The paper focuses on changes in the weight and in the molecular structure of spruce chips submitted to long-term storing as well as to medium- and long-term model rotting degradation caused by some chosen fungi identified at storing processes on the pile. For the model decay of chips under laboratory conditions during 3 or 6 weeks the white-rot fungi: Phanerochaete chrysosporium, Heterobasidion annosum, Onnia circinata or Climacocystis borealis, and the brown-rot fungus Fomitopsis pinicola, have been used. Mass losses and changes in chemical composition of chips depended on the fungus used and time of decay. The highest weight losses were caused by the fungi H.annosum and F.pinicola, the most of cellulose was removed due to F.pinicola, the most of lignin due to H.annosum, at which the amounts of removed lipophilic extractives depended selectively on the fungus and time of degradation. The further aim of this work was to evaluate biodegradation processes in wood for the pulp production. Pulps prepared from the model rotted chips and also from the long-term stored chips had changed properties, obviously reduced Kappa number, content of rejects, tear length and tear index.

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