Pedosphere 23(6): 808--814, 2013
ISSN 1002-0160/CN 32-1315/P
©2013 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Potential contribution of combined atmospheric Ca2+ and Mg2+ wet deposition within the continental U.S. to soil inorganic carbon sequestration |
E. A. MIKHAILOVA1 , M. A. GODDARD1, C. J. POST1, M. A. SCHLAUTMAN2 and J. M. GALBRAITH3 |
1School of Agricultural, Forest, and Environmental Sciences, Clemson University, Clemson SC 29634 (USA)
2Department of Environmental Engineering and Earth Sciences, Clemson University, Anderson SC 29625 (USA)
3Department of Crop and Soil Environmental Sciences, Virginia Tech, Blacksburg VA 24061 (USA) |
| ABSTRACT |
| Soil inorganic carbon (SIC) stocks continuously change from the formation of pedogenic carbonates, a process requiring inputs of Ca2+ and Mg2+ ions. This study ranked the soil orders in terms of potential inorganic carbon sequestration resulting from wet Ca2+ and Mg2+ deposition from 1994 to 2003 within the continental United States. The analysis revealed that average annual atmospheric wet deposition of Ca2+ and Mg2+ was the highest in the Central Midwest-Great Plains region, likely due to soil particle input from loess-derived soils. The soil orders receiving the highest total average annual atmospheric wet Ca2+ and Mg2+ deposition, expressed as potential inorganic carbon formation (barring losses from erosion and leaching), were: 1) Mollisols (1.1 × 108 kg C), 2) Alfisols (8.4 × 107 kg C), 3) Entisols (3.8 × 107 kg C), and 4) Aridisols (2.8 × 107 kg C). In terms of area-normalized result, the soil orders were ranked: 1) Histosols (73 kg C km-2), 2) Alfisols and Vertisols (64 kg C km-2), 3) Mollisols (62 kg C km-2), and 4) Spodosols (52 kg C km-2). The results of this study provide an estimate of potential soil inorganic carbon sequestration as a result of atmospheric wet Ca2+ and Mg2+ deposition, and this information may be useful in assessing dynamic nature of soil inorganic carbon pools. |
| Key Words: calcite, carbon cycle, dolomite, pedogenic |
| Citation: Mikhailova, E. A., Goddard, M. A., Post, C. J., Schlautman, M. A. and Galbraith, J. M. 2013. Potential contribution of combined atmospheric Ca2+ and Mg2+ wet deposition within the continental U.S. to soil inorganic carbon sequestration. Pedosphere. 23(6): 808-814. |
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