| RecYear | | Physical quantity | Year of sample collected |
| SampleID | | Nominal | unique identifier for sample with land positon_block_treatment-rep structure |
| Lan_pos | | Nominal | land position at site |
| Block | | Nominal | Blocks as defined by historical site: block B is continuous whereas block A is on either side of block B |
| Treatment | | Nominal | treatment: Control = no irrigation, irrigation = water added |
| Soil_depth | | Nominal | Soil depth increments |
| Depth_avg | | Physical quantity | average depth in cm (could not get full depth for all sampling) |
| Block2 | | Nominal | individual blocks for upland and lowland blocks A and B |
| BD_8 | | Physical quantity | bulk density of 8mm sieved soils in g/cm3 |
| BD_2 | | Physical quantity | bulk density of 2mm sieved soils in g/cm3 |
| N | | Physical quantity | bulk percent N from VELP EA at EcoCore at Colroado State University |
| C | | Physical quantity | bulk percent C from VELP EA at EcoCore at Colroado State University |
| CN | | Physical quantity | C to N ratio (percent C/percent N) |
| fPOM | | Physical quantity | percent of bulk soil that is free POM - defined as lighter than 1.85g/cm3 SPT |
| oPOM | | Physical quantity | percent of bulk soil that is occluded POM - defined as the greater than 53 µm portion of the dispersed heavier than 1.85g/cm3 SPT fraction |
| MAOM | | Physical quantity | percent of bulk soil that is MAOM - defined as the smaller than 53 µm portion of the dispersed heavier than 1.85g/cm3 SPT fraction |
| recovery | | Physical quantity | Mass recovery of soil following fractionation |
| fPOM_pN | | Physical quantity | percent in fPOM N from VELP EA at EcoCore at Colroado State University |
| fPOM_pC | | Physical quantity | percent in fPOM C from VELP EA at EcoCore at Colroado State University |
| fPOM_CN | | Physical quantity | C:N of fPOM |
| oPOM_pN | | Physical quantity | percent in oPOM N from VELP EA at EcoCore at Colroado State University |
| oPOM_pC | | Physical quantity | percent in oPOM C from VELP EA at EcoCore at Colroado State University |
| oPOM_CN | | Physical quantity | oPOM_CN |
| MAOM_pN | | Physical quantity | percent in MAOM N from VELP EA at EcoCore at Colroado State University |
| MAOM_pC | | Physical quantity | percent in MAOM C from VELP EA at EcoCore at Colroado State University |
| MAOM_CN | | Physical quantity | MC:N of MAOMAOM_CN |
| N_s | | Physical quantity | bulk N stock in gN/m² |
| C_s | | Physical quantity | bulk C stock in gC/m² |
| N_c | | Physical quantity | bulk N content in gN/kg soil |
| C_c | | Physical quantity | bulk C content in gC/kg soil |
| fP_N_c | | Physical quantity | fPOM N content in gN/kg soil |
| fP_C_c | | Physical quantity | fPOM C content in gC/kg soil |
| oP_N_c | | Physical quantity | oPOM N content in gN/kg soil |
| oP_C_c | | Physical quantity | oPOM C content in gC/kg soil |
| M_N_c | | Physical quantity | MAOM N content in gN/kg soil |
| M_C_c | | Physical quantity | MAOM C content in gC/kg soil |
| fP_N_s | | Physical quantity | fPOM N stock in gN/m² |
| fP_C_s | | Physical quantity | fPOM C stock in gC/m² |
| oP_N_s | | Physical quantity | oPOM N stock in gN/m² |
| oP_C_s | | Physical quantity | oPOM C stock in gC/m² |
| M_N_s | | Physical quantity | MAOM N stock in gN/m² |
| M_C_s | | Physical quantity | MAOM C stock in gC/m² |
| root_8 | | Physical quantity | 8mm sieved root biomass (g) |
| root_m | | Physical quantity | root mass per core volume; root volume calculated as surface area (πr^2) with corer diameter of 5.25cm multiplied by soil depth |
| root_2 | | Physical quantity | 2mm sieved root biomass (g) |
| root_lig | | Physical quantity | % lignin (acid unhydrolyzable residues) from ADF, acid digestion, and ashing - note: combined 5-15 and 15-30 depth so values in 5-15 slot are actually for 5-30cm |
| root_cell | | Physical quantity | % cellulose (α-cellulose) from ADF, acid digestion, and ashing - note: combined 5-15 and 15-30 depth so values in 5-15 slot are actually for 5-30cm |
| root_LCI | | Physical quantity | lignocellulose index (LCI) = lignin/(lignin+cellulose) - note: combined 5-15 and 15-30 depth so values in 5-15 slot are actually for 5-30cm |
| root_HWR | | Physical quantity | percent of hot water residue in roots (%) |
| GluN | | Physical quantity | glucosamine in mg/kg |
| GalN | | Physical quantity | galactosamine in mg/kg |
| MurA | | Physical quantity | muramic acid in mg/kg |
| Total_AS | | Physical quantity | sum of all amino sugars |
| GluN2MurA | | Physical quantity | glucosamine to muramic acid ratio |
| Fungal_C | | Physical quantity | calculated by subtracting mmol of bacterial GluN from total GluN with the assumption of 2:1 MurA to GluN for bacteria and a conversion of mmol to mg of 179.17 and total GluN to GluN-C of 9 - based on Jorgensen et al., 2018 and Liang et al., 2019 |
| Bacterial_C | | Physical quantity | calculated by multiplying MurA by conversion factor of 45, as in Liang et al., 2019 |
| Total_ASC | | Physical quantity | sum of fungal and bacterial C |
| FunC2SOC | | Physical quantity | fungal C in mg/kg divided by 1000 (to get g/kg) divided by percent C * 10 (to get g/kg) multiplied by 100% |
| BacC2SOC | | Physical quantity | bacterial C in mg/kg divided by 1000 (to get g/kg) divided by percent C * 10 (to get g/kg) multiplied by 100% |
| ASC2SOC | | Physical quantity | amino sugar C in mg/kg divided by 1000 (to get g/kg) divided by percent C * 10 (to get g/kg) multiplied by 100% |
| HWE_C | | Physical quantity | Hot water extractable C from roots in mg C/g root |
| HWE_N | | Physical quantity | Hot water extractable C from roots in mg N/g root |
| HWE_CN | | Physical quantity | C:N ratio of HWE |
| DOM_C | | Physical quantity | dissolved organic matter carbon in mg C/g soil |
| DOM_N | | Physical quantity | dissolved organic matter carbon in mg N/g soil |
| DOM_CN | | Physical quantity | C:N ratio of DOM |
| PostHyPy_C | | Physical quantity | percent C following hydrogen pyrolysis |
| PostHyPy_N | | Physical quantity | percent N following hydrogen pyrolysis |
| Per_SPAC | | Physical quantity | percent pyrogenic C |
| Per_SPAN | | Physical quantity | percent pyrogenic N |
| Per_SPACN | | Physical quantity | ratio of pyrogenic C to pyrogenic N |
