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Week 7 - Module 2 (Lec 17) (What affects SOC levels? (Climate, temp,…
Week 7 - Module 2 (Lec 17)
Soil Carbon and Soil carbon cycling
Plant biomass
Soil
Interactions of multiple cycles
Nitrogen
Phosphorous
Carbon
Soil Organic carbon
different soils contain different amounts of carbon
Carbon is typically concentrated near the surface
Soil Carbon usually reported as stock
Soil carbon can be expressed as % Soil Organic Matter
living and non-living components
belowground fauna and roots, microbial biomass
active, slow pools or humic or non-humic
SOC levels
Balance of C inputs and outputs
Plants and animals
decomposable organic residues
Soil Biomass
Humus
Soil Health = living organisms and roots
Biological
Chemical compound class
Plant-derived carbon
Microbial origin
biological sources
2/3 of carbon is stored in soil
Inorganic and organic forms
more organic supplied through root growth, litter fall, decaying materials, etc
What affects SOC levels?
Climate, temp, moisture
vegetation type
Soil texture and type of clay and oxides
Topography
Land use
rotation, tillage
Time
Reducing SOC loss
Crop management
Conservation tillage
Haber Bosch