CARBON SEQUESTRATION BY SOIL CARBONATE—CLASSIFICATION AND GENESIS (POSTER) H

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Carbon Sequestration by Soil Carbonate—Classification and Genesis

Carbon Sequestration by Soil Carbonate—Classification and Genesis

(poster)

H. Curtis Monger¹, Rebecca A. Kraimer², and Sa’eb A. Khresat³.

¹New Mexico State University, Las Cruces, NM ([email protected]); ²Natural Resources Conservation Service, Las Cruces, NM; ³Jordan University of Science and Technology, Irbid, Jordan.

Globally, soil carbonate contains at least 800 x 10¹⁵ grams of carbon, which exceeds the amount of carbon in the atmosphere (ca. 750 x 10¹⁵ grams) or the amount in land plants (ca. 560 x 10¹⁵ grams). Although the chemistry of carbonate dissolution/precipitation has been understood for over a century, the role of soil carbonate in the sequestration of atmospheric carbon dioxide is deceptively complex and is hampered by the lack of a classification system. We present a classification system that is based on the point at which carbonate precipitated and the source of Ca²⁺. The major classification categories of this system are in situ or ex situ pedogenic, non-pedogenic (i.e., geogenic), calcic-pedogenic, and silicatic-pedogenic carbonate. This classification reveals that all soil carbonate contains sequestered atmospheric CO₂. The question is where and when was it sequestered. For example, soil carbonate in the form of silt-size limestone particles eroded from Permian coral-reef bedrock would classify as “Ex situ non-pedogenic carbonate” and would contain carbon sequestered from the Permian rather than the modern atmosphere. Such distinctions are important for understanding the global carbon cycle and designing terrestrial carbon storage projects.

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Tags: (poster) h., genesis, sequestration, carbonate—classification, carbon, (poster)