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231225s2020 xx |||||o 00| ||eng c |
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|a 10.1111/gcb.15100
|2 doi
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|a pubmed24n1027.xml
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|a (DE-627)NLM308132955
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|a (NLM)32227617
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Huang, Wenjuan
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Trade-offs in soil carbon protection mechanisms under aerobic and anaerobic conditions
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|c 2020
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 15.09.2020
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|a Date Revised 15.09.2020
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2020 John Wiley & Sons Ltd.
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|a Oxygen (O2 ) limitation is generally understood to suppress oil carbon (C) decomposition and is a key mechanism impacting terrestrial C stocks under global change. Yet, O2 limitation may differentially impact kinetic or thermodynamic versus physicochemical C protection mechanisms, challenging our understanding of how soil C may respond to climate-mediated changes in O2 dynamics. Although O2 limitation may suppress decomposition of new litter C inputs, release of physicochemically protected C due to iron (Fe) reduction could potentially sustain soil C losses. To test this trade-off, we incubated two disparate upland soils that experience periodic O2 limitation-a tropical rainforest Oxisol and a temperate cropland Mollisol-with added litter under either aerobic (control) or anaerobic conditions for 1 year. Anoxia suppressed total C loss by 27% in the Oxisol and by 41% in the Mollisol relative to the control, mainly due to the decrease in litter-C decomposition. However, anoxia sustained or even increased decomposition of native soil-C (11.0% vs. 12.4% in the control for the Oxisol and 12.5% vs. 5.3% in the control for the Mollisol, in terms of initial soil C mass), and it stimulated losses of metal- or mineral-associated C. Solid-state 13 C nuclear magnetic resonance spectroscopy demonstrated that anaerobic conditions decreased protein-derived C but increased lignin- and carbohydrate-C relative to the control. Our results indicate a trade-off between physicochemical and kinetic/thermodynamic C protection mechanisms under anaerobic conditions, whereby decreased decomposition of litter C was compensated by more extensive loss of mineral-associated soil C in both soils. This challenges the common assumption that anoxia inherently protects soil C and illustrates the vulnerability of mineral-associated C under anaerobic events characteristic of a warmer and wetter future climate
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|a Journal Article
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|a 13C NMR
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|a C3/C4 plant
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|a DOC
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|a anaerobic
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|a anoxic
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|a carbon stable isotope
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| 650 |
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|a iron reduction
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| 650 |
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|a litter decomposition
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| 650 |
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|a mineral-associated carbon
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| 650 |
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|a oxygen
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| 650 |
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|a Soil
|2 NLM
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| 650 |
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|a Carbon
|2 NLM
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| 650 |
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|a 7440-44-0
|2 NLM
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| 650 |
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|a Lignin
|2 NLM
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| 650 |
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|a 9005-53-2
|2 NLM
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| 700 |
1 |
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|a Ye, Chenglong
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Hockaday, William C
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Hall, Steven J
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Global change biology
|d 1999
|g 26(2020), 6 vom: 01. Juni, Seite 3726-3737
|w (DE-627)NLM098239996
|x 1365-2486
|7 nnns
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| 773 |
1 |
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|g volume:26
|g year:2020
|g number:6
|g day:01
|g month:06
|g pages:3726-3737
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| 856 |
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|u http://dx.doi.org/10.1111/gcb.15100
|3 Volltext
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|d 26
|j 2020
|e 6
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|c 06
|h 3726-3737
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