【摘要】 本文报道了三种土壤中水稻根际反硝化细菌的生态分布及两种作物对根际反硝化细菌的影响。结果表明:水稻各生育期菌数均以根面大于根际,又大于根外,R/S值为10—100以上。水稻与大麦的根面及根际反硝化细菌与细菌总数均以抽穗期最多,成熟期菌数明显下降,但水稻不同生育期菌数高于大麦相应时期的菌数。其优势种根面比根际者单纯;同一土壤中不同作物根面反硝化细菌优势种有明显差异;不同土壤中同一作物根面、根际反硝化细菌优势种差异不明显。更多还原

【Abstract】 The ecological distribution of denitrifying bacteria in the three soils on rhizoplane and in rhizosphere of rice and barley was studied. Results showed that the total amount of bacteria was larger on rhizoplane than in rhizosphere and non-rhizosphere soil in each growing period of rice. The ratio of R/S was above 10鈥?00. The total amounts of bacteria or denitrifying bacteria in rice and barley rhizosphere attained to the maximum during heading period, however, there was a marked dropping in ripening period. It was clear that the amount of bacteria in rhizosphere of rice was higher than that in rhizosphere of barley in each corresponding period. The dominant species of bacteria on the rhizoplane were simpler than those in rhizosphere. The dominant species of denitrifying bacteria on rhizoplane were significantly different among various crops on the same soil, but there was not significant difference in the dominant species of denitrifying bacteria on rhizoplane or in rhizosphere of a same crop on various soils.更多还原