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    Wyświetlanie 1-4 z 4
    Tytuł:
    Realizacja użytkowania przedrębnego w Lasach Państwowych w okresie 1999-2004
    Intermediate harvest realised in the State Forests in the period 1999-2004
    Autorzy:
    Borecki, T.
    Pieniak, D.
    Wójcik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1006340.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Panstwowe Gospodarstwo Lesne Lasy Panstwowe
    uzytkowanie lasu
    uzytkowanie przedrebne
    regulacja uzytkowania przedrebnego
    intermediate harvest
    regulation
    expected current volume increment
    Opis:
    Focus of the study was on the economic importance of intermediate harvest regulation. Analysis of the research material concerned mainly the ratio of the intermediate harvest to the expected 50% ten−year current volume increment. Study was realised in Scots pine stands in 337 forest districts all over Poland.
    Źródło:
    Sylwan; 2012, 156, 11; 848-854
    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:
    Production of selected crop plants in Poland over the period of 2010-2019
    Autorzy:
    Jarecki, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2083773.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    area of cultivation
    yields
    harvest volume
    plant production
    Polska
    Opis:
    Plant production in Poland is growing dynamically, which is an effect of natural, economic and social factors. A measurable effect of this is a change in the area of cultivations, yields, and in the amounts of harvested crops. Based on the data published by Statistics Poland, it has been demonstrated that in the period of 2010-2019 there has been an increase of the area of wheat cultivation in Poland, while the area of cultivation of barley, triticale and oilseed rape remained at a stable level. There was a slight decrease in the area of cultivation of rye, cereal mixes and potato, and a slight increase in the case of sugar beet. In the analysed years, the yields of crop plants in Poland were at a stable level. There was only a slight increase of yields of sugar beet and oilseed rape, and a small decrease of yields of cereal mixes. In the ten-year period under analysis no distinct changes were noted in the amount of harvested crops in the country. In the case of sugar beet there was a slight increase, and in the case of cereal mixes a more pronounced decrease in the harvest volume.
    Źródło:
    Acta Agrophysica; 2020, 27; 39-45
    1234-4125
    Pojawia się w:
    Acta Agrophysica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Indukcyjna metodyka prognozy rozwoju zasobów drzewnych
    Inductive methodology of the forecast of wood resources development
    Autorzy:
    Wysocka-Fijorek, E.
    Zajączkowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/979067.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    harvest growth increment
    volume
    area
    resource modelling
    Opis:
    For effective forest management, comprehensive information on the condition and structure of wood resources is needed, as well as a forecast of their development and the possibility of harvest cutting in the long term. The paper objectives is to present a methodology of predicting the development of wood resources and the possibility of main cutting based on the current state of the forest. Presented methodology of the forecast preparation is based on the inductive type of prediction in which future directions of changes are predicted based on past events. Such forecast finds expression of conscious human activity in actively shaping the future, while it does not seek to determine the target state of the forest, but it is assumed that shaping the state of the forest can be subject to constant evolution. The forecast of the development of wood resources in individual forest areas may be based on the data contained in the forest management plans, and these data may be compiled either for individual forest districts (or other forest units), or for groups of forest districts (e.g. for regional directorates of the State Forests, or the State Forests in total). The initial data, necessary to make forecasts, are primarily: a tabular comparison of the stands area and volume in age classes and subclasses; projected afforestation area; intensity indicators of final cutting and intermediate felling determining the harvesting intensity in relation to the size of wood resources in individual classes and age subclasses; and the expected volume of current volume increment over the adopted forecast periods. Additional data contains: approximate share of clear− and complex cutting in final felling; adopted distribution according to the age classes of the young generation after removal cuts in stands kept in complex cutting; average length of the regeneration period; and average age of stands in regeneration classes – used to determine the average age in forest areas for which a forecast is made. Presented methodology makes it possible to determine and analyse anticipated changes in area and volume in age classes, average age and average stand volume as well as possibilities of final and intermediate cutting, and the harvesting intensity in relation to the size of wood resources and the current volume increase in the adopted forecast periods.
    Źródło:
    Sylwan; 2020, 164, 04; 267-279
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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