Contribution of Free-Living and Attached Bacteria to Denitrification in the Hypolimnion of a Mesotrophic Japanese Lake

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概要

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• Denitrification by both free-living bacteria and those attached to particles larger than 1 μm was examined by the acetylene blockage technique in the hypolimnion of Lake Kizaki, Japan, from August to November, 1995. Bottom sediment gases (Ar, O_2,N_2,CH_4 and C0_2) were also measured at the beginning of June. Denitrification activity was detected from September to November, and ranged from 0.026 to 0.238 μM-N_2O day^<-1>. During this period, free-living bacteria accounted for 31 to 57% of total denitrification. The total number of bacterial cells ranged from 2.34 × 10^6 to 1.24 × 10^7 ml^<-1>, of which free-living bacteria accounted for 46 to 87%. High levels of N_2 in the surface sediments from both littoral and deep zones of the lake were observed, suggesting high rates of denitrification. These results show that both attached and free-living bacteria showed significant denitrification activity, with attached bacteria composing a higher proportion of the population in September in the deepest layer (28 m). Free-living denitrifiers seemed to increase from September to November with expansion upwards of the low oxygen layer.

• 日本微生物生態学会の論文
• 2000-06-30

著者

• Kato Kenji

  Laboratory of Earth Microbiology, Department of Geosciences, Faculty of Science, Shizuoka University

• Terai H

  Nagoya Univ. Nagoya Jpn

• Terai Hisayoshi

  Institute For Hydrospheric-atmospheric Science Nagoya University

• ABE DONATO

  Laboratory of Biology, ITAN, Shinshu University

• ADAMS DONALD

  Center for Earth and Environmental Sciences, Plattsburgh State University of New York

• TUNDISI JOSE

  International Institute of Ecology

• Abe D

  Laboratory Of Biology Itan Shinshu University:school Of Engineering At Sao Carlos Crhea University O

• Abe Donato

  Laboratory Of Biology School Of Allied Medical Sciences Itan Shinshu University.

• Adams Donald

  Center For Earth And Environmental Sciences Plattsburgh State University Of New York

• Kato Kenji

  Laboratory Of Biology Itan Shinshu University

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