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    Tytuł:
    Juvenile wood volume and its proportion to stem volume vs. selected biometric features of Scots pine [Pinus sylvestris L.] trees
    Autorzy:
    Pazdrowski, W
    Tomczak, A.
    Kupczyk, G.
    Jelonek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/57743.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    breast height diameter
    tree height
    Scotch pine
    total stem volume
    determination coefficient
    juvenile wood
    Pinus sylvestris
    tree
    wood
    forest site type
    Opis:
    The aim of the study was to determine whether there is a correlation between breast height diameter, tree height and stem total volume of Scots pines, on the one hand, and volume and proportion of juvenile wood, on the other. The investigations comprised pure pine stands of the IInd, IIIrd, IVth and Vth age classes developed in conditions of fresh mixed coniferous forest. A distinct curvilinear correlation was found between volume and proportion of juvenile wood in tree stems and breast height diameter, height and stem total volume. Because of high values of determination coefficients (R2), which characterised the above-mentioned correlations, it seems appropriate to use these regularities to assess the quality of the timber raw material regarding the proportions of its volume and juvenile wood in stems of Scots pine trees.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2005, 74, 4
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Population structure and regeneration status of most abundant medicinal woody plants in Mabira Central Forest Reserve management zones
    Autorzy:
    Tumuhe, C.L.
    Mwine, R.N.
    Manana, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049704.pdf
    Data publikacji:
    2018
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    woody plant
    medicinal plant
    population structure
    regeneration
    breast height diameter
    forest reserve
    Mabira Forest Reserve
    management zone
    dbh
    central forest reserve
    medicinal plants
    Opis:
    In the rural areas 90% of the Ugandans use plants for their medicinal uses. Communities around Mabira Central Forest Reserve (CFR) harvest plants for medicinal purposes. The increased uptake of herbal medicine is a threat to the abundance and health of medicinal trees. This research determined the species population structure and regeneration status of most abundant woody medicinal plant species in Mabira CFR. Sixty nested plots measuring 20×10 m were established adjacent to transects, 20 plots per management zone. The species sampled were identified, counted, and their diameter at breast height (dbh) taken. Their density was computed. Using the dbh classes and density data, dbh distributions were established. Using Kruskal- Wallis test we ascertained if significant differences existed in medicinal plant species densities for size classes in the 3 zones. Using linear regression we got relationship between plant density and dbh. A regression analysis of In (Ni+1) against di was made to cater for the zero values of abundance per hectare. The population had a steep negative slope, meaning that it is stable and naturally replacing itself. There was a general decline in species density with dbh. The <5 dbh size class had the biggest number of individuals per hectare in the production zone. The production zone had a high regeneration potential due to most individuals being in the smallest size class. Density had a negative linear relationship with dbh. There was a significant relationship between dbh and density of species. The tree species sampled were generally naturally regenerating.
    Źródło:
    Environment, Earth and Ecology; 2018, 2, 1; 6-11
    2543-9774
    2451-4225
    Pojawia się w:
    Environment, Earth and Ecology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Retrospektywna analiza wzrostu i przyrostu drzew w 30−letnim drzewostanie jodły kalifornijskiej (Abies concolor Eng.)
    Retrospective analysis of growth and increment of trees in 30−years−old stand of white fir (Abies concolor Eng.)
    Autorzy:
    Beker, C.
    Flieger, K.
    Turski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/994778.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany sosnowe
    sosna kalifornijska
    Abies concolor
    wzrost roslin
    dynamika wzrostu
    przyrost wysokosci
    przyrost piersnicowego pola przekroju
    przyrost miazszosci
    white fir
    growth
    height
    breast height diameter
    basal area
    volume
    Opis:
    The paper presents the results of the retrospective research on the height and diameter growth of trees in a 30−year−old white fir (Abies concolor Eng.) stand growing in the mixed broadleaved forest habitat in the Forest Experimental Station in Siemianice. The research concerned the volume and functionally related parameters including height, diameter at breast height and basal area.
    Źródło:
    Sylwan; 2012, 156, 12; 902-907
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Variability of Selected Features of the Morphological Structure of Scots Pine Introduced on a Reclaimed Waste Dump of a Former Sulfur Mine in Piaseczno
    Autorzy:
    Pająk, M.
    Wąsik, R.
    Michalec, K.
    Płoskoń, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/125306.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    forest reclamation
    post-mining areas
    diameter at breast height
    tree height
    crown length and width
    Opis:
    This paper presents the results of studies on the variability of selected features of the morphological structure of Scots pine trees, introduced on the post-mining lands in Piaseczno reclaimed for forestry. The field research was conducted in 2014 in the north-western part of a waste dump, on one-are circular sample plots. These plots were established in three groups, depending on the type of a substrate and the implemented reclamation treatments (1 – the Quaternary loose sands, 2 – mixed sediments of the Quaternary loose sands and the Tertiary Krakowiec clays, 3 – mixed sediments of the Quaternary loose sands and the Tertiary Krakowiec clays after an intensive preplant fertilization). The Scots pine trees introduced on the reclaimed dump displayed various crown structures and growth parameters. The longest and the widest crowns were recorded for the pine trees growing on mixed sediments of sands and clays, whereas the trees growing on loose sands had the smallest diameters at breast height.
    Źródło:
    Journal of Ecological Engineering; 2016, 17, 4; 83-90
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Półnaturalna przebudowa lipą drzewostanów sosnowych w Nadleśnictwie Doświadczalnym Siemianice
    Semi-natural transformation of pine stands with lime trees in the Siemianice Experimental Forest District
    Autorzy:
    Jaszczak, R.
    Magnuski, K.
    Stefaniak, I.
    Winkler, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1009712.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany sosnowe
    Tilia cordata
    wzrost roslin
    lipa drobnolistna
    przebudowa polnaturalna
    pozycja biosocjalna drzew
    przebudowa drzewostanow
    lesnictwo
    Nadlesnictwo Doswiadczalne Siemianice
    przyrost drzew
    drzewa lesne
    pine stand
    semi−natural transformation
    lime
    breast height diameter structure
    height structure
    biosocial
    structure
    Opis:
    The paper presents results of the inventories carried out in years 2000 and 2001 in a two−storeyed stands whose upper storey was made up of pine and the lower one – of lime. Lime breast height diameter and height as well as biosocial structures were discussed.
    Źródło:
    Sylwan; 2009, 153, 07; 442-450
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Struktura drzewostanów lipowo-sosnowych powstałych w wyniku półnaturalnej przebudowy starodrzewów sosnowych
    Structure of lime-pine stands established as a result of seminatural reconstruction of old pine forests
    Autorzy:
    Jaszczak, R.
    Małys, L.
    Turski, M.
    Hnat, M.
    Majowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1008329.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany sosnowe
    starodrzew
    przebudowa drzewostanow
    przebudowa polnaturalna
    drzewostany lipowo-sosnowe
    struktura drzewostanu
    drzewa lesne
    sosna zwyczajna
    Pinus sylvestris
    lipa drobnolistna
    Tilia cordata
    wzrost roslin
    pozycja biosocjalna drzew
    struktura piersnic
    struktura wysokosci
    old pine forest
    seminatural reconstruction
    pine
    lime
    structure of breast height diameter
    height structure
    biosocial structure
    Opis:
    The paper presents results of the inventory carried out in 2008 in two−storeyed stands in which the upper storey consisted of pine trees and the lower one of lime trees. The structure of breast height diameter, height and the biosocial structure of the two species was discussed.
    Źródło:
    Sylwan; 2012, 156, 05; 360-368
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena przydatności wybranych funkcji do modelowania rozkładu pierśnic w drzewostanach olszy czarnej (Alnus glutinosa (L.) Gaertn.)
    Evaluation of usefulness of selected functions for modeling distribution of breast height diameter in black alder stands (Alnus glutinosa (L.) Gaertn.)
    Autorzy:
    Orzeł, S.
    Pogoda, P.
    Ochał, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/988989.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany olszowe
    struktura grubosci
    olsza czarna
    Alnus glutinosa
    piersnice drzew
    rozklad piersnic
    rozklad teoretyczny
    aproksymacja
    modelowanie
    funkcja gestosci prawdopodobienstwa
    test Kolmogorowa-Smirnowa
    diameter at breast height
    diameter distribution
    probability density function
    kolmogorov−smirnov test
    Opis:
    We evaluated the usefulness of ten theoretical probability density functions for the approximation of the breast height diameter distributions in managed alder stands growing in the western part of the Sandomierz Basin (southern Poland). The study material consisted of measurement results for 22,530 alders obtained for 844 circular sample plots, established in 163 stands aged 6−89. In the area of particular stands, from 2 to 10 age−dependent circular sample plots sized 0.01−0.10 ha were systematically arranged. We evaluated the following theoretical probability distributions: normal (N), double normal (P−N), Johnson SB (J), Weibull (W), beta (B), Burr (Bu), gamma (G), log−normal (L−N), log−logistic (L−L) and Birnbaum−Saunders (B−S). Additionally the usefulness of the W, B, Bu, G, L−N, L−L and B−S distributions with omitted location parameter was tested. The goodness−of−fit of each probability density function was assessed based on the Kolmogorov−Smirnov statistic, the root mean square error and ranks established on their basis. It was found that DBH distribution of majority stands is characterized by right−sided asymmetry and negative kurtosis. It was showed that the best distribution for the breast height diameter structure approximation of alder stands is the Johnson SB (J) distribution. To describe the frequency of thickness, normal (N) and log−logistic (L−L) distribution should not be used. Elimination of location parameter significantly affects usefulness of probability density functions to modeling empirical distributions of breast height diameter. Gamma and Burr distributions with omitted location parameter gave the best results in description the frequency of breast height diameter. In certain situations, these distributions can also be used to describe the structure of breast height diameter of alder stands.
    Źródło:
    Sylwan; 2017, 161, 02; 101-113
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ efektu brzegowego drogi na cechy drzewostanów sosnowych Puszczy Noteckiej
    Edge-effect of the road on the Scots pine stands characteristics in the Notecka Forest
    Autorzy:
    Grajewski, S.M.
    Mizera, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/989417.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Puszcza Notecka
    drogi publiczne
    drogi o malym natezeniu ruchu
    oddzialywanie na srodowisko
    efekt brzegowy
    drzewostany sosnowe
    cechy taksacyjne
    zasobnosc drzewostanu
    miazszosc drzew
    road−edge effect
    diameter at breast height
    growing stock
    forest stand value
    very low−volume roads
    Opis:
    The development of the transportation network brings both benefits and threats. Much attention is paid to soil contamination with trace elements, difficulties in animal migration, noise propagation or synanthropisation of the vegetation cover. This paper deals with the effect of provincial road No. 150 on inventory characteristics of neighboring Scots pine stands in the Notecka Forest (western Poland) – one of the larger forest complexes in Europe. Twelve rectangular experimental sites were established perpendicular to the road axis, called belt transects. Each transect consisted of 3−4 plots located at different distances from the pavement edge (fig.). Measurements and estimations were recorded for the plots. Values from all belt transects were approximated within plots at the same distance from the road and then compared using statistical methods. Observations were conducted in Scots pine stands growing on fresh coniferous forest (Bśw) and fresh mixed coniferous forest (BMśw) sites. Reduced stand density that resulted in decreased basal area, volume and growth rates were observed in the immediate vicinity of the road compared to the forest interior. Individual trees were thicker, but more often burdened with defects decreasing timber value. Any considerable effect of the road on tree height wasn't observed. The above mentioned changes were more evident in poorer habitat conditions, while the location in relation to the road had no significant effect. Modified lighting conditions are probably the main cause of these changes. At the edge of Scots pine stands in the Notecka Forest, a unique ecotone has formed under the influence of the provincial road.
    Źródło:
    Sylwan; 2016, 160, 11; 915-922
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reakcja przyrostowa świerka w powiązaniu ze stopniem uszkodzenia korony
    Increment reaction of Norway spruce in connection with the crown damage level
    Autorzy:
    Bruchwald, A.
    Dmyterko, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1016122.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    korony drzew
    stopien uszkodzenia
    Picea abies
    lesnictwo
    piersnice drzew
    przyrosty roczne
    przyrost drzew
    swierk pospolity
    drzewa lesne
    increment of the diameter at the breast height
    increment reaction
    criteria of the assessment
    the damage to trees
    defoliation
    vitality
    tree−top condition
    norway spruce
    Opis:
    The study presents the analysis of the increment of tree diameter at the breast height in connection with two variants of the method of assessment the damage to Norway spruce stands. Variants utilise different assessment criteria. The first one is based on the tree's defoliation, the other one – on the damage index W that links defoliation, condition of the tree−top and branching in the middle part of the crown. Detected relations between damage criteria and type of the increment reaction show that index W characterises the damage to trees and stands better than feature A (defoliation). Therefore, method of assessment the damage to trees and stands based on this parameter is suggested for utilisation in the forestry practice.
    Źródło:
    Sylwan; 2007, 151, 11; 22-34
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Związki między wybranymi cechami drzewa a niektórymi właściwościami drewna młodocianego sosny zwyczajnej (Pinus sylvestris L.)
    Relationships between selected tree characteristics and the properties of juvenile wood in Scots pine (Pinus sylvestris L.)
    Autorzy:
    Tomczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1312952.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    drzewa lesne
    sosna zwyczajna
    Pinus sylvestris
    cechy morfologiczne
    wysokosc drzew
    piersnice drzew
    wysokosc osadzenia pierwszej zywej galezi
    srednica korony
    dlugosc korony
    drewno sosnowe
    drewno mlodociane
    gestosc drewna
    gestosc umowna
    wytrzymalosc na sciskanie wzdluz wlokien
    wytrzymalosc na zginanie statyczne
    modul elastycznosci przy zginaniu
    korelacja cech
    basic density
    strength perpendicular to grain
    bending strength
    modulus of elasticity
    breast height
    diameter
    tree height
    crown length
    crown diameter
    Opis:
    The aim of this study was to determine relationships between selected properties of juvenile wood and characteristics of the stem and crown of Scots pine. Analyses were conducted in northern Poland in eight mature pine monocultures. Nine trees were selected in each experimental site and their stems were divided into five sections. The centers of the sections were established at a height of 1.3 m from the tree base and at points corresponding to 20, 40, 60 and 80% tree height. Samples were taken from these locations, and these samples were prepared for analyses of basic density, compressive strength along the grain and static bending, as well as the modulus of elasticity during bending. The mean height of the investigated group of trees was 26.0 m with an average diameter breast high of 33.6 cm. The mean crown depth was 7.8 m and crown diameter was 3.6 m, and the mean basic density (Qu) of juvenile pine wood was 416 kg/m3. The average compressive strength along the grain (CS) was determined to be 22.3 MPa, while static bending strength (BS) was 45.8 MPa. The recorded modulus of elasticity (MOE) was 4726 MPa. Both in general terms and when dividing stems into sections, the wood properties correlated with tree characteristics to various degrees. All indexes were negative indicating that trees of greater dimensions produce juvenile wood of inferior quality. Properties of juvenile wood formed during various periods of tree life were mostly related to diameter breast high and crown depth. They were also correlated with tree height, but only to a limited extent. In contrast, properties of wood from the middle stem sections were significantly correlated with crown diameter.
    Źródło:
    Leśne Prace Badawcze; 2014, 75, 3; 237-244
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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