Nutrient balance in Scots pine (Pinus sylvestris L.) forest. 2. Effects of plant growth and N-deposition on soil solution and leachate chemistry in a lysimeter experiment |
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| Authors: | G Sandvik T A Sogn G Abrahamsen |
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| Institution: | 1. Department of Soil and Water Sciences, Agricultural University of Norway, P.O.Box 5028, N-1430, ?s, Norway
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| Abstract: | Three years of N application to a Cambic arenosol (Typic Udorthent) in two lysimeter series, one with and one without young saplings of Pinus sylvestris L. have produced significant changes in soil solution and leachate chemistry. An application of 30 kg N/ha*yr?1 significantly increased NO3 ? leaching from the soil. This N load was also sufficient to significantly increase the mobility of the phyto-toxic elements Al3+ and Mn2+, likewise to increase leaching of the important plant nutrients Ca2+, Mg2+ and K+. At a N load of 90 kg N/ha*yr?1 significant increase in NH4 + leaching was observed, but total leaching of NH4 + was still very low compared to NO3 ? leaching. No significant treatment effects were found for SO4 2?, Fe2+ and Cl? in the leachate. Trees grown in the lysimeters buffered the acidifying effect of N application and increased the leachate pH by 0.2 pH units compared to lysimeters without trees. |
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