IGSNRR OpenIR
Organic nitrogen addition causes decoupling of microbial nitrogen cycles by stimulating gross nitrogen transformation in a temperate forest soil
Lu, Mingzhu1,2; Cheng, Shulan2; Fang, Huajun1,2,3; Xu, Meng1; Yang, Yan1,2; Li, Yuna2; Zhang, Jinbo4; Mueller, Christoph5,6
2021-03-01
Source PublicationGEODERMA
ISSN0016-7061
Volume385Pages:9
Corresponding AuthorFang, Huajun(fanghj@igsnrr.ac.cn)
AbstractExternal inorganic and organic nitrogen (N) inputs can contrastingly affect the transformation and availability of N in forest soils. Studies have mainly focused on the effects of inorganic N enrichment, whereas little is known about the effects of organic N input on soil gross N transformation and the underlying microbial mechanisms. Here we conducted a laboratory N-15 tracing study in a temperate needle-broadleaved mixed forest with a fertilization rate of 0, 20, 60, and 120 kg urea-N ha(-1) yr(-1) over three years. We investigated the key drivers of soil N transformation processes using a 15 N tracing model in the context of selected soil chemical properties and microbial characteristics. Urea addition did not change soil gross N mineralization rates, while stimulating mineralization of labile organic N (M-Nlab). Urea addition at a rate of 120 kg N ha(-1) yr(-1) significantly increased autotrophic nitrification and gross nitrification rates by 88% and 96%, respectively. In contrast, all the three levels of urea addition significantly reduced gross microbial N immobilization by 28% to 52%, leading to an increase in the accumulation of soil NO3--N in the top 10 cm soil layer by 38% to 88%. The changes in autotrophic nitrification were primarily driven by acid-tolerant ammonia-oxidizing archaea (AOA). Fungi were responsible for the change in heterotrophic nitrification under organic N enrichment. Gross N transformation rates were predominately regulated by AOA and fungal abundances as well as soil NO3--N content under high level of organic N addition. The response of soil N transformation to exogenous organic N input depended on N addition level with the threshold rate being estimated to be 60-120 kg N ha(-1) yr(-1) . All lines of evidence showed that the temperate needle-broadleaved mixed forest is moving towards an opener microbial N cycle under elevated organic N deposition. Our finding suggests that the effect of organic N input on soil gross N transformation is different from that of inorganic N input, which should be considered in ecosystem process models.
KeywordOrganic N deposition Gross N transformations N-15 tracing model Microbial group abundances Temperate needle-broadleaved mixed forest
DOI10.1016/j.geoderma.2020.114886
WOS KeywordNONLINEAR RESPONSES ; SUBTROPICAL FOREST ; N TRANSFORMATIONS ; AMMONIA OXIDATION ; SIMULATED N ; DEPOSITION ; NITRATE ; ARCHAEA ; NITRIFICATION ; LIMITATION
Indexed BySCI
Language英语
Funding ProjectSecond Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK1003] ; National Natural Science Foundation of China[41977041] ; National Natural Science Foundation of China[31770558] ; National Natural Science Foundation of China[41907036] ; National Key R&D Program of China[2017YFA0604802] ; National Key R&D Program of China[2017YFA0604804] ; National Key R&D Program of China[2016YFC0500603] ; National Key R&D Program of China[2016YFC0503603] ; CAS Strategic Priority Program[XDA200204020] ; CAS Strategic Priority Program[XDA23060401] ; Thousand Talents Plan Project of High-End Innovative Talents of Qinghai Province (TTPPHEITQP-2019)
Funding OrganizationSecond Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; National Key R&D Program of China ; CAS Strategic Priority Program ; Thousand Talents Plan Project of High-End Innovative Talents of Qinghai Province (TTPPHEITQP-2019)
WOS Research AreaAgriculture
WOS SubjectSoil Science
WOS IDWOS:000609999200035
PublisherELSEVIER
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/136125
Collection中国科学院地理科学与资源研究所
Corresponding AuthorFang, Huajun
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Northwest Plateau Inst Biol, Xining 810001, Qinghai, Peoples R China
4.Nanjing Normal Univ, Sch Geog Sci, Nanjing 210023, Peoples R China
5.Univ Coll Dublin, Sch Biol & Environm Sci, Dublin 4, Ireland
6.Justus Liebig Univ Giessen, Inst Plant Ecol, Giessen, Germany
Recommended Citation
GB/T 7714
Lu, Mingzhu,Cheng, Shulan,Fang, Huajun,et al. Organic nitrogen addition causes decoupling of microbial nitrogen cycles by stimulating gross nitrogen transformation in a temperate forest soil[J]. GEODERMA,2021,385:9.
APA Lu, Mingzhu.,Cheng, Shulan.,Fang, Huajun.,Xu, Meng.,Yang, Yan.,...&Mueller, Christoph.(2021).Organic nitrogen addition causes decoupling of microbial nitrogen cycles by stimulating gross nitrogen transformation in a temperate forest soil.GEODERMA,385,9.
MLA Lu, Mingzhu,et al."Organic nitrogen addition causes decoupling of microbial nitrogen cycles by stimulating gross nitrogen transformation in a temperate forest soil".GEODERMA 385(2021):9.
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