DOI: 10.1007/s10533-017-0313-1
Scopus记录号: 2-s2.0-85014517088
论文题名: Microbial uptake and utilization of low molecular weight organic substrates in soil depend on carbon oxidation state
作者: Gunina A. ; Smith A.R. ; Kuzyakov Y. ; Jones D.L.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 133, 期: 1 起始页码: 89
结束页码: 100
语种: 英语
英文关键词: Carbon use efficiency
; CUE
; Decomposition kinetics
; Dissolved organic nitrogen
; Organic acids
Scopus关键词: decomposition
; dissolved organic nitrogen
; microbial activity
; molecular analysis
; nutrient uptake
; nutrient use efficiency
; organic acid
; organic carbon
; organic compound
; oxidation
; reaction kinetics
; soil organic matter
; transformation
英文摘要: The fate of low molecular weight organic substances (LMWOSs) in soil is regulated by microbial uptake. However, C oxidation state, the number of C atoms and –COOH groups in the LMWOS can affect their microbial utilization. Thus, the aim of this study was to reveal the effects of substance chemical properties on initial uptake and utilization of sugars, carboxylic and amino acids by microorganisms. Soil solution, spiked with 14C-labelled glucose, fructose, malate, succinate, formate, alanine or glycine, was added to the soil and 14C was traced in the soil solution, CO2, cytosol, and soil organic carbon (SOC) over 24 h. The half-life time of all LMWOS in the soil solution varied between 0.6 min (formic acid) and 5.0 min (sugars), indicating its dependence on C oxidation state of the substances. The half-life time of 14C in the fast mineralized pool in microorganisms, ranged between 30 (malic acid) and 80 (glycine) min and was independent on either C oxidation state, the number of C atoms, or number of –COOH groups. This suggests that intercellular metabolic pathways are more important for LMWOS transformation in soil than their basic chemical properties. The portion of mineralized LMWOS increased with their C oxidation state (20% for sugars vs. 90% for formic acid) corresponding to the decrease of C incorporated into the cytosol and SOC pools. Concluding, the physicochemical properties of the common LMWOS allow predicting their microbial uptake from soil solution and subsequent partitioning of C within microbial biomass. © 2017, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83289
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: School of Environment, Natural Resources and Geography, Bangor University, Bangor, Gwynedd, United Kingdom; Department of Agricultural Soil Science, Georg-August University of Göttingen, Buesgenweg 2, Göttingen, Germany; Department of Soil Science of Temperate Ecosystems, Georg-August University of Göttingen, Göttingen, Germany
Recommended Citation:
Gunina A.,Smith A.R.,Kuzyakov Y.,et al. Microbial uptake and utilization of low molecular weight organic substrates in soil depend on carbon oxidation state[J]. Biogeochemistry,2017-01-01,133(1)