| Sample_ID | | Nominal | Unique identifier for each sample |
| RecYear | | Physical quantity | Year in which soil sample was collected |
| Watershed | | Code list | Name of watershed where sample was collected |
| Transect | | Nominal | Sampling transect (corresponds with PVC02 dataset) |
| Burn | | Code list | Watershed-level burn treatment |
| Graze | | Code list | Watershed-level grazing treatment |
| d15N | | Physical quantity | δ15N value of soil sample |
| N_percent | | Physical quantity | Soil nitrogen concentration |
| d13C | | Physical quantity | δ13C value of soil sample |
| C_percent | | Physical quantity | soil carbon concentration |
