Figure : processes-involved-in-controlling-fluxes-and-stabilization-of-soil-carbon

Processes Involved in Controlling Fluxes and Stabilization of Soil Carbon

Figure 12.1

Oregon State University
Kate Lajtha

This figure appears in chapter 12 of the Second State of the Carbon Cycle Report (SOCCR2): A Sustained Assessment Report report.

A variety of soil animals and microbes can process plant litter that contributes to a pool of unprotected particulate organic matter (OM) with a relatively short turnover time. Alternatively, soil microbes also can process this litter into more stabilized forms such as aggregates or mineral-protected OM with relatively long turnover times. In this carbon pool, belowground litter appears to be preferentially stabilized, partly because of its proximity to both microbes and minerals. Root exudates may contribute to microbial carbon pools or to priming (i.e., the loss of mineral-protected soil carbon). Respiratory losses—occurring at all stages of biotic processing—can be affected by microbial carbon use efficiency and by conditions in the natural environment or those arising from land use. Not only can land use significantly affect both the quality and quantity of plant residues delivered to soils and their processing, it also can affect erosional losses and deposition. Climate change, especially in northern latitudes, may cause significant losses of soil carbon. (Key: CO2, carbon dioxide; CH4, methane.)

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This figure was created on February 06, 2018.

This figure was submitted on February 11, 2019.

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