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It has been assumed that nitrogen continues to be taken up by forests no matter how much is supplied. However recent studies of heavily polluted stands of Norway spruce in Germany have indicated that nitrates are not taken up by trees or by microbes in the soil. At a minimum this new finding confounds scientists` understanding of how nitrogen cycles through woodlands and it also suggests that apparently health trees can in fact be on the verge of collapse. This article examines the possible chemical explaination for this and the possible solutions.
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Janet Raloff (1995) studied this question.
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