Table 1.

MPN counts of bacteria in anoxic soil of a flooded rice paddy soil microcosm

SubstrateCell count (per g of dry soil)95% Confidence intervalStrain isolated in pure culture
Lactatea3.7 × 1068.3 × 105–1.1 × 107Desulfovibriosp. strain DR10
Ethanola2.3 × 1064.4 × 105–8.3 × 106Desulfovibriosp. strain DR14
Succinate5.9 × 1059.8 × 104–2.9 × 106Desulfovibriosp. strain DR1
Betainea5.9 × 1049.8 × 103–2.9 × 105Desulfobacteriumsp. strain DR7
Ethylene glycol1.0 × 1042.0 × 103–4.4 × 104Sporomusasp. strain DR6
2,3-Butanediol1.0 × 1042.0 × 103–4.4 × 104Sporomusasp. strain DR16
3,4,5-TMBa, b2.3 × 1034.4 × 102–8.3 × 103Sporomusasp. strain DR5
  • a Three further counts with soil from different microcosms were made with these substrates (two incubated at 25°C and one incubated at 15°C); in all cases, the counts were not significantly different (P < 0.05) from those obtained in the experiments listed in the table.

  • b 3,4,5-TMB, 3,4,5-trimethoxybenzoate.