The studies were carried out on two areas being party of complex meadows established on drained fens. The soil in both areas originated from tall sedge peats was classified to semi arid complex ВС. The soil of these areas differed in some thermal and hydrous properties. One area was three years old meadow while the second was partly overgrown by one- year meadow and partly by stable fifteen-year meadow. On meadow one-year and three-year patches without seedlings were observed. The soil samples were taken in autumn and spring from five sites: one-year meadow turfed places, one-year meadow non-turfed, three-year turfed, three year non-turfed and fifteen-year meadow turfed. Hydrous and thermal properties affected the number of nematode communities to a greater degree than the age of meadow itself. Phytoeuparasites and parasaprobionts visibly were more numerous on turfed places in comparison to non-turfed. In almost all autumn samples parasaprobionts dominated. Percentage participation of phytoeuparasites was higher in autumn than in spring. The studied communities differed in species composition, Morisita index of similarity calculated for pairs was low. The withering of seedlings was not related to the occurrence of parasitic nematodes. The growth of grass was not inhibited even at high number of parasitic nematodes Paratylenchus nanus and Tylechorhynchus dubius.
Analyses of 179 pine wood samples and 73 wood chips samples from sawmills showed presence of four species of Bursaphelenchus, B. mucronatus being the commonest (7.5 % of samples). The identification of species was done using microscopic as well as RAPD-PCR methods.
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