| TrtID | | Nominal | Unique ID for every sample composed of treatment (burn and fertilization) combination, plot number, and date (YYYYMMDD) |
| Plot | | Nominal | Field Plot IDs. |
| Block | | Nominal | Field Block IDs. |
| Burn | | Nominal | Plots are either annually burned (B) or unburned since 1986 (UB), B = annually burned since 1986 | UB = no fire since 1986. |
| Nadd | | Code list | C = unfertilized control, N = fertilized (10 g N as NH4NO3 per square meter per year), R = recovery (history of fertilization, but fertilization was ceased). |
| NaddBurn | | Nominal | Combination of burn (U or B) and fertilization (C or N or R) treatment. There are 6 combinations: UC, UN, UR, BC, BN, BR |
| RecMonth | | Physical quantity | Month of record |
| RecDate | | Date/time | Date that data was collected |
| Resin_NH4 | | Physical quantity | Mass of nitrogen as ammonium accumulated late April to early September in micrograms per resin bag (included only in September samples) |
| Resin_NO3 | | Physical quantity | Mass of nitrogen as nitrate accumulated late April to early September in micrograms per resin bag (included only in September samples) |
| TOC | | Physical quantity | Total extractable organic carbon in micrograms carbon per gram dry soil |
| TN | | Physical quantity | Total extractable nitrogen in micrograms nitrogen per gram dry soil |
| Soil_C | | Physical quantity | Total soil carbon as percent by weight carbon per weight dry soil |
| Soil_N | | Physical quantity | Total soil nitrogen as percent by weight nitrogen per weight dry soil |
| GWC | | Physical quantity | Gravimetric water content: field water content in grams water gram soil after drying overnight at 105 degrees C. |
| pH | | Physical quantity | Soil pH |
| NP | | Physical quantity | Nitrification potential: rate of nitrate production in saturing ammonium solution in micrograms nitrogen per gram dry soil per hour |
| N2O_none | | Physical quantity | Denitrification potential: rate of nitrous oxide production from ambient soil nutrients in micrograms nitrogen per kilogram dry soil per hour |
| N2O_CN | | Physical quantity | N2O_CN |
| Mic_Resp | | Physical quantity | Microbial respiration: rate of carbon dioxide respired from bulk soil in micrograms carbon per gram dry soil per hour |
| MBC | | Physical quantity | Microbial biomass carbon released from chloroform fumigation in micrograms carbon per gram dry soil |
| MBN | | Physical quantity | Microbial biomass nitrogen released from chloroform fumigation in micrograms nitrogen per gram dry soil |
| Arch_amoA | | Physical quantity | Archaeal amoA gene abundance in gene copy number per gram dry soil |
| Bact_amoA | | Physical quantity | Bacterial amoA gene abundance in gene copy number per gram dry soil |
| nosZ_I | | Physical quantity | nosZ clade I gene abundance in gene copy number per gram dry soil |
| nosZ_II | | Physical quantity | nosZ clade II associated with Anaeromyxobacter dehalogenans gene abundance in gene copy number per gram dry soil |
| rrn | | Physical quantity | Bacterial 16S rRNA gene abundance in gene copy number per gram dry soil |
| DNA | | Physical quantity | Quanitity of DNA in micrograms DNA per gram dry soil |
| Biosample | | Nominal | Biosample identification under NCBI Sequence Read Archive Bioproject accession PRJNA577961 (NA = not collected or samples missing) |
