Mykorrhiza, Holz- und Streuabbau : Pilze in ökologischen Schlüsselrollen bei der Wiederbewaldung nach Sturmwurf : Workshop Sturmwurfforschung

1999

S. 42-52

19 Lit. Ang.

Unselbständiges Werk

200058908

In the process of reforestation after catastrophic windthrow, fungi are involved in three ways: (1) Wood decomposers are responsible for the recycling of the huge amount of logs, (2) litter decomposers are activated by the changing habitat conditions and (3) the ectomycorrhizal fungi are essential as symbiotic partners of the growing young trees. Because some of the wood decomposers are also acting as forest trees parasites, there might be a risk of spreading these parasites into adjacent forest stands. In case of Stereum sanguinolentum and Nectria fuckeliana such a distribution into adjacent stands could not be found. In contrast, Heterobasidion annosum might be a threat for nearby conifers. During the first 5 years after the windthrow, the species composition of the litter decomposers changed significantly. The changes correspond with the shift of soil parameters during succession. seedling of Picea abies were studied concerning the chronology of their mycorrhization. It was found that mycorrhization started more than 3 months after germination. After half a year of growth 49% of the seedlings had obtained mycorrhization. The species diversity of the mycorrhizal fungi interacting with germlings was highest in intact forest stands and lowest on cleared windthrow areas.