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Effect of nitrogen on drought resistance of Norway spruce and Scots pine


Effect of nitrogen on drought resistance of Norway spruce and Scots pine



Science of the Total Environment 96(1-2): 189-198



ISSN/ISBN: 0048-9697

DOI: 10.1016/0048-9697(90)90017-o

Six fertilization experiments in mature spruce and pine stands were analyzed for growth response during two successive extremely dry summers, to evaluate the hypothesis that nitrogen deposition increases canopy growth and water demand, leaving the trees less drought resistant. Nitrogen had been applied at rates varying from a single application of 150 kg ha-1, up to repeated applications of 600 kg ha-1. The last application was 2-5 years before the drought. In two experiments, growth showed a slight depression during one of the two dry years, compared with what would be expected as normal. The growth depression was rather small and absolute growth was far greater than that of the control tress. In the other four experiments, no signs of deviation from normal growth were detected. The study indicates that the present level of nitrogen deposition in southern Norway has not significantly reduced the drought resistance of spruce and pine forests.

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Accession: 002084704

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Related references

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