Abstract

Investigations into the rate of atmospheric nitrogen deposition, of nitrogen recycling by litter and of nitrogen concentration levels in seepage water under different coniferous and broad-leaved tree stands in South-West Germany prove that the nitrogen status (e.g. input, turnover, balance) of the studied ecosystems is quite different from each other. The evident differences, presumably caused to a great deal by recent increase in deposition rates, is expressed by indicator species of ground vegetation only with delay and at a restricted scale. The species involved are correlated with more persistent site factors (e.g. soil reaction, buffer state, humus type), that do change only in a longer term. Species will show adapted reactions as their physiological reaction pattern is much greater than the ecological range in which they are normally present in actual forest vegetation types

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