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


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Article Info

DATE

2018-02-03

AUTHORS

Craig Rasmussen, Katherine Heckman, William R. Wieder, Marco Keiluweit, Corey R. Lawrence, Asmeret Asefaw Berhe, Joseph C. Blankinship, Susan E. Crow, Jennifer L. Druhan, Caitlin E. Hicks Pries, Erika Marin-Spiotta, Alain F. Plante, Christina Schädel, Joshua P. Schimel, Carlos A. Sierra, Aaron Thompson, Rota Wagai

ABSTRACT

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. More... »

PAGES

297-306

Journal

TITLE

Biogeochemistry

ISSUE

3

VOLUME

137

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10533-018-0424-3

DOI

http://dx.doi.org/10.1007/s10533-018-0424-3

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1100808879


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18 schema: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.
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26 Earth
27 SOM content
28 SOM cycling
29 SOM stabilization
30 SOM stabilization mechanisms
31 SOM turnover
32 acidity
33 alkaline soils
34 atmosphere
35 availability
36 best predictor
37 biogeochemical model
38 calcium
39 carbon pools
40 changes
41 clay
42 clay content
43 climate
44 conceptual understanding
45 content
46 continental
47 cycling
48 data
49 discrepancy
50 environmental changes
51 environmental gradients
52 exchangeable calcium
53 explanatory power
54 factors
55 flux
56 global scale
57 gradient
58 importance
59 improved set
60 iron
61 little explanatory power
62 matter content
63 mechanism
64 model
65 moisture availability
66 need
67 organic matter content
68 organic matter stabilization
69 parameters
70 physicochemical parameters
71 physicochemical properties
72 pool
73 power
74 predictors
75 profile
76 projections
77 properties
78 quantification
79 rate
80 relative importance
81 response
82 results
83 role
84 scale
85 set
86 soil
87 soil organic matter content
88 soil organic matter stabilization
89 soil physicochemical properties
90 soil profile
91 stabilization
92 stabilization mechanism
93 strongest predictor
94 terrestrial carbon pools
95 turnover
96 understanding
97 urgent need
98 variables
99 schema:name Beyond clay: towards an improved set of variables for predicting soil organic matter content
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