11 Aug 2020
11 Aug 2020
Soil properties override climate controls on global soil organic carbon stocks
- 1College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, China
- 2School of Molecular & Life Sciences, Curtin University, Perth, WA 6845, Australia
- 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.
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Zhongkui Luo and Raphael Viscarra-Rossel


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RC1: 'Review BG_2020_298', Anonymous Referee #1, 16 Oct 2020
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AC1: 'Response to review comments', Zhongkui Luo, 05 Nov 2020
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AC1: 'Response to review comments', Zhongkui Luo, 05 Nov 2020
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RC2: 'Review of Luo and Viscarra-Rossel', Anonymous Referee #2, 26 Oct 2020
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AC2: 'Responses to review comments', Zhongkui Luo, 05 Nov 2020
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AC2: 'Responses to review comments', Zhongkui Luo, 05 Nov 2020


-
RC1: 'Review BG_2020_298', Anonymous Referee #1, 16 Oct 2020
-
AC1: 'Response to review comments', Zhongkui Luo, 05 Nov 2020
-
AC1: 'Response to review comments', Zhongkui Luo, 05 Nov 2020
-
RC2: 'Review of Luo and Viscarra-Rossel', Anonymous Referee #2, 26 Oct 2020
-
AC2: 'Responses to review comments', Zhongkui Luo, 05 Nov 2020
-
AC2: 'Responses to review comments', Zhongkui Luo, 05 Nov 2020
Zhongkui Luo and Raphael Viscarra-Rossel
Zhongkui Luo and Raphael Viscarra-Rossel
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