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Szczecin harbours Poland’s largest London plane tree population. The London plane trees growing in Szczecin’s Żeromski Park were subjected to dendroclimatological research (analyses of signature years and response function). The study was based on a composite site chronology, signed ZER, spanning 105 years (1900–2004); the mean annual tree ring growth was 2.59 mm. Precipitation, particularly that in late winter- early spring and in the summer months was found to be a factor decisive for the tree’s cambial activity. A high sum of precipitation during the periods mentioned induced positive growth responses in the trees. Thermal conditions during the growth period proved to be another factor controlling the annual tree ring growth, as shown by linear relationships. The tree ring growth-climate relationships in the population under study as well as the between-parks differences in the London plane tree response can be explained by differences in habitat conditions. The trees under study grow in the vicinity of a busy, frequently repaired street and are surrounded by pavement and/or hardened road surface, which greatly limits the infiltration of moisture supplied by precipitation.
The leaf blades of white ash Fraxinus americana L. and London plane tree Platanus acerifolia Willd. growing in heavy polluted industrial areas were studied for morphological and anatomical changes developed under the influence of industrial contamination. The aim of the investigation was to determine and compare the influences of air polluted with SO2, NxOx, Pb, As, Zn, Cu etc. on the morphology and the structure of the leaves of these deciduous trees. Both species are tolerant to environmental changes but with different environmental characteristics and tolerances and they are widely used for planting. Under polluted conditions, the trees strengthened the anatomic xeromorphic characteristics of their leaf structures, which gave them the opportunity to mitigate the stressful conditions of the environment. The observed responses are regarded as adaptive and compensative to the adverse effects of air pollution.
W pracy przedstawiono ocenę wpływu warunków miejskich na wzrost i kondycję platana klonolistnego Platanus xhispanica ‘Acerifolia’. Badania prowadzono na wybranych stanowiskach w Szczecinie. Oceniano żywotność, wybarwienie liści oraz przyrosty szerokości słoi rocznych. Stwierdzono występowanie silnej korelacji pomiędzy stanowiskiem uprawy a stanem fizjologicznym i przyrostami grubości pni drzew.
The article presents the fluctuation in Phyllonorycter platani population on plane trees in the urban area of Szczecin in 2005–2007. The species is well known in Europe for over 100 years. The first appearance of the pest was recorded in Poland in 1969. In the surrounding area of Szczecin P. platani was recorded in 1994. The result of presented studies revealed a decrease of the population of P. platani during the whole period of observation. In each year there was a slight increase in the number of insects, because of the developement of several pest generations yearly.
The subject of performed research was the assessment of healthfulness of plane trees (Platanus L.). Observations were carried out on the areas of historic parks in Rzeszow province in 2008–2009. The obtained results revealed a growing threat of anthracnose and as a consequence a growing intensity of the disease symptoms occurred on leaves. A higher intensity of anthracnose occurrence was recorded in the summer and autumn months, especially of on planes trees growing in the alleys of the Łańcut Park. The effect of biopreparations: Biosept 33 SL at concentrations of 0.05%, 0.1%, 0.2% and Biochikol 020 PC at 0.5%, 1% and 2% on the growth of mycelium of Apiognomonia veneta was assessed by the in vitro method. The preparation Bravo 500 SC at 0.2% was used as a standard. The studied preparations: Biosept 33 SL and Bravo 500 SC, showed a strong inhibiting effect on the growth of the pathogen mycelium, whereas Biochikol 020 PC at 2% had weak effect iveness. Biochikol 020 PC at 0.5% and 1%, added to the nutrient medium did not affect the mycelium growth.
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