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摘要
The structure of spatial distribution and ecological properties mistletoe (Viscum album L. subsp. album P. W. Ball) were studied in the area in the vicinity of the town of Urz d車w, characterized for its general natural properties. In the region in question with the area of 59.6 km2, 69 single and group stations of this plant were reported in 2000-2007 (Fig. 1). They are concentrated mainly in highly built-up sites next to roads, less often at small distances from them. The mistletoe parasitizes here barely eleven host taxa (species and their varieties) representing trees only (Table 1). These are tree specimens, usually healthy, aged 40-60 years, mostly foreign to the Polish flora, seldom native ones. They grow basically as a result of plantings, usually in sites with sufficiently high insolation. They are found on soils of different types, from almost natural to typically anthropogenic ones, more often on dry or mesophilic, than on highly moistened. The main local mistletoe hosts include poplars of American origin (Populus xeuroamericana) in the varieties of %26apos;Marilandica%26apos;, %26apos;Robusta%26apos; and the native linden (Tilia cordata). Worth noting is the definite quantitative predominance of stations with scarce mistletoe specimens (e.g. Fig. 2, 6, 7) over the stations where this plant occurs in large numbers (e.g. Fig. 3, 4, 5). It should be also emphasized that in the area investigated the mistletoe exhibits great expansion in the stations that are both settled and new ones. However, mistletoe stations are being successively partly or completely mechanically destroyed in various ways. This mainly results from cutting its hosts or harvesting this plant for decorative and curative purposes. To date, similar features of the structure of spatial distribution of mistletoe stations and its ecological properties, dynamics and occurrence were reported in the vicinity of several towns in the central-eastern part of Poland.
