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    Wyświetlanie 1-15 z 15
    Tytuł:
    Climatic sensitivity of delta13C in tree rings of Quercus robur L., Populus tremula L. and Pinus sylvestris L. in Vilnius region (eastern Lithuania)
    Autorzy:
    Barisevičiūtė, Rūta
    Skipitytė, Raminta
    Pukienė, Rutilė
    Lapeikaitė, Indrė
    Kakaras, Irmantas
    Remeikis, Vidmantas
    Powiązania:
    https://bibliotekanauki.pl/articles/956802.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    δ13c
    climate
    tree-rings
    dendroclimatology
    Opis:
    The aim of this work was to evaluate the possibilities of using carbon isotope measurements to determine a strong climate signal of trees influenced by the pollutant stress as well as to examine the difference in reaction of several investigated species to the climate change. Eurasian aspen (Populus tremula), pedunculate oak (Quercus robur) and Scots pine (Pinus sylvestris) trees from Vilnius region were selected for the stable carbon isotope analysis. Our results showed that over the last 70 years (1940–2009) the climate during summer months was the most important factor for the variation of stable carbon isotope values in tree rings, but its influence on different tree species slightly differed. δ13C measurements in Eurasian aspen best corresponded to the air temperature and the precipitation signal in July–August. Oak was more sensitive to the temperature and relative humidity in June–July. A positive correlation coefficient with temperature in the period of transition from the previous vegetation to dormancy season (previous September–October) was specific to oak as well. Scots pine grown at a polluted site was sensitive only to precipitation in summer months of the growing season. The correlation between δ13C measurements and climate data was determined to be from low to moderate in all the investigated trees and did not exceed the value of |r| ≥ 0.71 suggested by McCarroll et al. (2003) as a necessary value for the reliable climate reconstruction. However, the highest correlation coefficient values of 0.65 and 0.61, obtained between the maximal air temperature throughout the hydrological year (previous September–current August) and δ13C in oak rings or between mean monthly sunshine hours throughout July–August and δ13C values in aspen rings, respectively, are comparable with those used in many palaeoclimatic reconstructions that were based even on weaker correlations.
    Źródło:
    Dendrobiology; 2017, 78; 1-9
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth drivers of monumental wild service tree (Sorbus torminalis) out of its natural range in Kyiv, Ukraine
    Autorzy:
    Prokopuk, Y.
    Leshcheniuk, O.
    Sukhomlyn, M.
    Matiashuk, R.
    Budzhak, V.
    Netsvetov, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2130184.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    wild service tree
    tree-rings
    growth pattern
    climatic factors
    Opis:
    Wild service tree (Sorbus torminalis) is a rare, endangered, relict species, that is protected by law in many European countries. Outside the species distribution range, the trees are usually planted in botanical gardens, parks, arboretums, and at the roadside. Such old introduced trees are an important source of knowledge about species’ acclimation process and current growth-limiting factors in the new environment. In Kyiv, the oldest live S. torminalis trees have been planted in botanical gardens and arboretums after the 1950s. In addition, some trees of this species are preserved in front of the historical building Liberman’s mansion, but the year of their planting remains unknown. Regarding dendroclimatological investigations of this species are scarce and have been provided only in Central European forests, a detailed analysis of the species growth-to-climate relationships should be performed not only the species’ natural range but also in its secondary ranges. In this article, we studied three S. torminalis trees in a historical place in Kyiv to determine their age and evaluate environmental conditions driving the growth of this rare species out of its natural range in Kyiv. To reach our goal we used the dendrochronological approaches, i.e. tree-ring dating, partial correlation analysis using stationary and moving time windows. Our results showed that S. torminalis trees were planted after the last building owner S. Liberman’s death (1917). The studied trees are the oldest of known alive S. torminalis trees in Kyiv. Dendroclimatological results revealed S. torminalis is sensitive to higher air temperature and moisture excess in the period of wood formation in Kyiv. S. torminalis trees at 2 Bankova Street are the oldest species examples in Kyiv and have important historical, cultural, and scientific values. S. torminalis species could be widely used in urban forestry, particularly in regions with projected soil moisture shortening.
    Źródło:
    Dendrobiology; 2022, 87; 163-170
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carbon-13 in alpha-cellulose of oak latewood (Jędrzejów, Southern Poland) during the Maunder Minimum
    Autorzy:
    Pazdur, A.
    Korput, S.
    Fogtman, M.
    Szczepanek, M.
    Hałas, S.
    Krąpiec, M.
    Szychowska-Krąpiec, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058897.pdf
    Data publikacji:
    2005
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    13C isotope
    alpha-cellulose
    Maunder Minimum
    tree-rings
    Opis:
    We have studied the δ13C signature in latewood alpha-cellulose of an ancient oak (Quercus robur L.) from a Cisterian Abbey belfry in Jędrzejów (Southern Poland). The time scale for the delta 13C record during 1631-1765 AD was built on the basis of detailed dendrochronology studies. Techniques available for extraction of alpha-cellulose from small samples have been used, the mean value of alpha-cellulose extraction efficiency being ca. 35%. In the delta 13C record of alpha-cellulose the cooling between 1650-1700 AD is clearly visible as a decrease of about 1.5‰. This period is consistent with the interval of the lowest solaractivity between 1645 and 1715 AD, which is known as the Maunder Minimum. Anti-correlation between δ13C and δ13C during the Maunder Minimum was observed but δ13C record is delayed by about 30 years with respect to the Maunder Minimum.
    Źródło:
    Geological Quarterly; 2005, 49, 2; 165-172
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cyclic changes of climate in Europe during the last millenium according to dendrological data
    Autorzy:
    Boryczka, Jerzy
    Stopa-Boryczka, Maria
    Bijak, Szymon
    Miłaszewska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/2029440.pdf
    Data publikacji:
    2008-06-01
    Wydawca:
    Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
    Tematy:
    air temperature
    NAO
    solar activity
    spectrum
    periods
    tendencies
    forecast
    tree-rings
    Opis:
    The paper discusses periodic climate changes in Europe determined on the basis of dendrochronological data dating back one thousand years. In tree-ring width sequences of trees growing in Poland there are approximately 8-, 11-, 100- and 180- year periods. The tree-ring widths of oaks growing in Poland for the last centuries are characterised, without any significant amplitude, by 8- and 11-year periods (Tab. 1). In turn, chronologies of pine, spruce, larch, oak and fir growing in Europe are characterised by 100- and 180-year periods (Tab. 2). Cycles of dendrochronological variables approximate cycles of air temperature and North Atlantic Oscillation NAO as well as those of solar activity. The forecast of annual growth (ring width) for 2001-2100 was calculated by interference of the tree-ring width cycles determined by the sinusoidal regression method. Because of much longer empirical sequences of specific periods, the credibility of forecasts for treering widths is greater than that for air temperature.
    Źródło:
    Miscellanea Geographica. Regional Studies on Development; 2008, 13; 57-66
    0867-6046
    2084-6118
    Pojawia się w:
    Miscellanea Geographica. Regional Studies on Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dendrochronological study of the Sawicki landslide activity in the Beskid Niski Mts (Polish Flysch Carpathians)
    Autorzy:
    Kiszka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/294653.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Geomorfologów Polskich
    Tematy:
    dendrogeomorphology
    mass movement
    landslide activity
    Sawicki landslide
    eccentricity of tree rings
    Beskid Niski Mountains
    Opis:
    The article presents the results of the dendrogeomorphological study of the activity of the Sawicki landslide, located in the Beskid Niski Mts (Polish Flysch Carpathians). The study was conducted within two study sites in the lower part of the landslide. The landslide movements were dated using the dendrogeomorphological method, basing on the eccentricity indicators calculated for the two coniferous species, i.e. Scots pine (Pinus sylvestris) and silver fir (Abies alba). It was found landslide activity in years: 1899, 1901, 1905, 1910, 1913–1914, 1920–1921, 1929–1931, 1935, 1937, 1945, 1977, 1979, 1981, 1984–1985, 1990, 1992–1993, 1997, 2003–2004, 2006, 2010–2012. The greatest activity was characterized for the northern part of the study site B and the south-western slopes of the Szklarki stream valley (study site A). Studies have shown only a partial dependence between precipitation and landslide episodes. The data were confronted with the results of dendrogeomorphological studies, conducted in the northern and central parts of the landslide. The results demonstrate the significant complexity of mass movements within large-area landslide.
    Źródło:
    Landform Analysis; 2016, 32; 9-26
    1429-799X
    Pojawia się w:
    Landform Analysis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lokalne wzorce przyrostowe daglezji zielonej (Pseudotsuga menziesii (Mirb.) Franco) w Polsce
    Autorzy:
    Feliksik, E.
    Wilczyński, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1024078.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    przyrosty radialne
    dendrochronologia
    Pseudotsuga menziesii
    Polska
    daglezja zielona
    lesnictwo
    wzorce przyrostowe
    drzewa lesne
    pseudotsuga menziesii
    poland
    site chronologies
    tree−rings
    Opis:
    The paper describes a construction and characteristic of site tree−ring chronologies and site indexed chronologies of 50 partial populations od Douglas fir in Poland.
    Źródło:
    Sylwan; 2004, 148, 12; 3-13
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Erozja wąwozowa zapisana w odsłanianych korzeniach drzew na Wysoczyźnie Proboszczowickiej pod Górą Św. Anny
    Gully erosion recorded in anatomical changes in exposed roots in permanent gullies (southern Poland)
    Autorzy:
    Malik, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074442.pdf
    Data publikacji:
    2006
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    erozja wąwozowa
    intensywność erozji
    analiza dendrologiczna korzeni
    datowanie epizodów erozyjnych
    permanent gullies
    gully erosion
    exposed roots
    tree rings
    extreme rainfall events
    Opis:
    Erosion occurs in permanent gullies cutting into the undulating loess plateau in southern Poland. The gully slopes are mainly vegetated with beech trees as opposed to the surface of the plateau summit, which is cultivated agricultural land, devoid of forests for at least 18 centuries [od 18 wieków czy od XVIII wieku – czyli “since 1700s”?]. Beech roots are exposed in the gullies through erosion. Wood cells in the tree rings divide into early wood and late wood and, after the roots are exposed, also start to make fewer cells. In the roots on the border between exposed and unexposed tree rings in the tree roots, scars sometimes occur. This is an effect produced by corrasion by dolomites and limestones lying under the loess cover and re-deposition of building material stored by people in the higher part of the gullies. These anatomical changes in root tree rings allow one to date erosion episodes. Dating of the exposure of roots indicates that intensive erosion took place in the gullies starting in the 1980s. Since that time, numerous extreme rainfall events responsible for initiating erosion have also occurred. They contribute to deepening valleys causing new incisions to develop on hillslopes and headcut retreat in upper parts of the valleys studied at theWysoczyna Proboszczowicka near Góra św. Anny. The bottom of the valley head eroded during extreme rainfall events in 1984 and 1991. Erosion here alternates with deposition, its speed being relatively small. Incisions in hill slopes retreated during the flood in 1997, but they originated during earlier rainfall episodes. Such incisions retreat 2.5–3 m/year, i.e., relatively fast.
    Źródło:
    Przegląd Geologiczny; 2006, 54, 4; 326-332
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ żywicowania na przyrost radialny sosny zwyczajnej (Pinus sylvestris L.) na przykładzie drzewostanu w Nadleśnictwie Lidzbark
    Effect of resin-tapping on the radial increment of Scots pine (Pinus sylvestris L.) - case study of a stand from Lidzbark Forest District
    Autorzy:
    Magnuszewski, M.
    Tomusiak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1318415.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    drzewa lesne
    dendrochronologia
    sosna zwyczajna
    Pinus sylvestris
    przyrost drzew
    przyrosty radialne
    zywicowanie
    Nadlesnictwo Lidzbark
    Scots pine
    tree rings
    resin-tapping
    dendrochronology
    Opis:
    The study makes an attempt to evaluate the effect of resin-tapping on the radial increment of Scots pine (Pinus sylvestris L.). Increment cores were taken from two groups of trees: resin-tapped trees and normal trees growing in a 148–year-old pine stand in the Lidzbark Forest District. The cores were taken with the Pressler increment borer from two heights on the tree trunk: 1.30 m and 3.30 m. Using dendrochronological methods, real chronologies were built for each of the four analysed groups of cores. The value and variability of increments for each group were investigated in 20 and 40 year time periods, before and after the start of resin-tapping. In next step, the chronologies were compared and their coefficients of conformity were calculated. As a result, we can state that the radial increments were larger are at 1.3 m height after resin-tapping than before resin-tapping. There was also significant effect of resintapping on radial growth at the height 3.3 m, above the resin-tapping face.
    Źródło:
    Leśne Prace Badawcze; 2013, 74, 3; 273-280
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ czyrenia sosnowego (Phellinus pini (Brot.) Pilat) na przyrosty radialne sosny zwyczajnej (Pinus sylvestris L.)
    Effect of Phellinus pini (Brot.) Pilat occurrence on the radial growth of Pinus sylvestris L.
    Autorzy:
    Tomusiak, R.
    Zarzyński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/980244.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    sosna zwyczajna
    Pinus sylvestris
    grzyby patogeniczne
    czyren sosnowy
    Phellinus pini
    przyrost drzew
    przyrosty radialne
    red ring rot
    white pocket rot
    scots pine
    tree rings
    Opis:
    Scots pine is the most common tree species in Poland with the share in the species structure of Polish forests exceeding 58%. The most dangerous pathogen of this species is Phellinus pini (Brot.) Pilát), which causes the white pocket rot (also called red ring rot) of pine heartwood. It is estimated that as a result of the fungus’s activity, about 8% of annually harvested pine stems is damaged and worthless. As the Ph. pini damages only heartwood, it is often recognized that its occurrence has no influence on the tree’s physiology. As it is still unknown whether the presence of this fungus also does not affect the cambium responsible for the radial growth. We carried out studies in Scots pine stands located in the Radziwiłłów Forest District (central Poland). We investigated trees from 5th and 7th age classes (Biała Góra and Budy Stare forests, respectively). A total of 60 trees were sampled (30 per site). Half of them were specimens showing advanced symptoms of sickness, while the others were healthy specimens with no evidence of infection. From each tree we took one increment core and measured the tree−ring widths. Average tree−ring width was in case of healthy trees significantly higher than for sick trees. The research showed a significant, even of a dozen percent, reduction in the annual increment of infected trees in relation to healthy trees growing on the same site. Presumably, unidentified chemicals secreted to the cambium by the growing mycelium of Ph. pini may be responsible for this. It also seems that this relationship is progressing with the growing age of tree stands and is particularly visible in old stands, for example in reserves. Thus, Ph. pini could be one of the factors limiting the natural age of pine trees and accelerating their dieback. We also found that the growth of trees affected by the disease is influenced by a factor other than climatic, disturbing the natural rhythm of their radial increments. This factor is most likely the presence of mycelium of Ph. pini in the wood.
    Źródło:
    Sylwan; 2019, 163, 07; 576-583
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmienność wybranych cech makrostruktury i gęstości drewna świerkowego pochodzącego z drzewostanów gospodarczych i terenów pogórniczych
    Variability of selected features of macrostructure and density of spruce wood from commercial stands and post-mining areas
    Autorzy:
    Michalec, K.
    Wąsik, R.
    Pająk, M.
    Sikora, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/974056.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    tereny zdegradowane
    drzewostany gospodarcze
    makrostruktura
    sloje przyrostu rocznego
    leśnictwo
    tereny pogórnicze
    drzewostany świerkowe
    drewno świerkowe
    szerokość
    drewno późne
    gęstość drewna
    tree−rings width
    latewood share
    post−mining areas
    reclamation
    Opis:
    The aim of this work was to analyze the tree−ring width, the share of the latewood as well as the density of wood of trees growing in commercial and degraded stands. The research was carried out in the Brynek Forest District (southern Poland) in 3 commercial stands and in 4 degraded stands. For every study plot fifteen spruces were chosen and increment cores were sampled using the Pressler borer. Next, the surface of the cores was smoothed and the width of the annual rings was measured. Latewood zones were determined and the share of latewood was calculated. It was found that the average and minimum tree−ring width was the same in both commercial and degraded stands, while the maximum values were slightly and insignificantly different. In turn, the average share of latewood was higher in trees from commercial stands, but higher minimum and maximum values were recorded in stands on degraded sites. In this case, the differences turned to be statistically significant. The average density of wood was slightly lower in trees from degraded stands compared to wood from commercial stands (413 vs 418 kg/m3). Theminimum and maximum values were also higher in trees from commercial stands. However, this feature did not show a significant difference between analysed groups of stands. We found that despite such significant differences in the terrain formed during the production of zinc and lead ores, the wood of trees growing in these areas hardly shows any differences (except for the share of latewood) in comparison to wood from commercial stands.
    Źródło:
    Sylwan; 2020, 164, 01; 10-15
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lata wskaźnikowe świerka pospolitego w Beskidach Zachodnich
    Pointer years of Norway spruce in the Western Beskidy Mountains (southern Poland)
    Autorzy:
    Wilczyński, S.
    Szymański, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/991365.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    gory
    Beskidy Zachodnie
    drzewa lesne
    swierk pospolity
    przyrost drzew
    sloje przyrostu rocznego
    przyrost grubosci
    czynniki klimatyczne
    lata wskaznikowe
    tree rings
    pointer years
    norway spruce
    western beskidy mountains
    altitudinal zone
    Opis:
    The frequency of site and zonal pointer years in Norway spruce in two altitudinal zones (500−900 m and 900−1370 m a.s.l.) in the Western Beskidy Mountains was analysed. In total, 32 tree stands were studied – 16 in each zone. In both zones number of negative site pointer years increased along with increase of number of positive site pointer years. Above 900 m a. s. l. number of site pointer years increased along with the altitude, while below 900 m a.s.l. their number decreased along with the altitude. We found no common pointer years for all 32 populations. In lower zone, short winter, early and very warm spring or high precipitation in June and July in a given year caused negative pointer years. In the upper one positive pointer years occurred after the warm autumn and in years with the warm growing season.
    Źródło:
    Sylwan; 2014, 158, 12; 883-892
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Jakość drewna sosny zwyczajnej (Pinus sylvestris L.) I. Charakterystyka wybranych cech i właściwości drewna wpływających na jego jakość
    Quality of Scots pine [Pinus sylvestris L.] wood. Part I. Characteristics of selected wood traits and properties affecting its quality
    Autorzy:
    Tomczak, A.
    Pazdrowski, W.
    Jelonek, T.
    Grzywiński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1012211.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    jakosc
    Pinus sylvestris
    drewno pozne
    drewno sosnowe
    seki
    drewno wczesne
    gestosc drewna
    drewno mlodociane
    sloje przyrostu rocznego
    sosna zwyczajna
    drzewa lesne
    wady drewna
    wood quality
    scots pine
    knots
    wood density
    tree rings
    latewood
    juvenile wood
    Opis:
    The study presents the synthetic characteristic of selected wood tissue traits and properties (knots, tree rings, the proportion of latewood, juvenile wood, wood density, dimensions of anatomical elements, cell wall structure), which play significant role in modifications of wood quality. At individual stage of the raw material–product cycle the term "quality" may be interpreted differently, but characteristics determining it remain unchanged. Quality depends on the natural traits and properties of wood.
    Źródło:
    Sylwan; 2009, 153, 06; 363-372
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kształtowanie się przyrostu grubości jodeł z Gór Świętokrzyskich
    Radial increment of silver fir from the Swietokrzyskie Mts.
    Autorzy:
    Bruchwald, A
    Dmyterko, E.
    Bijak, S.
    Łukaszewicz, J.
    Niemczyk, M.
    Wrzesiński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/989406.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    sloje przyrostu rocznego
    analiza dendrochronologiczna
    Gory Swietokrzyskie
    drzewostany jodlowe
    jodla pospolita
    Abies alba
    przyrost drzew
    przyrost grubosci
    przyrosty radialne
    czynniki srodowiska
    czynniki klimatyczne
    zanieczyszczenia przemyslowe
    abies alba mill.
    tree−rings
    increment reduction
    increment release
    disturbances
    Opis:
    The paper presents the dendrochronological analysis of silver firs (Abies alba Mill.) growing in the canopy layer of the forest stands. We searched for the similarities in the rhythm of radial growth of studied trees and we analysed the response of these stands to the increment disturbances related to the occurrence of adverse climatic factors and the pressure from industrial pollution. The research material was collected in 30 pure and uneven−aged silver fir stands located in the Świetokrzyskie Mountains (central Poland). We investigated the effect of age of the stands and the conditions for their growth (location, forest habitat type) on an average tree−ring width. In order to detect similarities in the rhythm of radial growth of the surveyed stands, we grouped the raw chronologies by the means of the cluster analysis, using Ward's agglomeration procedure with 1−r distance (r – Pearson correlation coefficient). We assessed the incremental response of the investigated stands to the disturbances (situations of significantly reduced radial growth) using indicators of resistance, recovery and resilience proposed by Lloret et al. [2011]. We also studied the influence of the stand age and the forest habitat type on the response of analysed for stands to the detected disturbances. The shortest chronology consisted of 94 tree−rings, while the longest one of 137. Average length of the obtained silver fir chronologies was 119 years. Older fir stands characterised with narrower rings (r=–0.451, p=0.012). Neither the location, nor the forest habitat type are the factors determining the similarity of the rhythm of radial growth of silver firs from the Świętokrzyskie Mountains (p=0.243 and p=0.967 respectively). The extreme climatic conditions responsible for the majority of the short−term (one−year−long) incremental depressions are the factor of regional importance, which affects the growth of investigated trees. Older stands characterized with better possibilities of increment recovery after the disturbance than younger stands (p<0.001), which may be a result of the production of secondary crowns. No consistent differences in the indices of resistance and resilience were found among analysed stands.
    Źródło:
    Sylwan; 2016, 160, 11; 893-904
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimisation of MCTS player for The Lord of the Rings: The Card Game
    Autorzy:
    Godlewski, Konrad
    Sawicki, Bartosz
    Powiązania:
    https://bibliotekanauki.pl/articles/2173569.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    computational intelligence
    LoTR
    Lord of the Rings
    Monte Carlo Tree Search
    inteligencja obliczeniowa
    Władca Pierścieni
    Opis:
    The article presents research on the use of Monte-Carlo Tree Search (MCTS) methods to create an artificial player for the popular card game “The Lord of the Rings”. The game is characterized by complicated rules, multi-stage round construction, and a high level of randomness. The described study found that the best probability of a win is received for a strategy combining expert knowledge-based agents with MCTS agents at different decision stages. It is also beneficial to replace random playouts with playouts using expert knowledge. The results of the final experiments indicate that the relative effectiveness of the developed solution grows as the difficulty of the game increases.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; art. no. e136752
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimisation of MCTS player for The Lord of the Rings: The Card Game
    Autorzy:
    Godlewski, Konrad
    Sawicki, Bartosz
    Powiązania:
    https://bibliotekanauki.pl/articles/2128154.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    computational intelligence
    LoTR
    Lord of the Rings
    Monte Carlo Tree Search
    inteligencja obliczeniowa
    Władca Pierścieni
    Opis:
    The article presents research on the use of Monte-Carlo Tree Search (MCTS) methods to create an artificial player for the popular card game “The Lord of the Rings”. The game is characterized by complicated rules, multi-stage round construction, and a high level of randomness. The described study found that the best probability of a win is received for a strategy combining expert knowledge-based agents with MCTS agents at different decision stages. It is also beneficial to replace random playouts with playouts using expert knowledge. The results of the final experiments indicate that the relative effectiveness of the developed solution grows as the difficulty of the game increases.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; e136752, 1--8
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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