FUNDAMENTAL STUDIES ON DYNAMICS OF ETHYLENE IN AN ECOSYSTEM. : III. DEGRADATION CAPACITY OF ATMOSPHERIC ETHYLENE IN SOILS TAKEN FROM VARIOUS VEGETATIONS

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  • SAWADA Shinichi
    Department of Biology, Faculty of Science, Hirosaki University
  • NAKAHATA Kaname
    Department of Biology, Faculty of Science, Hirosaki University
  • TOTSUKA Tsumugu
    Division of Environmental Biology, the National Institute for Environmental Studies

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Other Title
  • 生態系におけるエチレンの動態に関する基礎的研究 : III. 数種の土壌におけるエチレンの分解能力
  • 生態系におけるエチレンの動態に関する基礎的研究-3-数種の土壌におけるエチレンの分解能力〔英文〕
  • セイタイケイ ニ オケル エチレン ノ ドウタイ ニ カンスル キソテキ ケン

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Abstract

For all the examined fresh soils taken from four different vegetations, degradation rates of ethylene (C2H4) under aerobic conditions showed logarithmic increases with the increase in atmospheric C2H4 concentration up to approximately 100 ppm. The degradation rates of the same soils air-dried were generally one-tenth lower than those of the fresh soils. At the atmospheric concentration of 30 ppmC2H4,the rates of the fresh soils of the Fagus crenata, Cryptomeria japonica and Thujopsis dolabrata forests and the paddy field examined were 150,130,60 and 5 nl/g d.w./day, respectively. Highly regular correlations were observed between theC2H4 degradation rates of the fresh soils and the amount of both the organic carbon and nitrogen in the soils. The rates determined under soil moisture ranging from 50 to 100% were approximately two times higher than those under the range from 150 to 200%. The decrease in atmospheric C2H4 concentration close to the soil surface was examined in the Cryptomeria japonica plantation by placing the vessel close to the soil surface. The decrease rates increased almost linearly with the increase of atmosphericC2H4 concentrations. The rate determined under atomosphericC2H4 concentrations of 10 ppm was 1.2×103 nl/cm2 soil surface/hr.

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