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The ability of spatial expansion and conquering of new locations, suitable for growth, is one of the most important properties enabling different plant species (including forest trees) a permanent existence in a constantly changing (in space and in time) environment. In the course of evolution, plants developed several adaptations and mechanisms enabling them to capture new localities appropriate...
Oak gall−nuts are pathological excrescences on the leaves of oaks (in Poland: Quercus robur L. and Q. petraea Liebl.) created by the Cynips quercusfolii L. The potential medical use of these non−wood forest products should be taken under consideration because of widespread use in folk medicine, but also because of the presence of gall−nuts of Middle Eastern oak species Quercus infectoria in the current...
The intermediate cuttings have an important impact on the stand structure and productivity. Choosing the right method of the treatment performance is the decision, which is fundamental in shaping tree stands stability. The radial increment, apart from the natural growth potential of particular species, is influenced by many abiotic, biotic and anthropogenic factors, among which one can distinguish...
Erysiphe alphitoides causes the most common disease of assimilation apparatus of oaks of different age. It is believed that the pathogen overwinters in buds of the host plant or in the cracks of the bark. The aim of the study was to search for the presence of E. alphitoides in buds, leaves, and wood of sessile oak shoots using molecular techniques. Two hypotheses have been tested: (i) oaks are infected...
Oak decline phenomenon has been observed in Poland in the 1980s. Especially, Krotoszyn Forest District was affected in the years 1982−1984, when oaks were dying in a mass extend causing economic and ecological problems. Twenty five years later many Phytophthora species were isolated from rhizosphere soil suggesting their important role in fine root damage. This research was focused on application...
Scots pine stands in central Poland are now seen to be experiencing dynamic development of lower layers formed by oaks. The under−canopy natural renewal taking place in this way is sometimes characterised by good silvicultural quality, and could therefore be taken advantage of in the process of stand conversion. The study assess the quality of existing undergrowth layers of oak present in older stands...
The objectives of the study was to investigate and compare the characteristics of oak advance−growth of various age present under Scots pine canopy and growing on the mesic mixed coniferous (BMśw) or mesic mixed deciduous (LMśw) forest site types. The study was conducted in Kolumna Forest District (central Poland) in 21 Scots pine stands ca. 90 years of age, and with a well−developed oak advance−growth...
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