Die Beziehung zwischen Nährelementkonzentrationen der Feinstwurzeln und dem Vorkommen der Ektomykorrhizen

Abstract

Mycorrhizal parameters are highly sensitive to environmental conditions. In two Scots pine stands impacted by different atmospheric nitrogen deposition in the lowlands of northeastern Germany we measured the nutrient content of fine roots as habitat parameter of mycorrhizal types. This kind of investigations can elucidate the ecological strategies of ectomycorrhizal fungi. The occurance of euryoecious species like Xerocomus badius, Cenococcum geophilum or Lactarius rufus showed no dependence on specific element contents in the roots, whereas distribution of Russula ochrokuca correlates with different parameters. Naturally, ectomycorrhizal coenosis are evolved with poor nutrient conditions. Corresponding to this, most of the observed ectomycorrhizal morphotypes, except the euryoecious species, reached an over proportional abundance on root tips of a low P and N content. This was especially pronounced by Russula ochrokuca mycorrhizae showing a distinct preference being established with root tips of low N, S, C, or P contents.