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|Title:||ALS-CXRO Seminar | Peter Nico (LBL)|
|When:||12/12/2012 3:00 PM - 4:00 PM|
|Description:||ALS-CXRO Seminar Series|
Wed, December 12, 2012
6-2202 <-- please note conf room change
The New View of Soil Carbon and Why You Should Care
The amount of carbon stored in global soils is estimated to be between 2000-3000 Pg, making soils the largest global carbon stock after carbonate rocks. Therefore, the factors that control the rate at which carbon is metabolized within the soil and released as CO2 and their sensitivity to short term and long term perturbations will have a major impact on the future of the global carbon cycle. For years, the concept of humification was the dominant mechanism assumed to control the rate of carbon decomposition in soil systems. In this understanding the more complex and aromatic the organic carbon molecule, the longer it persisted in the soil. However, humifcation theory has come under increased experimental scrutiny, and a new image of soil carbon stabilization has emerged. In the new view, the rate of soil carbon cycling is an ecosystem property as opposed to a molecular property. Our group is engaged in gathering experimental evidence to further develop this new model and unraveling the complex biotic-abiotic couplings that control soil carbon fate.