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    Wyświetlanie 1-11 z 11
    Tytuł:
    Model wzrostu dla olszy czarnej (Alnus glutinosa (L.) Gaertn.)
    A distance−independent tree growth model for black alder (Alnus glutinosa (L.) Gaertn.)
    Autorzy:
    Bruchwald, A.
    Dudzińska, M.
    Wirowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1026558.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    modele wzrostu
    dendrometria
    lesnictwo
    olsza czarna
    Alnus glutinosa
    drzewa lesne
    growth model
    black alder
    Opis:
    The paper presents a stochastic growth model for black alder stands. The model was built on the rich empirical material collected in Poland, and some equations also considered data obtained from black alder stands in Germany. The model describes the concept of a model alder stand. The main characteristic of the model is stand density. This characteristic was used to draw up a thinning programme based on the principles of selective thinning.
    Źródło:
    Sylwan; 2003, 147, 08; 3-10
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rola pędów syleptycznych w kształtowaniu ugałęzienia korony olszy czarnej (Alnus glutinosa (L.) GAERTN.)
    The role of sylleptic shoots in shaping the black alder (Alnus glutinosa (L.) GAERTN.) crown architecture
    Autorzy:
    Dmyterko, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1026427.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    ugalezienie
    korony drzew
    lesnictwo
    pedy syleptyczne
    olsza czarna
    Alnus glutinosa
    drzewa lesne
    sylleptic shoots
    typical shoots
    crown
    black alder
    Opis:
    Black alder is a species capable of producing sylleptic shoots. This process is also detected in alders at older age. The objective of this work is to characterise sylleptic shoots and to determine the role they play in the formation of crown branching. The empirical material used in the experiment was collected in the north and south of Poland and considers both young and old trees.
    Źródło:
    Sylwan; 2003, 147, 06; 60-68
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural diversity and production of alder stands on former agricultural land at high altitudes
    Autorzy:
    Vacek, Z.
    Vacek, S.
    Podrazsky, V.
    Kral, J.
    Bulusek, D.
    Putalova, T.
    Balas, M.
    Kalouskova, I.
    Schwarz, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/41581.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    structural diversity
    stand structure
    alder stand
    agricultural land
    black alder
    Alnus glutinosa
    grey alder
    Alnus incana
    afforestation
    succession
    Sudetes Mountains
    Opis:
    The paper deals with the structural diversity and production of a less frequently studied type of alder stands originated on former agricultural lands in the 1950s, established partly by plantation and partly by natural succession in the area of the Krkonoše Mts. and the Orlické hory Mts. (Czech Republic). Four permanent research plots (PRP) were established at sites where Black alder (Alnus glutinosa L. Gaertn.) and Grey alder (Alnus incana L. Moench.) naturally occurs, each plot of 0.25 ha in size. The aim of the study was to evaluate the structure and development of the alder stands with respect to biodiversity, horizontal, vertical and species structure, diameter increment with emphasis on climate factors, and the quantity and quality of timber production. The results document low diversification of the studied stands in the PRPs. The horizontal structure is defined as random and clumped at sites at the highest altitude with high water table. The number of living trees with DBH ≥ 4 cm ranges between 556 to 828 trees ha-1 with the relative stand density index (SDI) 0.67–0.77. The stand volume ranges from 247 to 393 m3 ha–1, and decreases with higher altitudes. Low temperatures is limiting factor for radial growth in the high mountain areas, respectively low precipitation in the middle lands. Owing to a rather specific site character, as especially the spring area, the stands exhibit only average production, but the production quality is generally high. The quality timber is suitable for industrial use; the rot-affected trunk base parts usable for fuel represent only approximately 16%.
    Źródło:
    Dendrobiology; 2016, 75
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dokładność wzorów empirycznych służących do określania biomasy nadziemnych komponentów drzew olszy czarnej (Alnus glutinosa (L.) Gaertn.)
    Accuracy of empirical formulas for determining aboveground biomass of black alder (Alnus glutinosa (L.) Gaertn.)
    Autorzy:
    Ochał, W.
    Socha, J.
    Grabczyński, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/990997.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    olsza czarna
    Alnus glutinosa
    biomasa
    czesci nadziemne
    wzory empiryczne
    dokladnosc wzorow
    black alder
    aboveground biomass
    accuracy assessment
    empirical formulas
    poland
    Opis:
    The study investigated the accuracy of thirty equations formulated in England, Sweden, Turkey, Lithuania and Spain and which aim to determine the aboveground biomass of black alder. The reference constituted of bark, timber, stem, branches and leaves dry biomass of 168 sample trees aged 6−96 from 56 alder stands located in the western part of Kotlina Sandomierska (south−eastern Poland). The analysed formulas, considering local conditions, resulted in biased biomass calculations. The evaluation of such components as leaves, branches, trunk timber or trunk bark is subject to systematic errors larger than a dozen or so per cent, and in certain ranges of breast height diameters − up to even a couple of dozens or a few hundred per cent. Only three out of 30 formulas may be considered useful for estimating aboveground biomass of black alder in Poland.
    Źródło:
    Sylwan; 2014, 158, 06; 431-442
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ecological features of flowers and the amount of pollen released in Corylus avellana [L.] and Alnus glutinosa [L.] Gaertn.
    Ekologiczne cechy kwiatow oraz obfitosc pylenia Corylus avellana L. i Alnus glutinosa [L.] Gaertn.
    Autorzy:
    Piotrowska, K
    Powiązania:
    https://bibliotekanauki.pl/articles/27803.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    pollen
    pollen grain number
    pollen yield
    pollen season
    tree
    common hazel
    flower feature
    black alder
    Corylus avellana
    shrub
    plant
    flower
    Alnus glutinosa
    Opis:
    Hazel and alder bloom as one of the fi rst plants in climatic conditions of Poland. In the present study, detailed observations were made of the structure of fl owers of Corylus avellana L. and Alnus glutinosa (L.) Gaertn. Pollen yield of the abovementioned species was determined. The number of pollen grains in the theca, anther, fl ower and infl orescence was calculated. A comparison was made of the number of pollen grains of these taxa recorded during the atmospheric pollen seasons analysed over a period of 8 years in the conditions of Lublin. The study demonstrates that pollen yield of the common hazel infl orescence was 66 mg, whereas for black alder it was 120 mg. It was found that the number of pollen grains produced by the alder infl orescence was 2.2 times higher than by the hazel infl orescence. The atmospheric pollen season of the studied plant taxa was recorded at similar dates, but alder pollen was in much larger concentrations.
    Leszczyna i olsza stanowią ważne źródło świeżego pyłku dla pszczół wczesną wiosną, gdy pożytek z innych roślin jest jeszcze niedostępny. Z kilkuletnich badań wynika, że maksymalne uwalnianie pyłku przez leszczynę i olszę w Lublinie przypada w różnych dniach marca lub na początku kwietnia. W prezentowanej pracy przeprowadzono szczegółowe obserwacje budowy kwiatów leszczyny pospolitej i olszy czarnej, określono ich wydajność pyłkową oraz liczbę ziarn pyłku w pylniku. Z przeprowadzonych badań wynika, że średnia masa pyłku jednego kwiatostanu leszczyny pospolitej wynosiła 66 mg, zaś olszy czarnej 120 mg, co jest związane z większą liczbą kwiatów w kwiatostanie olszy. Stwierdzono, że kwiatostan olszy produkuje 2,2 razy większą liczbę ziarn pyłku niż kwiatostan leszczyny. Atmosferyczny sezon pyłkowy badanych taksonów roślin rejestrowany był w zbliżonych terminach, ale pyłek olszy występował w znacznie wyższych koncentracjach.
    Źródło:
    Acta Agrobotanica; 2008, 61, 1
    0065-0951
    2300-357X
    Pojawia się w:
    Acta Agrobotanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Szerokość pasma jądrowego estymatora rozkładu pierśnic w drzewostanach olszy czarnej (Alnus glutinosa (L.) Gaertn.) z zachodniej części Kotliny Sandomierskiej
    Bandwidth of kernel estimator of DBH distribution in black alder (Alnus glutinosa (L.) Gaertn.) stands from west part of the Sandomierz Basin
    Autorzy:
    Pogoda, P.
    Ochał, W.
    Orzeł, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/985919.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    dendrometria
    drzewa lesne
    olsza czarna
    Alnus glutinosa
    piersnice drzew
    rozklad piersnic
    estymacja
    estymatory jadrowe nieparametryczne
    kernel estimator
    bandwidth
    dbh structure
    black alder
    Opis:
    Set of ‘nonparametric’ methods, that don’t make a priori assumption about functional form of empirical distribution was developed as an alternative to the parametric distribution modeling. The kernel estimators are one of such methods, that can be used to describe the frequency of data representing for example DBH records. Kernel smoothing requires the choice of weighting function and bandwidth also called as smoothing parameter or window. The lack of comprehensive analysis on the applicability of particular bandwidth selection methods to model DBH structure gave an impulse to present investigation aimed at determining value and variability of smoothing parameter in black alder stands. The optimal bandwidth was obtained according to six different variants of plug−in method proposed by Altman and Léger. Presented investigations were based on DBH measurements collected in 163 managed black alder stands aged from 6 to 89 years, growing in the west part of the Sandomierz Basin (S Poland). We measured in total 22,530 black alders, from 48 to 359 in individual stand. Stands were characterized by: age, quadratic mean diameter, basal area, mean height, Reineke’s stand density index and standard deviation of DBH. Smoothing parameter was obtained by means of plug−in method with the pilot bandwidth selected by: Silverman’s rule of thumb (nrd0), Scott’s method (nrd), unbiased cross−validation (ucv), biased cross−validation (bcv), method of Sheather and Jones (sj) and one−stage method of Wand and Jones (onestage). The bandwidth was first obtained to real data, then to 100 bootstrap samples of 5, 10, 15 ... and 100 trees from each stand. Smoothing parameters were characterized by mean and variance. Relationship between values of smoothing parameter and stand characteristics was determined. Finally the influence of sample size on value and variability of bandwidth was assessed. Value and variability of smoothing parameter in black alder stands are determined by stand age, sample size and method of bandwidth choice. There is a close relationship between bandwidth and the mean height (r from 0.75 to 0.83), quadratic mean diameter (r from 0.79 to 0.88) and standard deviation of DBH (r from 0.84 to 0.93). Potentially these stand features can be used to predict smoothing parameter values. Minor changes of bandwidth for samples containing above 50 trees together with persistence of standard error give an objective grounds for defining optimal number of diameters, that are necessary to kernel estimation of DBH distribution.
    Źródło:
    Sylwan; 2018, 162, 05; 411-421
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ łuszczenia i czasu przechowywania nasion olszy czarnej (Alnus glutinosa (L.) Gaertner) na kiełkowanie, wschody i wzrost siewek
    Effect of seed extraction, seed lot, and storage duration on germination capacity and seedling emergence of Alnus glutinosa (L.) Gaertner
    Autorzy:
    Tylkowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/991300.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    nasiennictwo
    drzewa lesne
    olsza czarna
    Alnus glutinosa
    nasiona
    luszczenie nasion
    czas przechowywania
    kielkowanie
    wschody
    siewki
    wzrost roslin
    black alder
    seed storage
    containerized cultivation
    seedling growth
    Opis:
    Black alder, a major forest tree species in Europe, thrives in moist soils. During the seeds extraction (nutlets) from the cones, the heaviest seeds were observed to fall out first. Seed weight was not correlated to the ability of germination; no significant differences were observed between the heaviest and the lightest seeds. Seeds with a fresh mass moisture content of 8−9% after storage in –3°C retained their high germinability for six winters. However, seedling emergence decreased gradually when tested in cell trays in an unheated greenhouse. Along with the decline of seedling emergence, the participation of high seedlings (≥25 cm) decreased and participation of small seedlings increased simultaneously. These results question whether the practice of storing seeds in –3°C for long time is the best method of germplasm preservation.
    Źródło:
    Sylwan; 2014, 158, 11; 821-828
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wzory empiryczne pierśnicowych liczb kształtu drewna użytkowego dla olszy czarnej (Alnus glutinosa (L.) Gaertn.)
    Empirical equations for predicting merchantable breast height form factors for black alder (Alnus glutinosa (L.) Gaertn.
    Autorzy:
    Dudzinska, M.
    Bruchwald, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/972823.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    piersnicowa liczba ksztaltu drewna uzytkowego
    lesnictwo
    olsza czarna
    dendrologia
    Alnus glutinosa
    wzory empiryczne
    drzewa lesne
    black alder
    empirical equations
    merchantable volume
    breast height form factor
    Opis:
    The aim of the study was to develop empirical equations for predicting breast height form factors for black alder (Alnus glutinosa). Data used to develop these equations were collected from 1496 felled trees from 136 stands. One hundred and 36 stands were located in northern and southern Poland, respectively. Separate equations to predict stand form factors (F5, F18) and tree form factors (f 5, f 18) were developed. These functions estimate form factor according to tree diameter and the average stand diameter or mean height. Equations can be used to estimate stem volume u.b. to top diameter u.b. of 5 cm or 18 cm (merchantable vol.).
    Źródło:
    Sylwan; 2003, 147, 07; 3-6
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soil acid phosphomonoesterase activity and phosphorus forms in ancient and post-agricultural black alder [Alnus glutinosa (L.) Gaertn.] woodlands
    Autorzy:
    Orczewska, A.
    Piotrowska, A.
    Lemanowicz, J
    Powiązania:
    https://bibliotekanauki.pl/articles/57312.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    soil
    acid phosphomonoesterase
    acid phosphatase activity
    phosphorus form
    ancient forest plant species
    tree stand
    forest soil
    black alder
    Alnus glutinosa
    woodland
    Polska
    post-agricultural soil
    Opis:
    Black alder, an N-fixing tree is considered to accelerate the availability of phosphorus in soils due to the increased production of phosphatase enzymes, which are responsible for the P release from the litter. Acid phosphatase activity plays a pivotal role in organic P mineralization in forest soils and in making P available to plants. In order to check whether Alnus glutinosa stimulates acid phosphomonoesterase (PHACID) activity, we compared enzyme activities, total P concentration (PTOT), plant-available P (PAVAIL), organic P (PORG) and inorganic P (PINORG), and organic matter content in 27 ancient and 27 post-agricultural alder woods (the latter ones representing different age classes: 11-20, 21-40 and 41-60 years) of soil samples taken from the litter and the mineral layers. Phosphomonoesterase activity, organic matter, PTOT, PINORG and PORG concentrations were significantly higher in ancient alder woods than in the soils of post-agricultural forests. Significant differences in the acid phosphatase activity, organic matter and PAVAIL concentration were noted between the litter and mineral layers within the same forest type. In recent stands the amount of organic matter and phosphatase activity increased significantly with the age of alder stands, although only in the mineral layer of their soils. Phosphomonoesterase activity, organic matter and PAVAIL content were higher in a litter layer and decreased significantly at a mineral depth of the soil. The acid phosphatase activity was significantly correlated with organic matter content in both ancient and recent stands. There was no significant relationship between PHACID activity and any P forms.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2012, 81, 2
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dokładność stałych krzywych wysokości dla drzewostanów olszy czarnej (Alnus glutinosa (L.) Gaertn.)
    Accuracy of the uniform height curves for black alder (Alnus glutinosa (L.) Gaertn.) stands
    Autorzy:
    Ochał, W.
    Orzeł, S.
    Siudak, K.
    Zamyślewska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/989648.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    dendrometria
    drzewostany olszowe
    drzewa lesne
    olsza czarna
    Alnus glutinosa
    piersnice drzew
    wysokosc drzew
    stale krzywe wysokosci
    h−d relationship
    uniform height curve
    forest inventory
    black alder
    Opis:
    The study presents the assessment of the accuracy of two generalized height−diameter models, such as skwB [Bruchwald et al. 2001] and skwO [Orzeł et al. 2014], developed in Poland for black alder (Alnus glutinosa (L.) Gaertn.) stands. Verification of these models was conducted on empirical material that was collected in 127 alder stands located in the western part of Sandomierz Basin (southern Poland). Selected alder stands aged 6−89 years, while average breast height diameter ranged from 4.5 to 43.0 cm and average height from 6.3 to 32.7 m. The stand density varied from 222 to 4360 trees/ha. The accuracy assessment for uniform height−diameter curves was based on the analysis of single tree absolute error distributions. Synthetic indicators of goodness−of−fit, such as: average and standard errors, coefficients of variation and determination were calculated based on absolute errors. The final evaluation of the compared uniform height−diameter models results from the structure of the goodness−of−fit measures that was observed within all analyzed stands and within age classes of 20 years. The efficiency of uniform height−diameter models was also compared with stand height−diameter curve, which was developed based on the Näslund function. General height−diameter models overestimated height in alder stands on average from 0.26 (1.67) to 0.19 m (1.39%), based on skwB and skwO models, respectively. Bias depended on the age of stand and decreases from almost 3% in I age class to nearly 0.5% in IV and V age class. For both analyzed models, a positive systematic error was observed for the standardized breast height diameter. Bias in estimating the height of single stand depended on the accuracy of stand height estimations. In case of estimation based on the measurements of three trees height, bias in single stand can range from –13% to +14%. Due to the range and nature of observed systematic errors, uniform height curves should be applied to groups of stands that have different age and breast height diameter structure, as it allows for partial reduction of the error.
    Źródło:
    Sylwan; 2016, 160, 08; 635-646
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reakcja głównych gatunków drzew leśnych w uprawach i młodnikach na obszarze objętym powodzią w Nadleśnictwie Brzeg
    Reaction the main forest species in the forest cultures and samplings on the areas with flood in the Brzeg Forest Inspectorate
    Autorzy:
    Kocjan, H.
    Pawluk, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1019622.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    mlodniki
    gatunki lasotworcze
    Quercus robur
    lesnictwo
    Picea abies
    olsza czarna
    dab szypulkowy
    uprawy lesne
    Pinus sylvestris
    reakcje roslin
    tereny popowodziowe
    sosna zwyczajna
    powodzie
    Alnus glutinosa
    Nadlesnictwo Brzeg
    drzewa lesne
    swierk pospolity
    flood
    scots pine
    norway spruce
    common oak
    black alder
    Opis:
    The flood, which occurred in July and August 1997 on the areas of Brzeg Forest Inspectorate, inundated about 6150 ha of forests. Forests were flooded 3 weeks and the height of water was more than 2 m. Evaluation of the damages caused by the flood were conducted with reference to cultures and sapling of pine, spruce, oak and alder in 1998−2001. The observed damages were not very high.
    Źródło:
    Sylwan; 2006, 150, 01; 31-39
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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