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本研究结果表明太湖地区主要水稻土中反硝化细菌常在百万/克干土以上,占细菌总数的50—80%。同一类型土壤中,肥力高者含菌数多于肥力低者。各类土壤中反硝化细菌数与细菌总数呈显著正相关。其优势种中,以巨大芽孢杆菌、荧光假单胞菌和施氏假单胞菌等出现的机率最高,占反硝化细菌的10—50%;地衣芽孢杆菌及坚强芽孢杆菌等出现的机率较少。具有使NO_3~-还原为N_2O的菌株和使N_2O还原为N_2的菌株,分别占供试菌株的67%和56%;使~(15)NO_3~-异化还原为~(15)NH_4~+的菌株占供试菌株的92%,其中以蜡质芽孢杆菌和地衣芽孢杆菌的这种能力特别强。
The results of this study indicate that the denitrifying bacteria in the main paddy soils in the Taihu Lake region are often above 1 million dry grit, accounting for 50-80% of the total bacterial population. In the same type of soil, the higher fertility bacteria contained more bacteria than the lower fertility. The number of denitrifying bacteria in all kinds of soils was significantly and positively correlated with the total number of bacteria. Among the dominant species, Bacillus megaterium, Pseudomonas fluorescens and Pseudomonas stutzeri appeared the highest probability, which accounted for 10-50% of the total amount of denitrifying bacteria. Bacillus licheniformis and Bacillus firmi appeared more frequently less. The strain with NO_3 ~ - reduced to N_2O and the strain with N_2O reduced to N_2 accounted for 67% and 56% of the tested strains, respectively; and the ~ (15) NO_3 ~ - reduced to ~ (15) NH_4 ~ + Strains accounted for 92% of the tested strains, of which Bacillus cereus and Bacillus licheniformis are particularly capable.