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231225s2021 xx |||||o 00| ||eng c |
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|a 10.1111/gcb.15584
|2 doi
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|a pubmed24n1074.xml
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|a (DE-627)NLM322253594
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|a (NLM)33668074
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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 Craig, Matthew E
|e verfasserin
|4 aut
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| 245 |
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|a Biological mechanisms may contribute to soil carbon saturation patterns
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|c 2021
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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 27.05.2021
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|a Date Revised 27.05.2021
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2021 John Wiley & Sons Ltd.
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|a Increasing soil organic carbon (SOC) storage is a key strategy to mitigate rising atmospheric CO2 , yet SOC pools often appear to saturate, or increase at a declining rate, as carbon (C) inputs increase. Soil C saturation is commonly hypothesized to result from the finite amount of reactive mineral surface area available for retaining SOC, and is accordingly represented in SOC models as a physicochemically determined SOC upper limit. However, mineral-associated SOC is largely microbially generated. In this perspective, we present the hypothesis that apparent SOC saturation patterns could emerge as a result of ecological constraints on microbial biomass-for example, via competition or predation-leading to reduced C flow through microbes and a reduced rate of mineral-associated SOC formation as soil C inputs increase. Microbially explicit SOC models offer an opportunity to explore this hypothesis, yet most of these models predict linear microbial biomass increases with C inputs and insensitivity of SOC to input rates. Synthesis of 54 C addition studies revealed constraints on microbial biomass as C inputs increase. Different hypotheses limiting microbial density were embedded in a three-pool SOC model without explicit limits on mineral surface area. As inputs increased, the model demonstrated either no change, linear, or apparently saturating increases in mineral-associated and particulate SOC pools. Taken together, our results suggest that microbial constraints are common and could lead to reduced mineral-associated SOC formation as input rates increase. We conclude that SOC responses to altered C inputs-or any environmental change-are influenced by the ecological factors that limit microbial populations, allowing for a wider range of potential SOC responses to stimuli. Understanding how biotic versus abiotic factors contribute to these patterns will better enable us to predict and manage soil C dynamics
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|a Journal Article
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|a carbon inputs
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| 650 |
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4 |
|a decomposition
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| 650 |
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4 |
|a microbial biomass
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| 650 |
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4 |
|a microbial density dependence
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| 650 |
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4 |
|a soil carbon model
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| 650 |
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4 |
|a soil carbon sequestration
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| 650 |
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4 |
|a soil organic matter
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| 650 |
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7 |
|a Minerals
|2 NLM
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| 650 |
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7 |
|a Soil
|2 NLM
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| 650 |
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7 |
|a Carbon
|2 NLM
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| 650 |
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7 |
|a 7440-44-0
|2 NLM
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| 700 |
1 |
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|a Mayes, Melanie A
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Sulman, Benjamin N
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Walker, Anthony P
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Global change biology
|d 1999
|g 27(2021), 12 vom: 22. Juni, Seite 2633-2644
|w (DE-627)NLM098239996
|x 1365-2486
|7 nnns
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| 773 |
1 |
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|g volume:27
|g year:2021
|g number:12
|g day:22
|g month:06
|g pages:2633-2644
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|u http://dx.doi.org/10.1111/gcb.15584
|3 Volltext
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|h 2633-2644
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