Autor: Velebil, J. - Katalog OPAC zbiorów

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Tytuł:: Five new bramble species (Rubus, Rosaceae) in the flora of the Czech Republic
Autorzy:: Velebil, J.
Travnicek, B.
Sochor, M.
Havlicek, P.
Powiązania:: https://bibliotekanauki.pl/articles/41123.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:: bramble
new species
plant species
Rubus
Rosaceae
flora
Czech Republic
geographic distribution
ecology
Opis:: This paper presents the results of extensive field research on the occurrence of Rubus L. species in the Czech Republic, especially in the frontier areas near the German border. In this area, Rubus adornatus, R. fasciculatiformis and R. perlongus were newly discovered. The other species, R. ambulans and R. stohrii, were discovered in the eastern and northern parts of Bohemia. A description, an illustration, photos and a list of localities are provided for each species. Taxonomy and nomenclature, ecology, distribution and etymology are discussed. The ploidy level of the mentioned species is presented here for the first time. All of these species are new for the flora of the Czech Republic.
Źródło:: Dendrobiology; 2016, 75
1641-1307
Pojawia się w:: Dendrobiology
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Wpływ technologii pozyskania i składu zrębków leśnych na ich wartość opałową i zawartość popiołu
Effect of harvest method and composition of wood chips on their caloric value and ash content
Autorzy:: Gendek, A.
Malatak, J.
Velebil, J.
Powiązania:: https://bibliotekanauki.pl/articles/986640.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Leśne
Tematy:: lesnictwo
biomasa lesna
zrebki drzewne
pozyskiwanie biomasy
skladowanie
wartosc opalowa
zawartosc popiolu
forest biomass
forest residues
composition of chips
share of ash
forest chips
Opis:: Wood chips composition and abundance of the impurities affecting the ash content are parameter of the chips quality that is important for the power plants. These parameters may be used as criteria in settlements between the supplier and the chipmaker. The determination of calorific value, ash content and share of individual elements in forest chips was undertaken. The wood chips obtained from the fragmentation of sawmill wastes and forest trees residues with various species compositions (Scots pine, multi−species and bundled Norway spruce residues) were investigated. The linear relationship between the ash content and the calorific value of the chips was determined. In all cases, the largest share (over 87%) in the composition of forest chips is assigned to the clean timber and wood particles with bark. The share of mineral impurities is within the range of 0.6−1.6%. The ash content in wood particles ranges 1.04−3.94% and is close to the values reported in the literature. In terms of ash content, the chips produced from bundled coniferous residues were the worst. The obtained results indicate that the best technology for obtaining high calorific value of dry wood chips (17.89−18.11 MJ/kg) with a low proportion of ash is the chipping of wood residues collected directly from the forest surface or from previously prepared piles. The least advantageous technology is the bundling of residues and their storage for several months (16.29 MJ/kg).
Źródło:: Sylwan; 2018, 162, 03; 248-257
0039-7660
Pojawia się w:: Sylwan
Dostawca treści:: Biblioteka Nauki

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