![]() Our findings support the hypothesis that the present rates of NH4+ deposition in The Netherlands are detrimental to brown mosses, but not to fast-growing Sphagnum and Polytrichum species. cuspidata showed a negative relationship between external NH4+ concentrations and both tissue N and amino acid concentrations (except arginine). Sphagnum contortum showed a similar, but less marked response. commune, the highest NH4+ treatments induced strong increases in tissue nitrogen (N) and amino acid concentrations. Dry matter production and tissue cation concentrations indicated decreasing sensitivity to NH4+ in the order C. A second goal was to identify possible interspecific differences in the mechanisms responsible for NH4+ detoxification. squarrosum) and Polytrichum commune in a hydroponic experiment. To test this hypothesis, we examined the effects of varying concentrations (1–1000 mM) of NH4+ on a brown moss (Calliergonella cuspidata), two species of Sphagnum (S. We hypothesized that high ammonium (NH4+) concentrations in Dutch precipitation have promoted these species changes. ![]() In the second half of the 20th century, frequency and diversity of brown mosses strongly declined in Dutch fens while species of Sphagnum and Polytrichum increased markedly.
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