湛水前後に嫌気的に分離した細菌種の変化 (水田土壌から嫌気的に分離した細菌について-1,2-)

概要

論文の詳細を見る
Succession of strict anaerobes and facultative anaerobes in the paddy field soil was investigated before and after submersion of the field. The number of bacteria was counted on the agar plate, from which about 300 strains of bacteria were picked up at random, purified and classified. 1. At the beginning of submersion, the number of bacteria increased to 1×106/g of dry soil, as compared with that (2×105/g of dry soil) before submersion, and then the number decreased to 3×105/g of dry soil during the period of submersion. After 40 days of submersion, marked variation in number was not observed. 2. The number of facultative anaerobes was always found to be greater than that of strict anaerobes. 3. It was observed that some groups of the bacteria were affected apparently by submersion, and others were not. Before submersion, the dominant groups were comprised of Escherichia freundii, Bacillus and Clostridium, and after submersion, Aeromonas hydrophyla, Bacillus and Clostridium became dominant.