Effects of Simulated Acid Rain on the Growth of Fir Seedlings
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概要
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Effects of simulated acid rain on the growth of three-year-old fir seedlings (<I>Abies firma</I> Siebold et Zuccarini) were investigated. In this study, the simulated acid rain consisted of 1: 1 mixture of 1 M H<SUB>2</SUB>SO<SUB>4</SUB> and 1 M HNO<SUB>3</SUB>. The seedlings were treated with the simulated acid rain of pH 2.0, 3.0, 4.0, or deionized water (Control, pH 6.7) twice a week for 30 weeks (from May 8 through Dec. 4, 1991).<BR>The red-brown visible foliar injury was observed in the seedlings treated with the rain of pH 2.0. At the middle sampling (July 31, 1991), the total fresh weight of seedlings treated with the rain of pH 2.0, 3.0, or 4.0 was significantly less than that of the control. The total dry weights of seedlings treated with the rains of pH 2.0 and 3.0 significantly reduced by 28% and 20% compared with the control, respectively. At the final sampling (Dec. 4, 1991), the total fresh and dry weights of seedlings treated with the rain of pH 2.0 significantly reduced by 23% and 29% compared with those of the control, respectively. The relative growth rate (RGR) and net assimilation rate (NAR) on plant dry weight basis during the growth period for 30 weeks were reduced corresponding to reduction of the rain pH. At the final sampling, transpiration rate in the dark, dark respiration rate and leaf sulfur content of seedlings treated with the rain of pH 2.0 significantly increased.<BR>These results suggested that the fir seedlings is sensitive to acid rain of pH 3.0 and above.
- 社団法人 大気環境学会の論文
社団法人 大気環境学会 | 論文
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