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 NO 3 - leaching from the soil. This N load was also sufficient to significantly increase the mobility of the phyto-toxic elements Al 3+ and Mn 2+ , likewise to increase leaching of the important plant nutrients Ca 2+ , Mg 2+ and K + . At a N load of 90 kg N/ha*yr -1 significant increase in NH 4 + leaching was observed, but total leaching of NH 4 + was still very low compared to NO 3 - leaching. No significant treatment effects were found for SO 4 2- , Fe 2+ 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.
Published Version
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