Dry Weight Growth of Japanese Cedar Seedlings Grown in Artificially Acidified Brown Forest Soils.
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Dry weight growth of Japanese cedar (<I>Cryptomeria japonica</I> D. Don) seedlings grown in artificially acidified brown forest soils was investigated in relation to pH, concentration of water-soluble Al or (Ca+Mg+K)/Al molar ratio in the soils.<BR>Brown forest soils originated from volcanic ash, granite or sandstone and slate were used as soil materials The H+ of 10, 30, 60 and 100 meq was added as H<SUB>2</SUB>SO<SUB>4</SUB> solution to IL of soils, but not to the control soils. Two-year-old seedlings were transplanted in the control and acidified soils, and were grown in a greenhouse for 12 weeks from 13 June to 5 September, 1994.<BR>The dry weight growth of the seedlings grown in the brown forest soils was reduced with decreasing in the soil pH (H<SUB>2</SUB>O). However, the growth reduction was considered to be caused by an increace in the concentration of water-soluble Al in the soils. The growth of the seedlings grown in the soil from volcanic ash was reduced when the concentration of water-soluble Al in the soil increased above 10.5μg/g on the basis of air-dried soil, and that of the seedlings grown in the other soils was reduced when the Al concentration increased above 30μg/g. The growth of the seedlings grown in the soils from volcanic ash and granite was reduced when the (Ca + Mg +K)/Al molar ratio in the soils decreased below 5, but that of the seedlings grown in the soil from sandstone and slate was reduced when the molar ratio in the soil was 9.21 or blow, and the concentration of water-soluble Al in the soil of this plot was 37.8μg/g.<BR>The results obtained in this study show that the dry weight growth of Japanese cedar seedlings grown in the brown forest soils acidified by adding H<SUB>2</SUB>SO<SUB>4</SUB> solution is reduced regardless of the concentration of watersoluble base cation in the soils when the concentration of water-soluble Al in the soils is above 30μg/g, and that is reduced when the (Ca + Mg + K)/Al molar ratio is below 5 even though the Al concentration is below 30μg/g.
- 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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