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Beyond clay: towards an improved set of variables for predicting soil organic matter content

Biogeochemistry, 2018-02, Vol.137 (3), p.297-306 [Peer Reviewed Journal]

Springer International Publishing AG, part of Springer Nature 2018 ;Biogeochemistry is a copyright of Springer, (2018). All Rights Reserved. ;ISSN: 0168-2563 ;EISSN: 1573-515X ;DOI: 10.1007/s10533-018-0424-3

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Title:
Beyond clay: towards an improved set of variables for predicting soil organic matter content
Author: Rasmussen, Craig ; Heckman, Katherine ; Wieder, William R. ; Keiluweit, Marco ; Lawrence, Corey R. ; Berhe, Asmeret Asefaw ; Blankinship, Joseph C. ; Crow, Susan E. ; Druhan, Jennifer L. ; Pries, Caitlin E. Hicks ; Marin-Spiotta, Erika ; Plante, Alain F. ; Schädel, Christina ; Schimel, Joshua P. ; Sierra, Carlos A. ; Thompson, Aaron ; Wagai, Rota
Subjects: Acidity ; Alkaline soils ; Aluminium ; Aluminum ; Atmospheric models ; Biogeochemistry ; BIOGEOCHEMISTRY LETTERS ; Biogeosciences ; Calcium ; Carbon cycle ; Carbon dioxide ; Clay ; Climate ; Cycles ; Earth ; Earth and Environmental Science ; Earth Sciences ; Ecosystems ; Environment models ; Environmental changes ; Environmental Chemistry ; Environmental gradient ; Environmental Sciences & Ecology ; Fluxes ; Geology ; Iron ; Life Sciences ; Moisture availability ; Organic matter ; Organic soils ; Physicochemical processes ; Physicochemical properties ; Predictive control ; Profiles ; Soil ; Soil moisture ; Soil organic matter ; Soil profiles ; Soil properties ; Soil stabilization ; Soil water ; Stabilization ; Terrestrial environments
Is Part Of: Biogeochemistry, 2018-02, Vol.137 (3), p.297-306
Description: Improved quantification of the factors controlling soil organic matter (SOM) stabilization at continental to global scales is needed to inform projections of the largest actively cycling terrestrial carbon pool on Earth, and its response to environmental change. Biogeochemical models rely almost exclusively on clay content to modify rates of SOM turnover and fluxes of climate-active CO₂ to the atmosphere. Emerging conceptual understanding, however, suggests other soil physicochemical properties may predict SOM stabilization better than clay content. We addressed this discrepancy by synthesizing data from over 5,500 soil profiles spanning continental scale environmental gradients. Here, we demonstrate that other physicochemical parameters are much stronger predictors of SOM content, with clay content having relatively little explanatory power. We show that exchangeable calcium strongly predicted SOM content in water-limited, alkaline soils, whereas with increasing moisture availability and acidity, iron- and aluminum-oxyhydroxides emerged as better predictors, demonstrating that the relative importance of SOM stabilization mechanisms scales with climate and acidity. These results highlight the urgent need to modify biogeochemical models to better reflect the role of soil physicochemical properties in SOM cycling.
Publisher: Cham: Springer Science + Business Media
Language: English
Identifier: ISSN: 0168-2563
EISSN: 1573-515X
DOI: 10.1007/s10533-018-0424-3
Source: AUTh Library subscriptions: ProQuest Central

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Beyond clay: towards an improved set of variables for predicting soil organic matter content

Springer International Publishing AG, part of Springer Nature 2018 ;Biogeochemistry is a copyright of Springer, (2018). All Rights Reserved. ;ISSN: 0168-2563 ;EISSN: 1573-515X ;DOI: 10.1007/s10533-018-0424-3

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