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    Wyświetlanie 1-6 z 6
    Tytuł:
    Odnawianie niezadarnionych powierzchni skalistych w Sudetach Srodkowych sadzonkami swierka z balotu Nisuli bez przygotowania gleby
    Autorzy:
    Kmiecik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/817825.pdf
    Data publikacji:
    1992
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    zalesianie
    Sudety Srodkowe
    odnowienia lasu
    swierk
    lesnictwo
    powierzchnie skaliste
    Źródło:
    Sylwan; 1992, 136, 02; 67-71
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sposoby określania miąższości kłód brzozy brodawkowatej (Betula pendula Roth)
    Methods for determining the volume of silver birch (Betula pendula Roth) logs
    Autorzy:
    Bruchwald, A.
    Dmyterko, E.
    Witkowska, J.
    Jodłowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/986659.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    brzoza brodawkowata
    Betula pendula
    klody odziomkowe
    klody srodkowe
    miazszosc klod
    metody obliczen
    log volume
    two−sectional equations
    middle cross section equations
    empirical equations
    Opis:
    The purpose of the research was to develop and evaluate the accuracy of various methods for determining the volume of the butt−end (from 0 to 6 m) and middle (from 6 to 12 m) logs of silver birch. The material was collected on 84 samples plots established throughout Poland. On each plot, 2 to 10 trees (722 in total) were felled and measured using a cross−section method. The average age of the measured trees ranged from 22 to 97 years, the average diameter at the breast height from 7.0 to 39.6 cm, and the average height from 8.1 to 31.2 m. We tested 4 methods for log volume determination. Two can be used for individual logs and two for stacks. In method 1 one measures the log length and diameter under bark at a distance of 1 meter from the butt−end and at half the length of the remaining part of the log. The log volume is defined by a two−sectional formula based on the middle cross−section (eq. 1). The average error for that method is close to zero, regardless the log length (tab.). In method 2, two−sectional formula of the middle cross−section was used with the diameter in the middle of each section calculated from the developed regression models based on the log length and diameter under bark at the top end. For both logs the error of volume calculation is small, especially for the middle one (tab.). Method 3 defines the log volume using the middle cross−section formula, which requires log length and diameter at half of the length. For the butt−end log, the volume has a systematic negative error, exceeding –5%. For the middle log, the formula is characterized by high accuracy. Method 4 is also based on the middle cross−section formula, but the diameter up to half the length is calculated from empirical formulas based on the log length and diameter under bark at the top end (eq. 5c and 6c). The accuracy of this method is close to the accuracy of method 3 (tab.). To determine the log volume in inaccessible places, method 2 can be recommended. The corresponding diameter is calculated from the regression equations. This method can also be used when the measurement places are accessible, which unifies the birch log measurement methods. However, determination of birch logs volume based on the commonly used middle cross−section formula should not be applied as for the butt−end log this method produces too large negative error, additionally increased by the rounding down the diameter measurement.
    Źródło:
    Sylwan; 2018, 162, 06; 443-451
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany składu chemicznego wód w strumieniach śródleśnej niszy źródliskowej w dolinie Kamiennej (Pomorze Środkowe)
    Changes of water chemistry in mid-forest headwater streams in the valley of the Kamienna (Middle Pomerania)
    Autorzy:
    Parzych, A.
    Jonczak, J.
    Sobisz, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/989491.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Pomorze Srodkowe
    dolina Kamiennej
    nisze zrodliskowe
    strumienie lesne
    wody plynace
    wlasciwosci fizykochemiczne
    sklad chemiczny
    zmiany skladu chemicznego
    headwater areas
    springs
    water chemistry
    riparian forest
    Opis:
    The paper concerns changes of chemical composition of water in headwater streams in the valley of the Kamienna, left bank tributary of the Słupia River (54°19′N; 17°10′E). Water samples were collected in 2012 from three streams, in their upper, middle and lower course every month. Analysis included water temperature, pH, conductivity, and the content of dissolved oxygen, HCO3– , K+, Na+, Ca2+, Mg2+, NH4+, Cl–, NO3–, PO43– and SO42–. Water of the analysed streams was characterized by generally low concentration of solutes (tab. 1) and had bicarbonate−calcium character. The observed low variability of water temperature along the streams resulted from their shortness and rapid flow. Low variability was also observed in case of pH and Mg2+ content. Increasing trends downward the streams were noticed for dissolved oxygen, while decreasing changes were observed for HCO3–, NO3– and PO43–. The remaining components showed different trends in the individual streams, indicating importance of local−scale factors.
    Źródło:
    Sylwan; 2016, 160, 10; 871-880
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Właściwości materii organicznej gleb śródleśnych nisz źródliskowych w dolinie Kamiennej (Pomorze Środkowe)
    Properties of soil organic matter in soils of mid-forest spring niches in the Kamienna Creek valley (Middle Pomerania)
    Autorzy:
    Jonczak, J.
    Parzych, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/989393.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Pomorze Srodkowe
    dolina Kamiennej
    nisze zrodliskowe
    gleby lesne
    materia organiczna
    stopien rozkladu masy torfowej
    odczyn gleby
    zawartosc wegla organicznego
    zawartosc azotu ogolnego
    sklad frakcyjny
    absorbancja promieniowania
    headwater areas
    histosols
    soil organic matter
    Opis:
    The paper presents the result of the studies on the properties of soil organic matter in Sapric Histosols associated with mid−forest spring niches in the valley of the Kamienna Creek, left bank tributary of the Słupia River (northern Poland). We sampled five soil profiles at the depth of every 10 cm until the mineral bed was reached. We analyzed degree of peat mass decomposition, reaction and the content of organic matter, total organic carbon and total nitrogen. Fractional composition of soil organic matter was analyzed with Schnitzer method. We measured the absorbance at wavelenghts of 280, 465 and 665 nm in 0.01% alkaline solutions of humic acids and the absorbance ratios A2/6, A2/4 and A4/6 were calculated based on these data. The studied soils consisted of strongly and moderately decomposed alder and alder−sedge peat, which contained 309.7−829.0 g/kg of organic matter. The soils were moderately abundant in nitrogen and were characterized by low variability in pH (pHH2O 5.6−6.9). Soil organic matter was dominated by humins, contribution of which ranged from 71.5 to 91.9%. Humic acids constituted 4.9−22.1%, fulvic acids 1.9−6.7% and the most labile organic substances extracted during decalcification of samples (Cdek) – 0.2−1.1% (tab. 2). The observed relatively low degree of humification and quantitative predominance of humic acids over fulvic acids are features typical for riparian organic soils. High values of absorbance ratios of alkaline solutions of humic acids (tab. 3) indicate predominance of aliphatic structures over aromatic in their molecules, which is typical for weakly humified organic substances.
    Źródło:
    Sylwan; 2016, 160, 02; 135-143
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pierśnica i wysokość drzew a ugałęzienie i proces oczyszczania się strzał na przykładzie modrzewia europejskiego (Larix decidua Mill.) z Sudetów Środkowych
    Breast height diameter and tree height in relation to branching and self-pruning of steams based on European larch [Larix decidua Mill.] from the Central Sudety Mountains
    Autorzy:
    Szymański, M.
    Pazdrowski, W.
    Kaźmierczak, K.
    Zasowski, P.
    Nawrot, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1013269.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    Sudety Srodkowe
    ugalezienie
    wysokosc drzew
    Larix decidua
    lasy gorskie
    samooczyszczanie
    lesnictwo
    piersnice drzew
    modrzew europejski
    drzewa lesne
    european larch (larix decidua mill.)
    the sudety mountains
    self−pruning
    timber
    wood defects
    Opis:
    Knots are remnants of branches left on the stem or visible in the side of the tree. They affect wood quality and its final utilisation. The rate of self−pruning depends on many factors, including tree species. The balance of assimilation and disassimilation to a considerable degree determines natural clearance of branches. The aim of the study was to determine the dynamics of natural clearance of branches in European larch (Larix decidua Mill.) varying in breast height diameter and height. Analyses were conducted in stands of different age classes. After mean sample trees were felled (selected according to Urich I) macroscopic observations were conducted, classifying individual zones of the stem into separate classes according to the rate of self−pruning. Analysed traits were found to vary considerably. A strong relationship was shown between breast height diameter, tree height and the length of the knot−free zone. The crown of the analysed forest−forming species retains similar relative length throughout the life of a tree.
    Źródło:
    Sylwan; 2008, 152, 11; 47-55
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ oddziaływań brzegowych na roślinność polan leśnych w Sudetach Środkowych
    Influence of the edge effect on the vegetation of forest glades in the Middle Sudety Mts. (SW Poland)
    Autorzy:
    Pruchniewicz, D.
    Żołnierz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/989965.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    gory
    Sudety Srodkowe
    Gory Sowie
    Gory Bardzkie
    Wzgorza Wlodzickie
    Wzgorza Wyrebinskie
    polany srodlesne
    oddzialywania brzegowe
    roslinnosc lakowa
    sklad gatunkowy
    roznorodnosc gatunkowa
    forest glades
    edge effect
    species composition
    functional groups
    species diversity
    Opis:
    The influence of the edge effect on the meadow vegetation pattern was studied in the forest glades in the central part of the Middle Sudety Mts. (SW Poland). The spectacular edge effect is seen in the range of 4 m from the forest border towards the center of the glades. Within that belt we observed decrease in tree and bush species number, increase in share of graminoids and Fabaceae species, as well as increase in share of species generally related to grassland communities. A significant increase in species number and values of Shannon−Wiener diversity index was noticed within the distance of eight meters from the edges of glades.
    Źródło:
    Sylwan; 2014, 158, 07; 524-530
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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