Effects of simulated acid rain on growth and physiological characteristics of Ginkgo biloba L. seedlings and on chemical properties of the tested soil. 3. Effects on chemical properties of the tested soil.
1988
Kim G.T. | Lee D.K.
One-year-old seedlings of Ginkgo biloba were treated with various simulated acid rains (pH 2.0, pH 3.0, pH 4.0 and pH 5.0) to examine the effects of simulated acid rain on the chemical properties of the tested soil. The seedlings were grown in a pot (4500cm** (3)) containing one of three different soils (nursery soil, mixed soil and sandy soil). Simulated acid rain was made by diluting sulfuric and nitric acid solution (H2SO4 : HNO3= 3 : 1, V/V) with tap water and tap water (pH 6.4), and treated by 5mm each time for three minutes during the growing seasons (April to October 1985). Acid rain treatments were done three times per week to potted seedlings by spraying the solutions. The chemical properties of potting media were compared among three soil types as well as among the various pH levels. Exchangeable calcium and magnesium contents and base saturation of the soil decreased with decreasing pH levels of acid rain, and their decreasing rates were as follows : sandy soil was the highest, followed by mixed and nursery soils. However, exchangeable aluminum content rather increased as the pH levels decreased. Available phosphate in the soil decreased as the pH levels of acid rain decreased. Its content increased in nursery soil, compared with those before acid rain treatment, but decreased in mixed and sandy soils. Soil sulfate and nitrate contents increased remarkably as the pH levels. Soil sulfate content was the highest in nursery soil, followed by mixed and sandy soils.
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