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- Mason-Jones, Kyle; Schmücker, Niklas; Kuzyakov, Yakov
- Soil biology & biochemistry 2018 v.124 pp. 38-46
- carbon dioxide; mineralization; radionuclides; isotope labeling; glucose; nitrogen; soil organic matter; alanine; deamination; microbial biomass; microorganisms; soil; carbon; carbon nitrogen ratio; extracellular enzymes; mining; ammonium sulfate; prediction
- ... Addition of easily available organic substances to soil often increases the CO₂ efflux from pre-existing soil carbon (C). This phenomenon is often explained in terms of the Nitrogen (N)-Mining Hypothesis. According to this proposed – but never conclusively proven – mechanism, increased C availability induces N limitation in microbes, which then access N by degrading soil organic matter (SOM) – a p ...
- Oldfield, Emily E.; Crowther, Thomas W.; Bradford, Mark A.
- Soil biology & biochemistry 2018 v.124 pp. 218-226
- amino acids; carbon dioxide; carbon sinks; climate change; glucose; isotope labeling; microbial biomass; microbial communities; oxalic acid; root exudates; soil; soil organic matter; stable isotopes; temperature
- ... The size of the soil carbon sink depends on the balance between soil organic matter (SOM) formation and decomposition. Our understanding of how SOM forms and is stabilized, however, is shifting. Traditional theory maintains the formation of SOM is due to chemical complexity: difficult to decompose plant inputs persist in the soil while easily decomposable inputs are respired as CO₂. However, conse ...