Svampe 42: 53-60, 2000
Nitrogen deposition and decline of fungi on poor and sandy soils

Vesterholt, J., Asman, W.A.H., Christensen, M.

The levels of nitrogen deposit show considerable regional variation in Denmark, and the factors responsible for this pattern are briefly discussed. Several species of mycorrhizal fungi growing on poor and sandy soils have shown a serious decline in Denmark. The changes in the geographical distribution patterns of *Bankera fuligineoalba, Hydnellem aurantiacum, H. ferrugineum, H. peckii, Phellodon tomentosus and Tricholoma focale are compared to the levels of nitrogen deposition. It appears that the six species in question largely have disappeared from all areas with an annual deposit exceeding about 15 kg N/ha/year. This supports the assumption that eutrophication by nitrogen deposition could be an important causal factor in the decline of a group of mycorrhizal fungus species on poor and sandy soils.

*Pjusket Duftpigsvamp, Orange Korkpigsvamp, Rust-Korkpigsvamp, Bitter Korkpigsvamp, Tragtformet Læderpigsvamp, Halsbånd-Ridderhat