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    Wyświetlanie 1-7 z 7
    Tytuł:
    Stability Assessment and Composition of Tree Species in Nigerian University
    Autorzy:
    Chukwu, Onyekachi
    Chenge, Iveren B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1178080.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Tree stability
    slenderness coefficient
    species composition
    windthrow
    Opis:
    Wind remains a strong abiotic agent associated with damages of forest trees. The vulnerability of a tree to windthrow is highly influenced by the ratio of tree total height to its stem diameter (RHD). However, RHD has been identified as an index and measure of tree and stand stability. This study assessed the stability and composition of open grown tree species in the University of Ibadan, Nigeria. Diameter at breast height (Dbh) and total height (THt) of one hundred and thirty-nine (139) trees species with Dbh ≥5.0 cm found within three departments of the University were measured. A total of 36 species from 17 families were identified with Myrtaceae and Combretaceae families having highest (28.8% and 21.6%, respectively) numbers of tree. RHD was found to have negative correlation with all the tree growth variables investigated except THt. However, this study reveals that about 79 % of the trees found in the study area had RHD <80, indicating stable and low risk or susceptibility to windthrow, wind-induced bending and breakage. Hence, trees with RHD >80 (21%) were recommended for felling as they pose threat to human life and properties in the study area.
    Źródło:
    World Scientific News; 2018, 95; 235-245
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charakterystyka wybranych cech morfologicznych drzew w dojrzałych drzewostanach sosnowych eksponowanych na działanie wiatru
    Characteristics of selected morphological traits of trees in mature pine stands exposed to the action of wind
    Autorzy:
    Tomczak, A.
    Jelonek, T.
    Pazdrowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/990957.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany sosnowe
    wiatry
    drzewa lesne
    sosna zwyczajna
    Pinus sylvestris
    stabilnosc
    cechy morfologiczne
    piersnice drzew
    wysokosc drzew
    wysokosc osadzenia korony
    srednica korony
    dlugosc korony
    wind
    tree stability
    biometry
    scots pine
    Opis:
    The paper presents variability in morphological traits of trees in mature Scots pine stands exposed to wind. The analysed parameters included breast height diameter, tree height and length, diameter, lateral area and crown base area. Except for the crown base area and crown diameter, values of the other traits increased with an increase in the distance from the edge of the stand. Crown diameter in trees with average exposure to wind was smaller than diameters of trees growing on the edge of the stand (strong exposure) and within the stand (weak exposure).
    Źródło:
    Sylwan; 2014, 158, 03; 183-191
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Plasticity and stability of hybrid aspen clones in 14 field trials over Sweden, Finland and north-west Russia
    Autorzy:
    Fedorkov, Aleksey
    Stener, Lars-Göran
    Pulkkinen, Pertti
    Powiązania:
    https://bibliotekanauki.pl/articles/2041231.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    genotype × environment interaction
    plasticity
    Populus tremula
    Populus tremuloides
    stability
    survival
    tree height
    Opis:
    The study aimed at estimating the genotype × environment (G × E) interaction, stability and plasticity parameters for height growth and survival of hybrid aspen (Populus tremula L. × Populus tremuloides Michx.) clones. A set of 17 hybrid aspen clones were studied at age four in 11 field trials (series 1) and a set of 12 clones were studied at age 12 in three field trials (series 2) in Sweden, Finland and north-west Russia. There was an intermediate and significant correlation between height ranks at four and 12 years, showing modest G × E interaction for tree height. The corresponding correlation for survival was weak and insignificant, indicating a stronger G × E interaction than for height. The stability parameter (S) for height showed large differences among clones. The plasticity index (PI) values for height ranged from 0.6 to 0.8 among clones, demonstrating high levels of phenotypic plasticity.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2021, 63, 2; 176-182
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stanowisko parczeliny trójlistkowej Ptelea trifoliata L. ssp. trifoliata w lasach Nadleśnictwa Wyszków
    The station of the hop tree (Ptelea trifoliata L. ssp. trifoliata) in forests of the Wyszkow Forest District
    Autorzy:
    Ciosek, M.
    Krechowski, J.
    Piórek, K.
    Sikorski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1312304.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    lasy
    gatunki introdukowane
    parczelina trojlistkowa
    Ptelea trifoliata
    wystepowanie
    stanowiska
    Nadlesnictwo Wyszkow
    testing program
    survival
    tree height
    heritability
    stability of genotypes
    Opis:
    This research was carried out on two experimental plots located in the Rymanów and Nawojowa forest districts. In the second and fifth year after planting, at three and six years of age respectively, survival and height of 25 beech progenies of selected stands were measured. Furthermore, we show the effect of beech origin and growth environment (significant ‘provenance × block’ and ‘provenance × test plot’ interactions). Beeches from both experimental plots differed significantly in growth and survival and this difference increased with tree age. The highest provenance heritability was obtained for the tree height after two years of growth in Rymanów. In Nawojowa, the heritability of beech survival reached zero after five years of growth. An evaluation of the stability of beech provenances (genotypes) in terms of survival and height under the habitat conditions of our experimental plots was done using the Finlay and Wilkinson method. The beech provenances of 469–Nawojowa and 452–Lesko (regional standard) were included as a stable basis for reference. A high degree of stability and high average values for the characteristics investigated indicate highprogeny quality within these stands.
    Źródło:
    Leśne Prace Badawcze; 2015, 76, 1; 49-58
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ekologiczne konsekwencje hodowli drzew w różnym zagęszczeniu III. Stabilność drzewostanu, fitoklimat i różnorodność biologiczna
    Ecological consequences of silviculture at variable stand densities. III. Stand stability, phytoclimate and biodiversity
    Autorzy:
    Jagodziński, A.M.
    Oleksyn, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1011879.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    wiezba drzew
    zageszczenie poczatkowe
    drzewostany
    roznorodnosc biologiczna
    mikroklimat
    lesnictwo
    ekologia lasu
    stabilnosc drzewostanu
    zageszczenie roslin
    stand density
    spacing
    tree competition
    forest ecology
    stand stability
    microclimate
    biodiversity
    review
    Opis:
    The main goal of this review was to characterize ecological consequences of growing trees at variable stand densities. We analyzed the influence of stand density on its mechanical and biological stability, diversity and biomass of understory plants and microclimate conditions (e.g. temperature, humidity, light, etc.). Higher stand density results in higher susceptibility to wind and snow damage, due to changes in height to diameter ratio (tree slenderness). The mechanical stability of stands may be promoted by silvicultural activities such as light thinning applied before growth stagnation. In addition, the reduction of stand density during stand development may increase biomass allocation to coarse roots that stabilize trees in the soil. High tree density may increase stand susceptibility to pathogens and insects and thus increase tree mortality. Trees growing at higher density (with higher intraspecific competition) may allocate less assimilates for defense against herbivorous insects and pathogens. The effect of tree density on stability of multi−species stands is inconclusive, since such studies were only occasionally undertaken. Since tree density influences light conditions (mainly before canopy closure), there is a negative relationship between stand density and herbaceous species diversity and biomass. Based on the published data, we summarized consequences of silviculture at different stand densities and proposed future directions of research needed to fill the gaps in current knowledge. Understanding the long−term ecological consequences of variable stand densities is essential for development of sustainable and stable forest ecosystems.
    Źródło:
    Sylwan; 2009, 153, 04; 219-230
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykorzystanie dwuwymiarowego modelu przeplywu do oceny statecznosci drzewostanow legowych na przykladzie doliny Wisly w okolicy Pulaw
    The application of a two-dimensional of flow pattern to assess wind firmness of riparian forest stands based on the Vistula River valley near Pulawy
    Autorzy:
    Kaluza, T
    Powiązania:
    https://bibliotekanauki.pl/articles/40622.pdf
    Data publikacji:
    2007
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    legi
    model dwuwymiarowy
    modele numeryczne
    tereny zalewowe
    drzewa
    moment krytyczny
    statecznosc
    metody oceny
    marshy meadow
    two-dimensional model
    numerical model
    flood plain
    tree stand
    critical period
    stability
    assessment method
    Źródło:
    Acta Scientiarum Polonorum. Architectura; 2007, 06, 2; 37-48
    1644-0633
    Pojawia się w:
    Acta Scientiarum Polonorum. Architectura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena potomstwa buka zwyczajnego (Fagus sylvatica L.) w początkowych latach wzrostu
    Evaluating the progeny of European beech (Fagus sylvatica L.) in the early years of growth
    Autorzy:
    Banach, J.
    Skrzyszewska, K.
    Smętek, M.
    Kubacki, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1312258.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    hodowla lasu
    drzewa lesne
    drzewostany nasienne
    buk zwyczajny
    Fagus sylvatica
    drzewa potomne
    sadzonki
    przezywalnosc
    wzrost roslin
    drugi rok uprawy
    piaty rok uprawy
    uprawy lesne
    uprawy doswiadczalne
    Nadlesnictwo Rymanow
    Nadlesnictwo Nawojowa
    testing program
    survival
    tree height
    heritability
    stability of genotypes
    Opis:
    This research was carried out on two experimental plots located in the Rymanów and Nawojowa forest districts. In the second and fifth year after planting, at three and six years of age respectively, survival and height of 25 beech progenies of selected stands were measured. Furthermore, we show the effect of beech origin and growth environment (significant ‘provenance × block’ and ‘provenance × test plot’ interactions). Beeches from both experimental plots differed significantly in growth and survival and this difference increased with tree age. The highest provenance heritability was obtained for the tree height after two years of growth in Rymanów. In Nawojowa, the heritability of beech survival reached zero after five years of growth. An evaluation of the stability of beech provenances (genotypes) in terms of survival and height under the habitat conditions of our experimental plots was done using the Finlay and Wilkinson method. The beech provenances of 469–Nawojowa and 452–Lesko (regional standard) were included as a stable basis for reference. A high degree of stability and high average values for the characteristics investigated indicate high progeny quality within these stands.
    Źródło:
    Leśne Prace Badawcze; 2015, 76, 1; 49-58
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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