Table 2.

Abundance of predominant physiological groups of bacteria in earth materials.

Physiological groups of bacteria, cells/g	Ugolniy-1		Ugolniy-2	Shanduy
	U-1	U-2	U-3	Sh-1
Saprophytic bacteria, aerobes	6.4 × 104	5.2 × 104	9.7 × 104	8.7 × 104
Saprophytic bacteria, anaerobes	1.3 × 104	7.8 × 103	7.7 × 104	1.2 × 104
Nitrogen-fixing bacteria	4.1 × 103	7.4 × 103	3.2 × 104	0
Ammonifying bacteria	3.0 × 104	1.5 × 104	8.1 × 103	1.1 × 104
Heterotrophic nitrifiers	5.9 × 104	3.2 × 104	8.4 × 104	1.2 × 103
Denitrifiers	4.5 × 103	2.5 × 102	4.5 × 102	5.5 × 102
Sulfur-reducing bacteria	0	0	2.5 × 102	1.5 × 105
Iron-oxidizing bacteria, heterotrophs	2.7 × 102	0	1.4 × 102	6.1 × 103
Manganese-oxidizing bacteria, heterotrophs	0.4 × 102	1.5 × 104	6.1 × 102	4.1 × 103
Silicate bacteria	2.2 × 104	1.2 × 104	1.1 × 104	1.0 × 104