Effect of anion composition of simulated acid rain on nutrient behavior in reclaimed saline soils
2002
"Cho, J.Y. (Chonbuk National Univ., Chonju (Korea R.)) | Nishiyama, M. | Matsumoto, S. "
"The purpose of this study is to demonstrate the relative influence of the anion composition of simulated acid rain on the behavior of nutrients in three reclaimed saline soils. Reclaimed saline soil samples used for this study were collected from surface soils of the Saemangeum and Koheung soils in Korea and the Hachirogata soil in Japan. The Hachirogata soil behaved as a high variable charge soil which was derived from sediments and reclaimed from the deposits of the lake Hachirogata, while the Saemangeum and Koheung soils behaved as permanent charge soils with the cation exchange capacity (CEC) being largely independent of the pH. The simulated acid rain at pH 3.0 was prepared with nitrate-to-sulfate mol ratios of 0.75:0.25, 0.5:0.5, 0.25:0.75, and control (pH 5.7). The influence of the anion composition of simulated acid rain on the changes in the contents of nutrients in reclairned saline soils was as follows: The soil organic matter content decreased from 36.8 to 24.1 g kg**-1 for the Saemangeum soil, from 29.0 to 19.8 g kg**-1 for the Koheung soil, and from 137.7 to 85.6 g kg**-1 for the Hachirogata soil, respectively The CEC and point of zero charge (PZC) values in the Saemangeum and Koheung soils were not significantly different, whereas in the Hachirogata soil the CEC decreased by about 15% and the PZC decreased by 1.1 unit. The content of ammonia nitrogen decreased by about 20 to 30%. The content of nitrate nitrogen increased by about 10% for the Hachirogata soil but there was no appreciable difference in the case of the Saemangeum and Koheung soils."
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