21 Lec 21 Soil Carbon 1 - Part 1: Nature of organic...

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I. C cycle and significance of microorganisms to C cycling II. Nature and ease of decomposition of organic materials added to soil 1. Plant residues a) cellulose b) hemicellulose c) starches d) lignin e) secondary compounds 2. Cell walls of microorganisms Reading : Textbook: Sylvia et al., 2004. Chapter 13, pages 289-306. Soil Organic Matter Soil Organic Matter Part 1: Nature of organic materials added to soil Part 1: Nature of organic materials added to soil
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Carbon Cycle Slow cycle = long-term Fast cycle = short-term From Lal, Science, 2004 From Berner, 2004
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Carbon Cycle: Units Units: 1 ton = 1 x 10 3 Kg = 1 x 10 g
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Carbon Cycle Burning of fossil fuels Land use conversion SOILS From IPCC (intergovernmental panel on climate change), 2005
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Evolution of atmospheric CO 2 Schlesinger, Biogeochemistry. An Anaysis of Global Change. 1997. Conversion of natural to agricultural ecosystems depleted SOC - Forest clearing and firing - Cultivation of forests and prairies From Lal, Science, 2004
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From Sa et al., Soil Sci. Soc. Am. J. 65 , 1486 (2001). NT22: 22 yr of continuous no-tillage application Carbon Loss and Soil Tillage CT22: 22 yr of continuous conventional tillage CT1: 1 yr of conventional tillage CT1 CT22 NT22 CT1 CT22 NT22 CT1 CT22 NT22
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Carbon Cycle c c c c c From Coyne, Soil Microbiology, 1989 From Textbook (Sylvia et al., 2004)
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Decomposition : Breakdown of OM into smaller compounds Mineralization : Conversion of an organic form to inorganic form Decomposition of Organic Residues
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Carbon Cycle From Textbook (Sylvia et al., 2004) Nature of organic materials added to soil Decomposition of naturally occurring organic materials Humification
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This note was uploaded on 04/02/2010 for the course ESPM 131 taught by Professor Pallud during the Spring '10 term at University of California, Berkeley.

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21 Lec 21 Soil Carbon 1 - Part 1: Nature of organic...

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