Divergent controls on carbon concentration and persistence between forests and grasslands of the conterminous US
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Divergent controls on carbon concentration and persistence between forests and grasslands of the conterminous US K. A. Heckman . L. E. Nave . M. Bowman . A. Gallo . J. A. Hatten . L. M. Matosziuk . A. R. Possinger . M. SanClements . B. D. Strahm . T. L. Weiglein . C. Rasmussen . C. W. Swanston
Received: 6 May 2020 / Accepted: 4 November 2020 Ó This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2020
Abstract Variation in soil organic C (%OC) concentration has been associated with the concentration of reactive Fe- and Al-oxyhydroxide phases and exchangeable Ca, with the relative importance of these two stabilizing components shifting as soil pH moves from acid to alkaline. However, it is currently unknown if this pattern is similar or different with regard to measures of soil C persistence. We sampled soils from 3 horizons (uppermost A, uppermost B, C or lowest B horizons) across a pH gradient of 11 grassResponsible Editor: Samantha R. Weintraub.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10533-020-00725-z) contains supplementary material, which is available to authorized users. K. A. Heckman (&) C. W. Swanston Northern Research Station, USDA Forest Service, Houghton, MI 49931, USA e-mail: [email protected] L. E. Nave Biological Station, University of Michigan, Pellston, MI 49769, USA
dominated and 13 deciduous/mixed forest-dominated NEON sites to examine similarities and differences in the drivers of C concentration and persistence. Variation in C concentrations in all soils could be linked to abundances of Fe, Al and Ca, but were not significantly linked to variation in soil C persistence. Though pH was related to variation in D14OC, higher persistence was associated with more alkaline pH values. In forested soils, depth explained 75% of the variation in D14OC (p \ 0.0001), with no significant additional correlations with extractable metal phases. In grasslands, soil organic C persistence was not associated with exchangeable Ca concentrations, but instead was explained by depth and inorganic C concentrations (R2 = 0.76, p \ 0.0001), implying stabilization of organic C through association with carbonate M. Bowman M. SanClements INSTAAR University of Colorado, Boulder, Boulder, CO 80303, USA A. Gallo J. A. Hatten L. M. Matosziuk Forest Engineering, Resources and Management, Oregon State University, Corvallis, OR 97330, USA
L. E. Nave Dept. of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109, USA
A. R. Possinger B. D. Strahm T. L. Weiglein Department of Forest Resources and Environmental Conservation, Virginia Tech, Blacksburg, VA 24061, USA
M. Bowman Environmental Studies Program, University of Colorado, Boulder, Boulder, CO 80303, USA
M. SanClements National Ecological Observatory Network, Boulder, CO 80301, USA
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Biogeochemistry
precipitation. In grasslands, measures of substrate quality sug
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