The sources and distribution of carbon (DOC,POC, DIC) in a mangrove dominated estuary (French Guiana,South America) |
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| Authors: | R Ray E Michaud R C Aller V Vantrepotte G Gleixner R Walcker J Devesa M Le Goff S Morvan G Thouzeau |
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| Institution: | 1.Department of Soil, Water and Environmental Science,The University of Arizona,Tucson,USA;2.US Forest Service Northern Research Station,Houghton,USA;3.Climate and Global Dynamics Laboratory National Center for Atmospheric Research & Institute of Arctic and Alpine Research,University of Colorado, Boulder,Boulder,USA;4.University of Massachusetts-Amherst,Amherst,USA;5.U.S. Geological Survey,Boulder,USA;6.University of California, Merced,Merced,USA;7.University of Hawaii Manoa,Honolulu,USA;8.University of Illinois Urbana-Champaign,Champaign,USA;9.Dartmouth College,Hanover,USA;10.Department of Geography,University of Wisconsin – Madison,Madison,USA;11.University of Pennsylvania,Philadelphia,USA;12.Center for Ecosystem Science and Society,Northern Arizona University,Flagstaff,USA;13.University of California – Santa Barbara,Santa Barbara,USA;14.Max Planck Institute for Biogeochemistry,Jena,Germany;15.Department of Crop and Soil Science and the Odum School of Ecology,University of Georgia,Athens,USA;16.National Agriculture and Food Research Organization, Institute for Agro-Environmental Sciences,Tsukuba,Japan |
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| 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. |
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