1. Organic carbon CO2 Surface residues Nutrient rich POC HOC ROC TOC
2 – 0.05 mm
~ 6 yr half life
Nutrient rich
~ yr half life
POC
HOC
ROC
TOC
Buried residues
N, S, P
Stability

2. 4,500 sites across Aust, ~600 in Vic, 281 in SW Vic.
SCaRP data
Measured total carbon and the fractions of components of the total carbon.
4,500 sites across Aust, ~600 in Vic, 281 in SW Vic.
Measured cm, cm, cm

5. SCaRP data Victorian Volcanic Plains (n=227) MIR results (r2 ~ 0.86)cm
All land use types
All soil types
~70 t/ha OC
Error bars = 1 std dev
67% POC in cm
43% HOC in cm
48% ROC in cm
18%
57%
25%

6. Grazing 620 mm
Grazing & crop 607 mm
Cropping 597 mm
25%