| RecYear | | Physical quantity | Year of sample |
| RecDate | | Date/time | Date that data was collected |
| Shelter | | Physical quantity | Shelter number (1-14) |
| BurnTrt | | Code list | Burn treatment (1-yr burn vs. 4-yr burn) |
| DroughtTrt | | Code list | Drought treatment (control vs. drought) |
| Species | | Nominal | Species (Andropogon gerardii vs. Cornus drummondii) |
| dD | | Physical quantity | Hydrogen stable isotopic signature of plant xylem water |
| d18O | | Physical quantity | Oxygen stable isotopic signature of plant xylem water |
| Analyzer | | Nominal | Water isotope analyzer used (Picarro at KSU or Los Gatos at UPenn) |
