Effects of simulated acid rain on growth and contents of chemical substances in needles of Pinus koraiensis seedlings and on chemical properties of the tested soil
1987
Cheong, Y.M. (Yesan National Agricultural Junior Coll., Yesan (Korea R.))
Simulated acid rain (pH 4.0, pH 2.0) containing sulfuric and nitric acid in the ratio of 60:40 (chemical equivalent basis) diluted with underground water, and underground water (pH 6.5) as control were treated on potted Pinus koraiensis seeds during the growing season (May 1 to August 31) in 1985. The regime of artificial acid rain, in terms of spray frequency and amount per plot, was simulated on the basis of climatological data averaged for 30 years of records. The seedling growth, contents of chemical substances in needles and chemical properties of the tested soil were compared among the various pH levels of acid rain on October 31, 1985. Following results were obtained. With decreasing pH levels of acid rain, S and K2O contents in leaf tissue increased, but MgO and P2O5 contents decreased. Soil pH dropped, and exchangeable aluminum content in the tested soil dramatically increased as the pH levels of acid rain decreased. Exchangeable calcium, magnesium, potassium contents, and base saturation degree of the soil significantly decreased with decreasing pH levels of acid rain. Sulfate concentrations in the soil significantly increased as rain pH decreased, but total nitrogen and available phosphate contents were not influenced by acid rain
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