T13+Slides

T13+Slides - organic matter + oxygen = carbon dioxide +...

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1 39,000 C 6 H 12 O 6 + 6O 2 = 6CO 2 + 6H 2 O + energy organic matter + oxygen = carbon dioxide + water Respiration Photosynthesis Terrestrial Carbon Cycling Soil Food Web Raw litter Humus Humus: a complex and resistant mixture of colloidal (microscopic) organic matter formed from microbial decomposition and microbial synthesis products What is soil organic matter composed of?
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2 Soil Organic Matter Concentrations in the USA What factors affect soil organic matter concentrations? Production by vegetation minus losses by decomposition Climate is the primary driver of organic matter production What determines the rate of decomposition? Composition of organic matter inputs (organic chemistry) Environmental factors Glucose Sucrose Cellulose Tannins Lignin
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3 Decomposability Sugar, starch, simple proteins Crude proteins Hemicellulose Cellulose Fats, waxes, tannins Lignin Rapid decomposition Very slow decomposition Grass Clippings Pine Needles Simple proteins and carbohydrates are consumed
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T13+Slides - organic matter + oxygen = carbon dioxide +...

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