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    Wyświetlanie 1-4 z 4
    Tytuł:
    Zapis zmian zachodzących w środowisku przez sosnę zwyczajną oraz sosnę Banksa
    Record of the changes in environment by Scots pine and Jack pine trees
    Autorzy:
    Wilczyński, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/979308.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    basal area increment
    growth reduction
    pollution
    air temperature
    dendroclimatology
    Opis:
    The aim of the study was to investigate how industrial pollutants and change of thermal conditions of winter season in the second half of the 20th century affected the basal area increment (BAI) and the climatic signal in the BAI chronologies of Pinus sylvestris and Pinus banksiana. Samples were collected from 21 trees of both species growing in the Chrzanów Forest District (50°20' N, 19°47' E) which is located between the Upper Silesian and Krakow Industrial Regions. Two cores were taken from each tree. Tree−ring widths were measured at the cores and the BAI for each year in the period 1930−2016 was calculated. The growth reductions of both pine species in the years 1951−1970, increasing of diversity of growth reactions from year to year and also reduction of strength of climatic signal in the period 1963−1994 may have been caused by industry pollution. The reduction of wood growth, the increase of the diversity of short−term incremental reactions and also the reduction of strength of the climatic signal were greater in Jack pine. This indicates that Scots pine was more resistant to pollution. As an industrial production declined and environmentally friendly technologies were introduced in the 1990s homogeneity of growth reactions and strength of dependence between BAI and climate parameters in both species increased. A significant increase in the strength of the relationship between January temperature and BAI of Scots pine and Jack pine was observed in the early 2000s. This may suggest that the vegetation season starts already in January in the study area.
    Źródło:
    Sylwan; 2020, 164, 07; 583-593
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Długotrwałe efekty różnego nasilenia trzebieży selekcyjnej w drzewostanie sosnowym
    Long-term effects of different thinning intensity in young Scots pine stands
    Autorzy:
    Zachara, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/986702.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    hodowla lasu
    drzewostany sosnowe
    zabiegi pielegnacyjne
    trzebiez selekcyjna
    sosna zwyczajna
    Pinus sylvestris
    wzrost roslin
    jakosc hodowlana
    scots pine
    silviculture
    tending cuts
    basal area increment
    stand resistance
    Opis:
    The paper describes a case study of thinning experiment established in 1976 with a use of random block design in 21−year−old Scots pine stand in Janów Lubelski Forest District (south−eastern Poland). The stand was subjected to no thinning (control variant K), weak thinning with removal of 10% of basal area (variant S1), strong thinning with removal of 30% of basal area (variant S3) and extreme thinning, where only future crop trees and some reserve trees were left (variant TE). S1 and S3 treatments were repeated each 5 years, while in TE treatment the 20−year interval was applied. During the period of 40 years all trees were measured each 5 years and current basal area increment was calculated for the whole stand and for future crop trees population. The relative increment of future crop trees population calculated as a percentage of stand total increment was taken into account too. Data were subjected to ANOVA and differences were compared with Tukey test. The results showed that total stand increment was not influenced by thinning intensity. The future crop trees increment was significantly higher in a case of extreme thinning in comparison to weak thinning and to the control treatment during the first 20 years of experiment (age 21−41). During the second 20 years (age 41−61) only relative basal area increment of future crop trees population was significantly higher on the plots with extreme thinning in comparison to other treatments. The results suggest that a weak thinning brings no silvicultural effect meant as increased growth of previously selected future crop Scots pines. Strong or very strong thinnings give a long−term growth effect and they can be acceptable, but in healthy and well−tended young pine stands only.
    Źródło:
    Sylwan; 2017, 161, 09; 730-737
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ konkurencji na przyrost grubości buka (Fagus sylvatica L.) i sosny (Pinus sylvestris L.) w dwupiętrowych drzewostanach bukowo-sosnowych
    Effect of competition on diameter growth of European beech (Fagus sylvatica L.) and Scots pine (Pinus sylvestris L.) in two-storeyed beech-pine stands
    Autorzy:
    Dudzińska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/991628.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany bukowo-sosnowe
    drzewa lesne
    konkurencja roslin
    buk zwyczajny
    Fagus sylvatica
    sosna zwyczajna
    Pinus sylvestris
    przyrost grubosci
    przyrost piersnicowego pola przekroju
    przyrosty radialne
    radial increment
    basal area increment
    competition indices
    mixed stands
    Opis:
    The studies were based on the empirical material collected from 88 sample plots located in 78 beech−pine stands and 10 pine stands with beech undergrowth. The effect of the competition of beech trees from the understorey and pine trees on the radial increment (Δr) and basal area increment (Δg) was investigated. The strength of the competition was determined using distance−independent indices, which did not take into account the position of a tree in the stand. The effect of the competition on the basal area growth of both beech and pine trees was found to be greater than on the radial growth.
    Źródło:
    Sylwan; 2013, 157, 10; 730-736
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zróżnicowanie bieżącego przyrostu sosen w trzech klasach wieku
    The current growth increment of pine tree stands comprising three different age classes
    Autorzy:
    Kaźmierczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1339817.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    dendrometria
    drzewa lesne
    klasy wieku
    klasy Krafta
    drzewostany I klasy wieku
    drzewostany II klasy wieku
    drzewostany III klasy wieku
    sosna zwyczajna
    Pinus sylvestris
    przyrost drzew
    przyrost biezacy
    przyrost wysokosci
    przyrost piersnicy
    przyrost piersnicowego pola przekroju
    przyrost miazszosci
    height increment
    dbh increment
    basal area increment
    volume increment
    growth space
    crown
    age
    biosocial position
    Opis:
    The study presents the results of an analysis of the pine tree growth increments (height increment, dbh increment, basal area increment and volume increment) for a 5-year period. The study involved Scots pine trees of Kraft's class 1, 2 and 3 (dominant stand) in stands of different age classes (II, III, V) growing in fresh mixed coniferous (BMoew) and fresh coniferous (Boew) forest habitats. The multivariate analysis of variance was performed to assess the statistical significance of age and dominance of trees within a stand on their increment. The dominance position was classified for each tree using Kraft's criteria. The following characteristics were also measured: dbh of the trunk in two directions (N-S and W-E), and crown projection area on the basis of the characteristic tree crown points, projected using of a crown projector, characteristic points in tree crowns (7 to 14 on average). The actual height was determined after trees were felled. The following measurements of the single tree growing space were selected and determined: crown projection area – pk (m2), crown diameter – dk (m), Seebach's growth space number – dk / d1. 3 , crown projection area to basal area ratio –d d k 2 1 3 / 2. , crown deflection coefficient –d h k / , single tree space ppd=pk·h (m3). We assessed the strength of the relationships between tree growth parameters and tree growth space, crown length, relative crown length and slenderness. Both the age and dominance position of trees within the stand affected the growth increments. The strongest correlation among measured traits was between the 5-year volume increment and decreasing slenderness.
    Źródło:
    Leśne Prace Badawcze; 2013, 74, 2; 93-100
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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