Table 6.
Well recognised nitrogen-fixing bacterial communities in different region in the world
| Study regions | Average soil pH | Dominant phyla | Predominant genera | Reference |
|---|---|---|---|---|
| Antarctica-wetted soil | 8.48 | α-Proteobacteria | Geobacter | [53] |
| β-Proteobacteria | ||||
| γ-Proteobacteria | ||||
| δ-Proteobacteria | ||||
| Cyanobacteria | ||||
| Antarctica microbial mat | 9.90 | β-Proteobacteria | Azotobacter | [68] |
| γ-Proteobacteria | ||||
| δ-Proteobacteria | ||||
| Firmicutes | ||||
| Spirochaetes | ||||
| Cyanobacteria | ||||
| Verrucomicrobia | ||||
| Unidentified cluster | ||||
| Canadian Arctic scrubland soil | – | α-Proteobacteria | Rhodopseudomonas | [54] |
| β-Proteobacteria | ||||
| γ-Proteobacteria | ||||
| Firmicutes | ||||
| Unidentified cluster | ||||
| Arctic tundra soil | 6.70 | α-Proteobacteria | Rhodopseudomonas | [55] |
| γ-Proteobacteria | ||||
| δ-Proteobacteria | ||||
| Spirochaetes | ||||
| Cyanobacteria | ||||
| Spirochaetes | ||||
| Unidentified cluster | ||||
| Tibetan plateau alpine prairie soil | 7.43 | α-Proteobacteria | Methylocella | [56] |
| β-Proteobacteria | ||||
| γ-Proteobacteria | ||||
| δ-Proteobacteria | ||||
| Unidentified cluster | ||||
| Qilian mountains scrubland and meadow soil | 7.04 | α-Proteobacteria | Bradyrhizobium | [25] |
| β-Proteobacteria | ||||
| γ-Proteobacteria | ||||
| Unidentified cluster | ||||
| Polish agriculture soils | 5.51 | α-Proteobacteria | Burkholderia | This study |
| β-Proteobacteria | ||||
| Polish wastelands soils | 6.15 | α-Proteobacteria | Burkholderia | |
| β-Proteobacteria |