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ARS Home » Pacific West Area » Tucson, Arizona » SWRC » Research » Publications at this Location » Publication #183907


item Emmerich, William
item Martens, Dean

Submitted to: Society of Range Management
Publication Type: Abstract Only
Publication Acceptance Date: 9/14/2005
Publication Date: 2/13/2006
Citation: Emmerich, W.E., Martens, D.A. 2006. Soil organic and inorganic carbon dioxide fluxes. Society of Range Mgmt. 59th Annual Meeting and Trade Show, Rangeland to Rainforests, Vancouver, BC Canada. 2006 CDROM.

Interpretive Summary:

Technical Abstract: Organic and inorganic forms of carbon in the soil are the second and third largest pools in the world. Arid and semiarid rangeland soils contain most of the inorganic carbon in the form of carbonates. The determination organic and inorganic carbon fluxes from soils is important in understanding the global carbon budget. Organic and inorganic carbon have different isotopic signatures. Soil carbon dioxide flux samples were collected for two years at two rangeland sites with varying soil carbonates. A procedure was developed to separate the soil fluxes into organic and inorganic sources based on their isotopic signatures. Preliminary results indicate that during the dormant season the dominate flux source was from the soil inorganics. The summer rains for the growing season apparently stimulated microbial activity in the soil to cause the organic flux to be predominate. The finding that soil carbon fluxes from soils containing carbonates are from inorganic sources for most of the year will call attention to the importance of rangeland soils in the worlds carbon budget.