoderma.2018.07.008
收录类别	SCI
语种	英语
WOS关键词	PLANT LITTER DECOMPOSITION ; TEMPERATURE SENSITIVITY ; FUNGAL RESIDUES ; N DEPOSITION ; CO2 EFFLUX ; BACTERIAL ; COMMUNITIES ; BIOMASS ; SEQUESTRATION ; FERTILIZATION
WOS记录号	WOS:000441487000005
出版者	ELSEVIER
文献子类	Article
出版地	AMSTERDAM
EISSN	1872-6259
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31370488, 31522011] ; Chinese National Key Development Program for Basic Research [2013CB956304, 2014CB954003] ; National 1000 Young Talents Program
作者邮箱	Lingli.liu@ibcas.ac.cn
引用统计	被引频次：88[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/20547
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.Xinyang Normal Univ, Coll Life Sci, Xinyang 464000, Henan, Peoples R China 3.Univ Chinese Acad Sci, Yuquan Rd, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Liu, Weixing,Qiao, Chunlian,Yang, Sen,et al. Microbial carbon use efficiency and priming effect regulate soil carbon storage under nitrogen deposition by slowing soil organic matter decomposition[J]. GEODERMA,2018,332:37-44.
APA	Liu, Weixing,Qiao, Chunlian,Yang, Sen,Bai, Wenming,&Liu, Lingli.(2018).Microbial carbon use efficiency and priming effect regulate soil carbon storage under nitrogen deposition by slowing soil organic matter decomposition.GEODERMA,332,37-44.
MLA	Liu, Weixing,et al."Microbial carbon use efficiency and priming effect regulate soil carbon storage under nitrogen deposition by slowing soil organic matter decomposition".GEODERMA 332(2018):37-44.

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