Diversity of Ectomycorrhizal Morphotypes and Oak Decline : Root - Soil Interactions in Trees

2000

S. 109-116

25 Lit.Ang.

Unselbständiges Werk

200083843

In two oak stands were compared to those of vigorous trees. Ectomycorrhizal roots were morphotyped and counted. Fortysix ectomycorrhizae could be differentiated. While all morphotypes occurred in Patzmannsdorf, only 38 morphotypes were found in Niederweiden. The presence of some morphotypes was highly correlated with the crown-status of the trees. In both stands, the Shannon index of diversity calculated for the ectomycorrhizal microcoenosis was higher for the ectomycorrhizal microcoenoses of vital and of declining trees. The possiblity of reducing the number of morphotypes selected for the construction of the discriminant function without significant loss of information about the tree status was tested. Possible implications of the correlation of morphotypes with the crown-status of oak trees are discussed.