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    Wyświetlanie 1-9 z 9
    Tytuł:
    Ryzyko powstawania szkód w drzewostanach poszczególnych nadleśnictw Polski
    Risk of damage to stands in individual forest districts in Poland
    Autorzy:
    Bruchwald, A.
    Dmyterko, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/995538.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Panstwowe Gospodarstwo Lesne Lasy Panstwowe
    nadlesnictwa
    uszkodzenia drzewostanow
    szkody w lesie
    ryzyko wystapienia
    zroznicowanie regionalne
    wspolczynniki reginalnego ryzyka uszkodzenia drzewostanow
    stand damage risk model
    stand damage risk factor
    regional damage risk factor
    forest district
    Opis:
    In the study, regional stand damage risk factors were developed for individual forest districts in Poland. For this purpose we used the materials contained in the database of the State Forests Information System (SILP), which relate to the volume of wood obtained from windfalls and deadwood in all forest districts in Poland in the years 2005−2010. The criterion proposed was the maximum annual damage during the period under review expressed as volume of wood obtained from wind−thrown and wind−broken trees, as well as deadwood per hectare of forest stands older than 40 years in a forest district. This allowed to assign regional damage risk factor values to individual units. They range from 0, corresponding to a very low damage risk to stands, to 4, indicating a very high risk. Presented map of the regional stand damage risk factors for the forest districts in Poland is the graphic result of the analysis.
    Źródło:
    Sylwan; 2012, 156, 01; 19-27
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie modelu ryzyka uszkodzenia drzewostanu przez wiatr do oceny prawdopodobieństwa lokalizacji szkód w lasach Regionalnej Dyrekcji Lasów Państwowych w Białymstoku
    Application of the wind damage risk model for the assessment of the probability of the location of damage to forests of the Regional Directorate of the State Forests in Bialystok
    Autorzy:
    Bruchwald, A.
    Dmyterko, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/985727.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    wiatry
    szkody w lesie
    drzewostany
    ryzyko uszkodzenia
    ocena ryzyka
    modele ryzyka uszkodzenia
    RDLP Bialystok
    wind damage risk model
    wind damage risk factor
    Opis:
    In June 2016, a hurricane damaged the forests of the Regional Directorate of the State Forests in Białystok (eastern Poland), resulting in the removal of approximately 1.9 million cubic meters of wind−fallen and wind−broken trees and deadwood by the end of 2018. The research material was obtained from the database of the State Forests Information System and used to assess the functioning of the wind damage risk model. The wind damage risk model determines the value of damage risk factor Wr for each stand ranging from 0 to 3; a higher value indicates a higher risk of damage to the stand. The damage risk factor allowed to create six damage risk classes, with a width of 0.5 each and to assign individual stands of the forest district to one of the classes. The areal share of damaged stands was calculated for each class. In 2015, i.e. before the hurricane, the share of stands in the highest damage risk class VI ranged from 0.1% to 3.5%. After the hurricane in 2016, the areal share of damaged stands was calculated for each class, the largest share (the largest damage) being in class VI, while the share of the most damaged stands were found in the following forest districts: Dojlidy – 71%, Supraśl – 79% and Żednia – 87%. In 9 other forest districts, the area of damaged stands in class VI also exceeded 70%. The wind damage risk model for the stand presented in the paper allows identifying stands where damage is very likely to occur, when the wind comes. This may limit the level of wind damage through, in the first place, the rebuilding of stands classified to the highest wind damage risk factor class.
    Źródło:
    Sylwan; 2019, 163, 08; 629-636
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zagrożenie lasu przez wiatr na przykładzie nadleśnictw Puszczy Białowieskiej
    Risk of wind damage to stands on the example of selected forest districts in the Bialowieza Primeval Forest
    Autorzy:
    Bruchwald, A.
    Dmyterko, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1008781.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Puszcza Bialowieska
    nadlesnictwa
    Nadlesnictwo Browsk
    Nadlesnictwo Bialowieza
    Nadlesnictwo Hajnowka
    lasy
    zagrozenia lasu
    wiatry
    uszkodzenia drzewostanow
    ryzyko uszkodzenia
    modele ryzyka uszkodzenia
    stand damage risk model
    stand damage risk factor
    wind
    białowieża primeval forest
    Opis:
    Stand damage risk model was applied to three forest districts located in the Białowieża Primeval Forest: Browsk, Hajnówka and Białowieża. For this purpose, information contained in the database of the State Forests Information System was used. The obtained values of the stand damage risk factor allowed assigning each stand to one of the six risk classes. Higher class indicates higher damage risk to stands. The share of the stand area was calculated for each class. The weighted average of the areal shares of stands in the two highest damage risk factor classes was used as a measure of wind damage risk to forests. The values of this measure for individual forest districts were as follows: Browsk – 27.3%, Hajnówka – 33.0%, Białowieża – 38.3%. The degree of risk to these forests ranges from average to high, which is mainly because of large proportion of the high, old−growth spruce stands. Forest stands of the Białowieża Primeval Forest with a high risk factor are threatened by damage in the event of strong winds in this area.
    Źródło:
    Sylwan; 2012, 156, 10; 750-764
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zagrożenie lasów Polski na podstawie modelu ryzyka uszkodzenia drzewostanu przez wiatr
    Risk of the wind damage to the forests in Poland on the basis of a stand damage risk model
    Autorzy:
    Dmyterko, E.
    Mionskowski, M.
    Bruchwald, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/989828.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    zagrozenia lasu
    wiatry
    huragany
    uszkodzenia drzewostanow
    modele ryzyka uszkodzenia
    Polska
    wind damage
    stand damage risk model
    poland
    Opis:
    On the basis of the wind damage risk model for forests using the data of the State Forests Information System, the stand damage risk factor Wr for each of the 430 forest districts in Poland and the threat measure Ms for a given forest district were determined. The measure of threat to forest Ms for a forest district is a methodical basis for assessing the potential damage to forests in Poland. Its value ranges from 8.1% for the Brzózka Forest District to 48.9% for the Ujsoły Forest District (fig. 1), giving the average value of 24.6% and standard deviation of 7.03%. The measure Ms was the basis for differentiating the levels of threat of wind damage to forest for forest districts. Level 1 (Ms≤10%) indicates low threat, level 2 (10%40%) – very high threat. Low threat to forests was found only in two forest districts located in the western part of the country. 113 forest districts, which form large concentrations particularly in western and central Poland, are exposed to an elevated threat. Most forest districts (233) are classified to a group of moderate threat. They are located across the country and are mostly concentrated in the northern and southern regions of Poland. 71 forest districts exposed to high threat are concentrated in the south of Poland in the Carpathians and the Sudetes, with scattered presence in the north of the country. Most of the 11 forest districts with a very high threat to forests are located in the mountains (tab., fig. 1). For the forest districts with a particularly high and very high threat, new silvicultural procedures and the basis for decision making in the field of forest management should be developed to reduce the risk of damage to forest.
    Źródło:
    Sylwan; 2015, 159, 05; 361-371
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany zachodzące w drzewostanach Bieszczadów
    Changes in the forests of the Bieszczady Mts.
    Autorzy:
    Dmyterko, E.
    Bruchwald, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/985915.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    lasy gorskie
    Bieszczady
    drzewostany
    sklad gatunkowy
    zmiany w drzewostanach
    zmiany skladu gatunkowego
    model wzrostu drzewostanu
    modele ryzyka uszkodzenia
    species composition
    stand growth model
    model allowable cut
    wind damage risk model
    forest threat
    measure
    Opis:
    The aim of the study was to analyse (on the basis of the data from the State Forests Information System) the changes occurring in the Bieszczady forests in the period of 2007−2016. One of the processes taking place in the study area is the withdrawal of grey alder stands and the appear− ance of natural regeneration of mainly beech and fir, and in a smaller proportion spruce (fig. 1). Another natural process is the encroachment of fir and beech under the canopy of pine stands, which is favoured by fertile habitats that meet the ecological requirements of these two tree species. As a result of economic activity supporting these processes, alder and pine stands are being rebuilt relatively quickly, turning into fir or beech stands, and sometimes into mixed stands with the participation of other tree species, including spruce (fig. 1). The decline of spruce stands occurs on the dominant area in Poland: in Beskid Śląski and Beskid Żywiecki, the Kaszuby Forest or the Białowieża Forest. The main causes of this process are abiotic and biotic factors, including frequent droughts causing the lowering of the groundwater level and insect outbreaks, especially of bark beetles. The proportion of spruce in the Bieszczady Mountains is relatively small (about 10%), and the high fertility of the habitats compensates, to some extent, the relatively high moisture requirements of this tree species and probably these factors determined the lack of decline of spruce stands in the analysed area. In the last 10 years, the average age of forests in the Bieszczady Mountains increased from 77 to 83 years (tab. 2), mainly as a result of too low volume of harvested timber (fig. 3). Comparing the total harvested volume with the volume of allowable cut determined by the stand growth model, the harvest of the wood raw material was understated by about 25%. The aging of forests is also confirmed by changes in stands in age classes (fig. 2). The aging of the Bieszczady forests is correlated with the process of increasing the threat to these forests by wind (figs. 4−5). The wind damage risk factor increased over the next 10 years in the two highest threat level, and thus the area of threatened stands increased. The forest threat measure in the Bieszczady forests increased in general as well as in individual forest districts (fig. 6). The forests in two of these districts are currently among the most threatened in Poland.
    Źródło:
    Sylwan; 2018, 162, 05; 355-364
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stochastyczny model określania miąższości złomów, wywrotów i posuszu
    Stochastic model for calculating the volume of wind-broken and wind-thrown wood as well as of deadwood
    Autorzy:
    Bruchwald, A.
    Dmyterko, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/990021.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    uszkodzenia drzewostanow
    zlomy
    wywroty
    posusz
    miazszosc
    modele stochastyczne
    damage
    risk model
    wind
    Opis:
    The most recent version of the wind damage risk model was published in 2012. The model is based on eleven stand characteristics of which stand damage that occurred in the last decade is among the most important ones. It is expressed as the volume of wood obtained from wind−broken and wind−thrown trees as well as of deadwood. Not taking this feature into consideration would undermine the value of this damage risk factor. In the study, the material contained in the database of the State Forests Information System was used to develop a model for calculating the volume of wood obtained from wind−broken and wind−thrown trees as well as of deadwood. This allowed to apply the stand damage risk model to determine, inter alia, the risk of damage in a multi−variant forecast of timber resources.
    Źródło:
    Sylwan; 2014, 158, 04; 258-266
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamika rozpadu drzewostanów świerkowych w Beskidzie Śląskim
    Decline of Norway spruce stands in the Beskid Slaski Mts.
    Autorzy:
    Dmyterko, E.
    Bruchwald, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/986624.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Beskid Slaski
    drzewostany swierkowe
    zamieranie drzew
    swierk pospolity
    Picea abies
    rozpad drzewostanow
    System Informatyczny Lasow Panstwowych
    model wzrostu drzewostanu
    rozmiar uzytkowania rebnego
    zagrozenia lasu
    szkody od wiatru
    modele ryzyka uszkodzenia
    Nadlesnictwo Wisla
    Nadlesnictwo Wegierska Gorka
    Nadlesnictwo Ustron
    Nadlesnictwo Bielsko
    forest decline
    picea abies
    stand growth model
    harvest volume model
    wind damage risk model
    forest
    threat measure
    Opis:
    The dynamics of decline of Norway spruce forests in the Beskid Śląski Mts. (S Poland) in a 2007−2016 period was analysed based on data from the State Forests Information System. For that purpose we used modified growth model and wind damage risk model. The harvested timber volume (salvage cuts) exceeded the allowable harvest modeled with the stand growth model by 270% in years 2007−2010 (earlier period) and by 89% in the 2011−2016 (later period) period. The highest volume exceed (503 and 307% for earlier and later period respectively) was recorded for the Wisła Forest District. For the deadwood, the harvested volume exceeded the modeled one by 45% (162 in earlier, and 59% in later period). In the Węgierska Górka Forest District the harvested volume amounted to 287% of the modeled one (438 in earlier, and 70% in later period). The largest amount of wind−broken and wind−fallen trees was found in Wisła. Their volume amounted to 48% of the modeled volume (59 in earlier, and 40% in later period). The highest exceed occurred in Węgierska Górka (89 and 70% in the later period respectively). The species composition in the analysed region changed significantly as the share of spruce decreased and share of beech and fir increased (tab. 1). Changes in the aeral fraction of stands in age classes in the Bielsko and Ustroń forest districts were insignificant (tab. 2). For Węgierska Górka, share of stands in age class <20 years increased from 11 to 40%, while the older stands fraction decreased. Major changes occurred in Węgierska Górka and Wisła as far as structure of the stands in the risk damage factor classes is concerned. Fraction for the risk factor classes I and II increased, while for class VI decreased (tab. 3, fig. 4). The highest dynamics of the wind threat measure was recorded especially in Węgierska Górka, where its value decreased from 42 in 2009 to 19 in 2016 (fig. 5). The biggest changes are likely to occur in Wisła in the next years due to the very high fraction of spruce. A significant damage caused by wind may also be expected in Ustroń, where the threat measure is high.
    Źródło:
    Sylwan; 2018, 162, 03; 189-199
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nowy wariant modelu ryzyka uszkodzenia drzewostanu przez wiatr
    New variant of the wind damage risk model for forest stands
    Autorzy:
    Dmyterko, E.
    Bruchwald, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/991151.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    wiatry
    lasy prywatne
    szkody w lesie
    drzewostany
    uszkodzenia drzewostanow
    ryzyko uszkodzenia
    obliczenia
    modele ryzyka uszkodzenia
    wind damage
    risk factor
    private forests
    Opis:
    The paper presents a new variant of the wind damage risk model for forest stands in view of its application in the forests under private ownership. It was based on the following characteristics: average height, age and slenderness of the main tree species, stand density index, species composition, forest habitat type, as well as stand location in the region of the country and the volume of windbreaks, windfalls and deadwood in previous years. The latter characteristic in the new model variant is generated by the stand damage model. The new wind damage risk model variant determines the risk factor for individual stands ranging from 0 to 3. A higher value of the factor indicates a higher wind damage risk for the stand. The verification of the model was performed using the forest data from two counties (powiat) situated in the Podkarpackie Province. The wind damage risk factors obtained from the model are shown on numerical maps.
    Źródło:
    Sylwan; 2014, 158, 08; 571-578
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena zagrożenia upraw i młodników sosnowych przez choinka szarego Brachyderes incanus L. (Coleoptera, Curculionidae) oraz możliwości przeciwdziałania szkodom
    Risk rating for Brachyderes incanus L. in Scots pine plantations and thickets and the possibilities of damage counteraction
    Autorzy:
    Malinowski, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1018591.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    zagrozenia lasu
    mlodniki sosnowe
    ocena zagrozenia
    owady
    szkodniki roslin
    choinek szary
    Brachyderes incanus
    uprawy sosnowe
    lesnictwo
    uprawy lesne
    brachyderes incanus
    risk rating methods
    scots pine plantations
    scots pine thickets
    needles damage
    damages counteraction
    Opis:
    Methods for rating the risk of damages to Scots pine plantations and thickets from B. incanus as well as the methods of damages counteraction are described. Risk rating is based on a number of B. incanus beetles and on a degree of needles damage (involving the percent of infested needles and the percent of destroyed needles lenghts). Damages counteraction is connected with the usage of mineral fertilizers and chemical treatments.
    Źródło:
    Sylwan; 2006, 150, 10; 50-55
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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