DOI: 10.1111/gcb.14009
Scopus记录号: 2-s2.0-85038879875
论文题名: Nitrogen-rich microbial products provide new organo-mineral associations for the stabilization of soil organic matter
作者: Kopittke P.M. ; Hernandez-Soriano M.C. ; Dalal R.C. ; Finn D. ; Menzies N.W. ; Hoeschen C. ; Mueller C.W.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 4 起始页码: 1762
结束页码: 1770
语种: 英语
英文关键词: nano-scale secondary ion mass spectrometry
; organo-mineral interactions
; soil carbon cycling
; soil carbon storage
; stable isotopes
Scopus关键词: Alfisol
; carbon cycle
; mass spectrometry
; soil carbon
; soil nitrogen
; soil organic matter
; stable isotope
; Vertisol
; Medicago sativa
英文摘要: Understanding the cycling of C and N in soils is important for maintaining soil fertility while also decreasing greenhouse gas emissions, but much remains unknown about how organic matter (OM) is stabilized in soils. We used nano-scale secondary ion mass spectrometry (NanoSIMS) to investigate the changes in C and N in a Vertisol and an Alfisol incubated for 365 days with 13C and 15N pulse labeled lucerne (Medicago sativa L.) to discriminate new inputs of OM from the existing soil OM. We found that almost all OM within the free stable microaggregates of the soil was associated with mineral particles, emphasizing the importance of organo-mineral interactions for the stabilization of C. Of particular importance, it was also found that 15N-rich microbial products originating from decomposition often sorbed directly to mineral surfaces not previously associated with OM. Thus, we have shown that N-rich microbial products preferentially attach to distinct areas of mineral surfaces compared to C-dominated moieties, demonstrating the ability of soils to store additional OM in newly formed organo-mineral associations on previously OM-free mineral surfaces. Furthermore, differences in 15N enrichment were observed between the Vertisol and Alfisol presumably due to differences in mineralogy (smectite-dominated compared to kaolinite-dominated), demonstrating the importance of mineralogy in regulating the sorption of microbial products. Overall, our findings have important implications for the fundamental understanding of OM cycling in soils, including the immobilization and storage of N-rich compounds derived from microbial decomposition and subsequent N mineralization to sustain plant growth. © 2017 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110454
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: School of Agriculture and Food Sciences, The University of Queensland, St. Lucia, QLD, Australia; Lehrstuhl für Bodenkunde, Technische Universität München, Freising, Germany
Recommended Citation:
Kopittke P.M.,Hernandez-Soriano M.C.,Dalal R.C.,et al. Nitrogen-rich microbial products provide new organo-mineral associations for the stabilization of soil organic matter[J]. Global Change Biology,2018-01-01,24(4)