This paper reports a study on the distribution characteristics of bacteria, ammonifiers, ammonium-oxidizing bacteria, nitrite-oxidizing bacteria, denitrifiers, sulfatereducting bacteria, actinomycetes, and fungi in ten sediment samples from Baihua Lake (a man-made deep plateau canyon reservoir in Guizhou Province, China). In the present research, sampling site of Yueliangwan had the highest population of bacteria and sulfatereducting bacteria. Ammonifiers had the highest population at sampling site Yapengzhai while the other sampling sites showed a slight difference in the population number. Ammonium-oxidizing bacteria had the highest populaton number at sampling site Pingpu. The population number of nitrite-oxidizing bacteria in sediment at Longtan was higher than that at the other sampling sites. The highest population number of denitrifiers was at sampling site Jiangjiapu. Actionmycetes and fungi had the highest numbers at sampling sites Dachong and Laojiutu, respectively.
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