Biologische Sanierung von Carbochemie-Altlasten. Teilverbund 1: Kontrollierte Humifizierung von polyzyklischen aromatischen Kohlenwasserstoffen. Teilverbund 1/5: Abbau von polyzyklischen aromatischen Kohlenwasserstoffen durch Mykorrhizapilze Abschlussbericht

A recycling soil with inserted PAH in the humus complex is to be spread on recultivation grounds meant for reforestation. In this context, the project investigated the role of the ectomycorrhiza in the release and degradation of PAH and the influence of PAH on the development of plants and mycorrhizas. PAH contents of 635 mg / kg at the start of a greenhouse experiment with oaks and actually contaminated soil inhibited plant development in a minor degree. A wild form of mycorrhiza was able to establish during the 8 months lasting experiment. The degradation potential of soil was sufficient for low molecular PAH, first with rising molecular weight of PAH the impact of mycorrhizal oaks for degradation increased. Liquid culture experiments with mycorrhizal fungi and pyrene and "1"4C-phenanthrene as PAH model substances have shown that the fungi considerably vary in their PAH degradation capacity, depending on the enzyme equipment. The PAH degradation potential of the genus Lactarius is bigger than that from other mycorrhizal fungi. A considerable metabolism of the model substances is caused by Lactarius rufus. Its capacibility to mineralise phenanthrene could be proofed by measurement of "1"4CO_2 release. The planting of trees infected by appropriate mycorrhizal fungi offers a remedial technique for large contaminated areas with low PAH contents or continuous PAH immission. (orig.)SIGLEAvailable from TIB Hannover: F98B1349+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman