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Fungi play an important role, as by decomposing dead organic matter they contribute to the carbon cycle in nature. Apart from this beneficial effect, fungi in forest ecosystems cause diseases of deciduous trees. Stumps, being remnants of stems left after felled trees, provide nutrient resources for various organisms, including fungi causing the most dangerous diseases of forest trees such as Armillaria root rot or Heterobasidion root rot. Colonisation of stumps is determined by three major factors, i.e. microhabitat, availability of nutrients and occurrence of other competing organisms. The primary aim of this study was to prepare an inventory of fruiting bodies of fungal species found on stumps in selected subcompartments of the Zielonka Experimental Forest Division, to present fungal species diversity in the analysed area and to identify factors determining the occurrence of fungi in the investigated area as well as those determining the intensity of stump colonisation by fungi. Results indicate that fruiting bodies were found less frequently on pine stumps than on stumps of deciduous species. The most abundant fungal species in terms of population size observed on stems in the analysed areas were Trametes versicolor (191 localities), Schizophyllum commune (136 localities) and Stereum hirsutum (130 localities). A vast majority of species reported in the analysed areas have a positive effect on the forest ecosystem.
The article presents the results of inoculation of beech and oak stumps with a biological preparation of oyster fungus (Pleurotus ostreatus) mycelium. The inoculum was grown on a sawdust substrate at Warsaw University of Life Sciences Department of Mycology and Forest Phytopathology. The experiment was set up at the Forest Experimental Station in Rogów. Stumps were inoculated: i) immediately after tree felling or ii) at approximately 5 and 12 months after felling. A total of 60 beech stumps and 50 oak stumps were inoculated in the years 2002– 2004. The infected stumps were then inspected for the presence of the mycelium and fruiting bodies of P. ostreatus. The presence of fruiting bodies of other wood-decaying fungi was also noted. The extent of rotting was determined macroscopically, with the causal agent being confirmed on the basis of isolation and identification of mycelium from fragments of colonized wood obtained from rooted-out stumps. Oyster fungus mycelium was found to colonise beech stumps much more effectively than oak stumps. Stumps inoculated immediately after, or five months after felling were more effectively colonized by the mycelium than those inoculated after one year.
One of the methods limiting the damages done by Armillaria species is to decrease the number of dead wood stumps attacked by it, particularly it refers to deciduous tree stumps.The objective of the presented paper was an attempt to estimate the possibility to select some saprotrophic fungi species whose ability of decaying oak wood is higher and faster than that of Armillaria ostoyae (Romagn.) Herink and Armillaria gallica Marxm & Romagn, and which could be utilized in a biological protection method preventing Armillaria root-wood attack. All analyzed wood samples were colonized by tested mycelia. Among the fungi which could be utilized in a biological method of protection against root mould caused by Armillaria, the fungus Tramestes versicolor has shown to be the best suited for this purpose. Four different isolates were tested, which have confirmed their efficiency in decaying oak heartwood. Therefore, this fungus could be used for the elaboration of a biopreparation protecting effectively against Armillaria root rot.
Magnolia cylindrica Wils. is one of the third most-protected wild plants in China. To describe the size structure and dynamics of its population, field data were obtained from eight newly established sites, using a contiguous grid quadrate method in Jiulong Mountain of East China. The population size structure and spatial distribution pattern were discussed based on a theoretical distribution model and assembling intensity index. The population size structure showed a declining trend because of the lack of seedlings. The number of stump-sprouting, size class III (sapling trees) individuals was large enough to make up for the shortage of small seedlings and the complete regeneration of populations through sprouting. The distributions of M. cylindrica, both seedling populations (Group A) and overall populations (Group B), were mostly clumped. The spatial pattern intensities of the populations at different stages (mainly small trees, middle trees, and big trees) were higher for Group A than those for Group B. The two groups have the same tendency in that the pattern intensity declined from small trees to the larger ones. Group A and Group B differed in spatial pattern: small and middle trees were randomly distributed in seedling populations, but aggregated in overall populations. The populations of M. cylindrica (both group A and B) were characterized by the pattern scale between 16 to 32 m2, measured by Greig-Smith and Kershaw methods. These results suggest that sprouting should be seriously considered in population rehabilitation and forest tending management and the area of forest tending management should be close to the maximum intensity.
The aim of this study was the analysis of H. annosum s. s. stand infection and also the stumps colonization by P. gigantea and H. annosum a year after stumps inoculation with biopreparation. The study was conducted in 40-year-old Scots pine stand growing on the post arable soil, where two plots had been established. After commercial thinning the stumps treatment with P. gigantea was done. There were no sporocarps or mycelium of both H. annosum and P. gigantea on investigated stumps. The mycological analysis of wood showed that 64-72% stumps were colonized by P. gigantea and 14-17% by H. annosum. The mycelium of both fungi was also isolated from roots (34-42% colonized by H. annosum and 21-31% by P. gigantea). This study confirmed that stumps treatment in pine stands growing on the post arable soil plays the important role in avoiding the risk of Heterobasidion disease.
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