Global turnover of soil mineral-associated and particulate organic carbon.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38909059.
- Also identified by DOI 10.1038/s41467-024-49743-7 and PMC identifier 11193739.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Soil organic carbon (SOC) persistence is predominantly governed by mineral protection, consequently, soil mineral-associated (MAOC) and particulate organic carbon (POC) turnovers have different impacts on the vulnerability of SOC to climate change. Here, we generate the global MAOC and POC maps using 8341 observations and then infer the turnover times of MAOC and POC by a data-model integration approach. Global MAOC and POC storages are <math xmlns="http://www.w3.org/1998/Math/MathML"> <msubsup><mrow><mn>975</mn></mrow> <mrow><mn>964</mn></mrow> <mrow><mn>987</mn></mrow> </msubsup> </math> Pg C (mean with 5% and 95% quantiles) and <math xmlns="http://www.w3.org/1998/Math/MathML"> <msubsup><mrow><mn>330</mn></mrow> <mrow><mn>323</mn></mrow> <mrow><mn>337</mn></mrow> </msubsup> </math> Pg C, while global mean MAOC and POC turnover times are <math xmlns="http://www.w3.org/1998/Math/MathML"> <msubsup><mrow><mn>129</mn></mrow> <mrow><mn>45</mn></mrow> <mrow><mn>383</mn></mrow> </msubsup> </math> yr and <math xmlns="http://www.w3.org/1998/Math/MathML"> <msubsup><mrow><mn>23</mn></mrow> <mrow><mn>5</mn></mrow> <mrow><mn>82</mn></mrow> </msubsup> </math> yr in the top meter, respectively. Climate warming-induced acceleration of MAOC and POC decomposition is greater in subsoil than that in topsoil. Overall, the global atlas of MAOC and POC turnover, together with the global distributions of MAOC and POC stocks, provide a benchmark for Earth system models to diagnose SOC-climate change feedback.