Preprints
https://doi.org/10.5194/bg-2020-298
https://doi.org/10.5194/bg-2020-298

  11 Aug 2020

11 Aug 2020

Review status: a revised version of this preprint was accepted for the journal BG and is expected to appear here in due course.

Soil properties override climate controls on global soil organic carbon stocks

Zhongkui Luo1 and Raphael Viscarra-Rossel2 Zhongkui Luo and Raphael Viscarra-Rossel
  • 1College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, China
  • 2School of Molecular & Life Sciences, Curtin University, Perth, WA 6845, Australia

Abstract. Soil organic carbon (SOC) accounts for two-thirds of terrestrial carbon. Yet, the role of soil physiochemical properties in regulating SOC stocks is unclear, inhibiting reliable SOC predictions under land use and climatic changes. Using legacy observations from 141,584 soil profiles worldwide, we disentangle the effects of biotic, climatic and edaphic factors (a total of 30 variables) on the global spatial distribution of SOC stocks in four sequential soil layers down to 2 m. The results indicate that the 30 variables can explain 70–80 % of the global variance of SOC in the four layers, to which edaphic properties contribute ~ 60 %. Soil lower limit is the most important individual soil properties, positively associated with SOC in all layers, while climatic variables are secondary. This dominant effect of soil properties challenges current climate-driven framework of SOC dynamics, and need to be considered to reliably project SOC changes for effective carbon management and climate change mitigation.

Zhongkui Luo and Raphael Viscarra-Rossel

 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Zhongkui Luo and Raphael Viscarra-Rossel

Zhongkui Luo and Raphael Viscarra-Rossel

Viewed

Total article views: 603 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
437 159 7 603 39 14 23
  • HTML: 437
  • PDF: 159
  • XML: 7
  • Total: 603
  • Supplement: 39
  • BibTeX: 14
  • EndNote: 23
Views and downloads (calculated since 11 Aug 2020)
Cumulative views and downloads (calculated since 11 Aug 2020)

Viewed (geographical distribution)

Total article views: 476 (including HTML, PDF, and XML) Thereof 469 with geography defined and 7 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 01 Mar 2021
Download
Short summary
We disentangled the relative importance of biotic, climatic and edaphic variables in controlling global SOC stocks. The results suggested that soil physiochemical properties are more important than climatic variables for controlling global SOC stocks, challenging current climate-driven framework of SOC dynamics.
Altmetrics