Table 2.
Diagnosis of all variables with missing data in the global dataset.
| Variable | Data type | Missing count | Missing (%) | Unique count |
|---|---|---|---|---|
| ID | numeric | 0 | 0.0 | 1552 |
| Authors* | character | 0 | 0.0 | 205 |
| Year | numeric | 0 | 0.0 | 31 |
| Publication | character | 0 | 0.0 | 331 |
| Journal | character | 0 | 0.0 | 75 |
| DOI | character | 17 | 1.1 | 326 |
| LONDD | numeric | 0 | 0.0 | 581 |
| LATDD | numeric | 0 | 0.0 | 603 |
| Climate | character | 1067 | 68.8 | 58 |
| Elevation | numeric | 1020 | 65.7 | 150 |
| MAP | numeric | 376 | 24.2 | 286 |
| MAT | numeric | 525 | 33.8 | 173 |
| KC18_MAP | numeric | 0 | 0.0 | 491 |
| KC18_MAT | numeric | 0 | 0.0 | 527 |
| KC18_main | character | 0 | 0.0 | 5 |
| KC18_sub | character | 0 | 0.0 | 23 |
| Ecosystem | character | 6 | 0.4 | 8 |
| Plant_dominant | character | 386 | 24.9 | 382 |
| Biome | character | 0 | 0.0 | 9 |
| Bio_leaf_grow | character | 861 | 55.5 | 16 |
| Bio_leaf_long | character | 876 | 56.4 | 16 |
| Leaf_grow | character | 861 | 55.5 | 6 |
| Leaf_long | character | 876 | 56.4 | 6 |
| Study_type | character | 0 | 0.0 | 2 |
| Ambient_N | numeric | 1306 | 84.1 | 66 |
| N_fertilized | logical | 0 | 0.0 | 2 |
| Soil_class | character | 398 | 25.6 | 271 |
| WRB_rsg | character | 16 | 1.0 | 30 |
| WRB_1qual | character | 53 | 3.4 | 73 |
| Soil_horiz | character | 0 | 0.0 | 3 |
| Top_cm | numeric | 84 | 5.4 | 19 |
| Bottom_cm | numeric | 84 | 5.4 | 40 |
| Soil_layer | character | 82 | 5.3 | 3 |
| Clay_orig | numeric | 899 | 57.9 | 54 |
| Silt_orig | numeric | 945 | 60.9 | 75 |
| Sand_orig | numeric | 937 | 60.4 | 88 |
| Soil_texture_orig | character | 709 | 45.7 | 27 |
| Clay_perc | numeric | 945 | 60.9 | 52 |
| Silt_perc | numeric | 945 | 60.9 | 78 |
| Sand_perc | numeric | 945 | 60.9 | 90 |
| Soil_texture_class | character | 669 | 43.1 | 13 |
| WHC | numeric | 898 | 57.9 | 35 |
| WFPS | numeric | 362 | 23.3 | 87 |
| Soil_pH | numeric | 0 | 0.0 | 67 |
| Soil_pH_class | character | 0 | 0.0 | 9 |
| TOC | numeric | 138 | 8.9 | 597 |
| TN | numeric | 235 | 15.1 | 180 |
| C_N | numeric | 213 | 13.7 | 259 |
| Ammonium | numeric | 650 | 41.9 | 261 |
| Nitrate | numeric | 651 | 41.9 | 305 |
| MBC | numeric | 1201 | 77.4 | 297 |
| MBN | numeric | 1150 | 74.1 | 229 |
| MBC_N | numeric | 1286 | 82.9 | 134 |
| NNM | numeric | 1171 | 75.5 | 287 |
| NNR | numeric | 1204 | 77.6 | 248 |
| GNM | numeric | 105 | 6.8 | 818 |
| GNR | numeric | 286 | 18.4 | 612 |
| GNRa | numeric | 1191 | 76.7 | 260 |
| GNRh | numeric | 1207 | 77.8 | 127 |
| DNRA | numeric | 1157 | 74.5 | 100 |
| INH4 | numeric | 658 | 42.4 | 522 |
| INO3 | numeric | 744 | 47.9 | 286 |
| INN | numeric | 755 | 48.6 | 533 |
This summary table was created by a data diagnostic function in R ‘dlookr’ package26.
*Variable was filled by the last name of the first author, followed by ‘et al.’ if more than or equal to three authors, or the last names of both authors for two author papers. Note that some last names are in the exact same spelling. Please refer to the metadata of the dataset for more variable descriptions19.