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- W1994671567 abstract "The effects of S and N deposition on leaching of ions from soil, tree growth and chemical content of needles have been studied in a lysimeter experiment. Lysimeters with Scots pine saplings were treated with artificial acid rain, in which pH was adjusted with H2SO4. Additionally, the lysimeters were treated with NH4NO3, in doses corresponding to 0, 30 and 90 kg N/ha yr. After 5 yrs of treatment, the following effects were the most pronounced: enhanced S input increased the leaching of SO42−, H+, Na+, Mg2+, Ca2+, Al, Mn2+ and NH4+ from soil. Even though a large proportion of the SO42− added was sorbed in soil, SO42− was mobile in the soil investigated. In average for all treatments, 26% of the NO3− added to the lysimeters was leached. The leaching of NH4+ was less than 5% of the amount of NH4+ applied. When treated with 90 kg N/ha yr, the leaching of both NO3− and NH4+ increased significantly, but in percent of input, the leaching of N compounds decreased. Since most of the N added was retained within the soil/plant system, the system can hardly be said to be ‘N-saturated’. Except for increased Al, H+ and NH4+ leaching, no clear relationships between the enhanced N input and leaching of other cations from soil were observed. Increased N deposition significantly increased the height of the Scots pine saplings. The height increment was accompanied by reductions in the contents of Mg, K and P in the needles. When considering the ratios MgN, KN, CaN, PN and MnN in the needles, reductions were observed with increasing N input. These reductions may be caused by dilution due to the increased growth promoted by the N application, but they could also be signals of insufficient nutrient availability in the soil. In combination with N input, enhanced S input slightly increased the concentration of NH4+ in the leachate. Combined S and N input increased the content of P in the needles relative to the lysimeters receiving high doses of N, but no S. A decreased needle Mg content following the increased N input was probably strengthened by increased Mg2+ leaching due to increased S input." @default.
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- W1994671567 date "1998-04-01" @default.
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- W1994671567 title "Effects of N and S deposition on leaching from an acid forest soil and growth of Scots pine (Pinus sylvestris L.) after 5 years of treatment" @default.
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- W1994671567 doi "https://doi.org/10.1016/s0378-1127(97)00188-6" @default.
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