Abstract
One-year-old seedlings of red pine (Pinus densiflora Sieb. and Zucc.) were grown in typic red-yellow forest soil (Typic Hapludults) artificially adjusted to pH (H2O) 3.15, 3.60 or 3.90 by adding H2SO4 solution to the soil (pH 4.60), and exposed to ozone (03) at 150±10 ppb (nl·L−1) for 8 h a day, 6 days a week, for 16 weeks from June 5 to October 5, 1994. The control seedlings were exposed to charcoal-filtered air (CF) and grown in the soil without the additional supply of H+ as H2SO4 solution during the same period.
No significant interactive effects of O3 and soil acidification were observed for the determined seedling parameters in this study. However, O3 caused a reduction in needle dry weight, net photosynthetic rate and chlorophyll contents in the needle tip or on whole-needle weight basis, and stimulated rates of dark respiration and photorespiration. There were no significant effects of O3 on chlorophyll contents in the needle middle and basal parts, transpiration rate or water use efficiency (WUE). On the other hand, the seedlings grown in the soil adjusted to pH 3.60 or 3.90 showed a reduction in needle dry weight, net photosynthetic rate, chlorophyll contents in all the needle parts and WUE, and an increase in the rates of dark respiration and photorespiration. The transpiration rate of the seedlings was not significantly affected by soil acidification. All the seedlings grown in the soil adjusted to pH 3.15 died during the first 4 weeks. Soil and needle analysis suggested that high concentrations of Al and low Ca/Al ratios in the acidified soil were stressors.
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Shan, Y., Izuta, T., Aoki, M. et al. Effects of O3 and soil acidification, alone and in combination, on growth, gas exchange rate and chlorophyll content of red pine seedlings. Water Air Soil Pollut 97, 355–366 (1997). https://doi.org/10.1007/BF02407472
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DOI: https://doi.org/10.1007/BF02407472