| RecYear | | Physical quantity | Year of record |
| Watershed | | Nominal | watershed |
| plant_group | | Nominal | plant functional groups |
| perc_N | | Physical quantity | Percent concentration of the N element. |
| perc_C | | Physical quantity | Percent concentration of the C element. |
| perc_H | | Physical quantity | Percent concentration of the H element. |
| ppm_Al | | Physical quantity | Parts per million (ppm) of the Al element. |
| ppm_As | | Physical quantity | Parts per million (ppm) of the As element. |
| ppm_B | | Physical quantity | Parts per million (ppm) of the B element. |
| ppm_Ba | | Physical quantity | Parts per million (ppm) of the Ba element. |
| ppm_Be | | Physical quantity | Parts per million (ppm) of the Be element. |
| ppm_Ca | | Physical quantity | Parts per million (ppm) of the Ca element. |
| ppm_Cd | | Physical quantity | Parts per million (ppm) of the Cd element. |
| ppm_Co | | Physical quantity | Parts per million (ppm) of the Co element. |
| ppm_Cr | | Physical quantity | Parts per million (ppm) of the Cr element. |
| ppm_Cu | | Physical quantity | Parts per million (ppm) of the Cu element. |
| ppm_Fe | | Physical quantity | Parts per million (ppm) of the Fe element. |
| ppm_K | | Physical quantity | Parts per million (ppm) of the K element. |
| ppm_Li | | Physical quantity | Parts per million (ppm) of the Li element. |
| ppm_Mg | | Physical quantity | Parts per million (ppm) of the Mg element. |
| ppm_Mn | | Physical quantity | Parts per million (ppm) of the Mn element. |
| ppm_Mo | | Physical quantity | Parts per million (ppm) of the Mo element. |
| ppm_Na | | Physical quantity | Parts per million (ppm) of the Na element. |
| ppm_Ni | | Physical quantity | Parts per million (ppm) of the Ni element. |
| ppm_P | | Physical quantity | Parts per million (ppm) of the P element. |
| ppm_Pb | | Physical quantity | Parts per million (ppm) of the Pb element. |
| ppm_S | | Physical quantity | Parts per million (ppm) of the S element. |
| ppm_Si | | Physical quantity | Parts per million (ppm) of the Si element. |
| ppm_Ti | | Physical quantity | Parts per million (ppm) of the Ti element. |
| ppm_V | | Physical quantity | Parts per million (ppm) of the V element. |
| ppm_Zn | | Physical quantity | Parts per million (ppm) of the Zn element. |
