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new cultivar of Japanese Cedar is described and illustrated. It originated from seeds received in 1961 from Gadow Arboretum (E Germany) and was propagated by cuttings in 1978 and 1985. The maternal tree in Rogów was killed by frosts during severe winter of 1986/87. The newly described form differs from the type in having very short needles.
The list of 46 self-sowing alien woody plant taxa in Rogów Arboretum is presented, which is an expantion of the list from 1992 when the first article on spontaneous regeneration of alien tree and shrub taxa in the Arboretum was published. Most of species described are rather infrequently found in Polish collections and are known to produce self-seedlings not capable of sexual reproduction, however Abies grandis can be included into group of plants that could produce seedlings capable of sexual reproduction.
The Balkan pine (Pinus peuce) is a Balkan Peninsula endemic tree species, growing in high mountains of Bulgaria, Macedonia, Serbia, Montenegro, Kosovo, Albania, and Greece and forming pure and mixed stands in subalpine forests. The paper gives a survey of biodiversity of Balkan pine stands in the Rogów Arboretum in reference to environmental data. In the plots examined, 29 taxa of vascular plants, 29 taxa of macrofungi and 127 taxa of invertebrates were recorded. The revealed diversity is discussed with regard to the data from Pinus peuce natural habitats.
The study was carried out in 39- and 43-year-old stands of noble fir (Abies procera Rehder) grown in the Rogów Arboretum of the Warsaw University of Life Sciences (Poland). The main objectives of our study were (1) to estimate stem volume over bark of noble fir grown out of its natural range, (2) to develop suitable allometric equations for estimating aboveground woody biomass components and (3) to estimate aboveground woody biomass components using site-specific allometric equations and to compare them with biomass estimated using allometric equations developed in stands grown within natural range of noble fir. The study showed that the mean DBH of trees was 20.14 cm in the younger stand and 22.25 cm in the older stand. The basal area of the 39-year-old stand was 49.01 m2·ha-1 and 43-year-old stand was 47.53 m2·ha-1. Based on the developed equation stem volume over bark was 374.87 m3·ha-1 and 356.24 m3·ha-1 in the 39- and 43-year-old stands, respectively. Based on the developed site-specific allometric equations total aboveground woody biomass in the 39-year-old stand was 189 Mg·ha-1 whereas in the 43-year-old stand it was 184 Mg·ha-1. Branch biomass in both stands equaled 19.9% of total aboveground wood biomass. Total aboveground woody biomass, estimated by allometric equations published by Ter-Mikaelian and Korzukhin [1997], equaled 233 Mg·ha-1 and 228 Mg·ha-1 in the 39- and 43-year-old stands, respectively. This means that the aboveground woody biomass is overestimated by ca. 23% in comparison with biomass estimated by our site-specific allometric equation. Generally, the existing equations published by Ter-Mikaelian and Korzukhin [1997] overestimated total aboveground woody biomass and stem biomass, while branch biomass was underestimated across all tree sizes compared to directly obtained biomass data.
The paper gives a survey of biodiversity of planted grand fir (Abies grandis) stands in Rogów Arboretum on the background of environmental data compared to those of its natural distribution. Some information concerns studies on grand fir plantations in Europe and their influence on chosen components of the ecosystem. During the study, 63 taxa of vascular plants, mosses and liverworts, 46 taxa of fungi and 110 of invertebrates were found.
The paper gives a survey of biodiversity of noble fir (Abies procera) stands in Rogów Arboretum on the background of environmental data. Noble fir is native to the mountains of north-western United States. During the study in the Rogów Arboretum we have found 53 taxa of vascular plants and mosses, 51 taxa of macrofungi and 112 of invertebrates in Abies procera stands. The documented biodiversity of planted Abies procera stands has been commented with respective data from natural habitats.
The paper gives a survey of biodiversity of Greek fir (Abies cephalonica) stands in Rogów Arboretum on the background of environmental data. Greek fir is native to the southern and central Greece to the areas of the Mediterranean-montane climate. The data concerning differentiation and species composition of natural stands are not complete as well as those on Greek fir plantations in Europe. The study conducted in Rogów Arboretum has shown the presence of 62 taxa of vascular plants and mosses, 58 taxa of macrofungi and 132 of invertebrates.
Określono zmienność chemiczną 8 gatunków z rodzaju Eleutherococcus, pochodzących z Arboretum SGGW w Rogowie. W korzeniach, owocach i liściach oznaczono zawartość eleuterozydów, flawonoidów oraz kwasów polifenolowych przy użyciu HPLC. Stwierdzono wyraźne różnice dotyczące zawartości ww. związków zarówno w badanych gatunkach, jak i surowcach. Najbogatszym źródłem eleuterozydów okazały się korzenie E. leucorrhizus. W owocach było ich znacznie mniej. W liściach nie stwierdzono obecności eleuterozydów. Okazały się one natomiast bogatym źródłem flawonoidów i kwasów polifenolowych.
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