The correct order of soil horizons is:
| LIST I - Ecological Parameters | LIST II - Unit of Measurement |
|---|---|
| A. Net primary productivity | I. g/m2 |
| B. Absorbed photosynthetically active radiation | II. g/L |
| C. Phosphorus | III. Joules/area/year |
| D. Plant biomass | IV. gC/area/year |