Long-Term Effects of Simulated Acid Fog on Visible Injury, Growth, Chlorophyll and Nitrogen Content of Japanese Cedar, Red Pine and Beech Seedlings

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  • SILWAL Saubhagya
    <I>United Graduated School of Agricultural Science, Tokyo University of Agriculture and Technology</I>
  • AOKI Masatoshi
    <I>United Graduated School of Agricultural Science, Tokyo University of Agriculture and Technology</I>
  • HORIE Katsutoshi
    <I>United Graduated School of Agricultural Science, Tokyo University of Agriculture and Technology</I>

Bibliographic Information

Other Title
  • 3種の樹木苗に対する人工酸性霧暴露の長期的な影響

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Abstract

Seedlings of three tree species, Japanese cedar, red pine and beech, grown in plastic green houses were subjected to a simulated acid fog adjusted to pH values of 2, 3 and 4 and to distilled water (the control), during the growing season from 1998 to 2001, and effects on visible injury, growth, foliage chlorophyll and nitrogen contents were studied. In cedar and pine, an increase in total dry weight (TDW) was accelerated by acid fog of pH2 and pH3 with increasing duration of treated years, although a trend of growth inhibition of TDW was observed in beech. The stimulated growth in cedar of pH2 and pH3 plots resulted in death of 29 to 45% of plants. Foliage nitrogen and chlorophyll content in beech were severely affected than in cedar and pine. On the other hand, foliar injury in pine and cedar by acid fog exposure was higher in lower pH plots and the injury increased with increasing duration of treated years. In contrast, in beech, the injury increased with the decreasing acid fog pH, but wasn't accelerated by increase in duration of treated years. Thus, response of tree seedlings to simulated acid fog was found to be quite complex depending on species and duration of treated years.

Journal

  • Environment Control in Biology

    Environment Control in Biology 42 (1), 41-55, 2004

    Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists

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