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    Wyświetlanie 1-6 z 6
    Tytuł:
    Effect of polluted environment on the female and male strobili bearing of European Scots pine provenances
    Autorzy:
    Chalupka, W.
    Rozkowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/41518.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Scotch pine
    pollen
    male flower
    polluted environment
    provenance
    Pinus sylvestris
    male
    female cone
    female
    Opis:
    Studies on female and male strobili production as well as on pollen production and viability were performed at a polluted (Luboń) and a control (Kórnik) sites. Female strobili bearing per tree and total length of male strobili produced per tree were significantly higher in Luboń than in Kórnik and the stand density and tree crown exposition to sunlight were likely responsible for that result. Percentage of pollen germination was not affected by any variables studied. Neither provenance nor provenance x site interactions were found.
    Źródło:
    Dendrobiology; 2000, 45
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tree-like pines on the Mshana peat bog in the Gorgany Mountains: a trace of Pinus uliginosa migration in the east Carpathians?
    Autorzy:
    Boratynska, K
    Sulikowska, A.
    Iakushenko, D.M.
    Jasinska, A.K.
    Sobierajska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/57562.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    pine
    Mshana peat bog
    Gorgany Mountains
    Ukraine
    Pinus uliginosa
    Pinus mugo
    Pinus uncinata
    Pinus sylvestris
    needle
    cone
    morphology
    variability
    taxonomy
    migration
    Carpathians Mountains
    Opis:
    The taxonomic position of the population of tree-like, mostly polycormic individuals of pines from the Mshana peat bog in the Gorgany Mountains (East Carpathians, Ukraine) has been studied on the basis of the morphological characteristics of cones and needles, and anatomical characteristics of the needles. These features have been compared with the surrounding Pinus mugo population as well as P. uliginosa, P. mugo, P. sylvestris and P. uncinata from natural populations of the taxa. Tree-like individuals were found to have the most similar needles to P. uliginosa, but most similar cone characteristics to P. mugo. It was concluded, that the tree-like population has a relic character and can present the trace of the early migration of P. uliginosa from the West and its hybridisation with P. mugo.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2010, 79, 2; 129-137
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany wilgotności i temperatury wewnątrz szyszek sosny zwyczajnej (Pinus sylvestris L.) łuszczonych dwuetapowo
    Changes in humidity and temperature inside the pine cones (Pinus sylvestris L.) in two stages seed extraction
    Autorzy:
    Aniszewska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1318565.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    drzewa lesne
    sosna zwyczajna
    Pinus sylvestris
    szyszki sosny
    wyluszczanie dwuetapowe
    wilgotnosc szyszek
    temperatura szyszek
    zmiany wilgotnosci
    zmiany temperatury
    seed extraction
    scale
    pine cone
    thermocouple
    Opis:
    Temperature measurements were taken: (1) under opening scales, (2) at the seed, and (3) in the stem, of pine cones. Changes in temperature were only examined during the second stage of a two-stage seed extraction process. During this phase a permanent dehydration temperature of 50°C was used, following comparison over a ranges of temperatures, between a lower limit of 35°C and a higher limited of 50°C. The temperature was slowest to increase in the cone's stem, and fastest to increase under opening scales. The temperature at the seed remained constant at around 43°C for the first hour of dehydration, before increasing to 50°C. The two-stages method of cone extraction employed here, with a permanent dehydration temperature of 50°C in second stage, can be used in extraction cabinets equipped with seed extractors that allow the continuous control of air humidity. The time spent soaking during the inter-stage break should last 5 minutes. Viability of seeds obtained in two-stages process was 78% to 89%.
    Źródło:
    Leśne Prace Badawcze; 2013, 74, 3; 205-214
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efektywność łuszczenia szyszek sosny zwyczajnej w warunkach produkcyjnych
    Effectiveness of Scots pine seed extraction at industrial scale
    Autorzy:
    Aniszewska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1015782.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    szyszki
    luski otwarte
    lesnictwo
    luszczenie
    lasy gospodarcze
    Pinus sylvestris
    liczebnosc
    efektywnosc
    nasiona
    sosna zwyczajna
    zywotnosc nasion
    czas otwarcia szyszek
    drzewa lesne
    cone
    scots pine
    extraction process
    Opis:
    In the paper the author compares the results of laboratory tests of the extraction process of whole cones and of those after processing (shortened) with the tests made in the production−scale seed extraction plant in Czarna Białostocka. The author suggests elevating extraction temperature and shortening the time of keeping cones in extraction chambers. She puts into doubts the rightfulness of cone shortening, as the quantity of seeds obtained from them is lower than the quantity obtained from the whole cones.
    Źródło:
    Sylwan; 2007, 151, 09; 22-28
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Porównanie ciepła spalania i wartości opałowej szyszek wybranych gatunków drzew leśnych
    Comparison of heat of combustion and calorific value of the cones and wood of selected forest tree species
    Autorzy:
    Aniszewska, M.
    Gendek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1312894.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    biomasa
    szyszki
    cieplo spalania
    wartosc opalowa
    drzewa lesne
    sosna zwyczajna
    Pinus sylvestris
    swierk pospolity
    Picea abies
    modrzew europejski
    Larix decidua
    jodla pospolita
    Abies alba
    cone
    wood
    biomass
    heat of combustion
    calorific value
    Opis:
    Every year, scaling plants buy (up to tens of tons) cones which needs to be peeled. After the process of scaling, the cones themselves are waste, which is partly sold. The problem of waste disposal is especially severe in plants where the processing is performed by electrically-powered scaling cabinets, but the problem does not apply to facilities where pellets are burned to produce heat. We examined the heat of combustion and calorific value of the residues from scaling plants that can be used in the production of refined wood fuels. The residues consist of the empty cones of pine, spruce, larch as well as husks and stems of silver fir. Additionally, we conducted measurements of the heat of combustion for wood and cones of each species and compared them to their respective calorific values The results revealed that the average calorific value of the cones is in the range 17.81–19.86 MJ/kg. Our work showed that empty cones have a significantly higher calorific value and heat of combustion than the wood of spruce, larch and fir. In the case of pine, cones and wood did not differ significantly. These results led us to the conclusions that empty de-scaled cones can be utilized as a valuable primary solid fuel or fuel additive for the production of refined products for the local market. Due to the low annual production of cones in comparison to other materials such as sawdust and wood chips, pine cones should be used as a supplement, to enrich fuels of inferior quality by enhancing their energetic properties.
    Źródło:
    Leśne Prace Badawcze; 2014, 75, 3; 231-236
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ jemioły (Viscum album) na jakość nasion sosny zwyczajnej (Pinus sylvestris)
    Influence of mistletoe (Viscum album) on the quality of Scots pine (Pinus sylvestris) seeds
    Autorzy:
    Jasiczek, N.
    Giertych, M.J.
    Suszka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/987164.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Nadlesnictwo Bolewice
    drzewostany nasienne
    drzewa lesne
    sosna zwyczajna
    Pinus sylvestris
    nasiona
    jakosc nasion
    kielkowanie nasion
    wielkosc szyszek
    produkcja nasion
    czynniki biotyczne
    polpasozyty
    jemiola
    Viscum album
    seed quality
    germination
    seed production
    semiparasite
    cone size
    Opis:
    Mistletoe is semiparasite adversely affecting the functioning of their hosts especially at water management level. So far, there have been no reports about the impact of mistletoe on seeds from any host. The aim of the work was to evaluate the effect of the presence of mistletoe on the quality of the seeds of Scots pine (Pinus sylvestris). Unopened cones from infected and uninfected trees were collected in April 2015 in the Excluded Seed Stand in Bolewice Forest District (52°2354.347N; 16°0501.978E). Measurements of cones and seeds were made. Some seeds were used for pot experiment, where the seedlings were planted from May to October 2015. On the second part of the seeds in the end of July and August germination tests were made. The size and mass of the cones, the number and weight of seeds, and the height and weight of the seedlings were lower for the material collected from the mistletoe trees. The differences were not large but statistically significant (tabs. 1 and 2). The results showed that mistletoe has a negative impact on the parameters of cones, seedlings and seeds quality.
    Źródło:
    Sylwan; 2017, 161, 07; 558-564
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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