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    Wyświetlanie 1-6 z 6
    Tytuł:
    Zmiany powierzchni i przestrzennego rozmieszczenia lasow w Polsce w II polowie XX wieku
    Autorzy:
    Polawski, Z.F.
    Powiązania:
    https://bibliotekanauki.pl/articles/45411.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    powierzchnia lasow
    Polska
    lasy
    lesnictwo
    projekt Corine Land Cover
    rozmieszczenie przestrzenne
    wiek XX
    Źródło:
    Leśne Prace Badawcze; 2006, 3; 57-70
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Określenie rzeczywistej powierzchni lasów w Polsce na podstawie dostępnych danych przestrzennych
    Determination of the actual forest area in Poland based on the available spatial datasets
    Autorzy:
    Hosciło, A.
    Mirończuk, A.
    Lewandowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/989623.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    lasy
    tereny lesne
    powierzchnia lasow
    dane przestrzenne
    Polska
    forest cover
    forest land definitione
    forest inventory
    datasets
    Opis:
    Several studies discussed a disagreement concerning forest extent in Poland between land cadaster and status on the ground. The aim of the paper was to assess the actual forest extent in Poland based on an existing spatial datasets such as: Digital Forest Map (covering explicitly the State Forests), Topographic Database, Database of Parcel Identification System, High Resolution Layer (Copernicus Land Monitoring product based on classification of satellite data) and National Forest Data Bank. The geospatial data analyses were preceded by an accuracy assessment of the available datasets, which allowed to assign weights to each of the dataset. The result of this project was the actual forest extent map, which refers to the national definition of forest as defined in the Forest Act of 28 September 1991 (forest by definition is a homogeneous area of 0.1 hectares). This includes all forms of ownership forests and areas that are forested, but officially recorded as non−forest. Moreover, the map of the forest extent under the Kyoto Protocol, including areas that meet the criteria of actual forest extent map and additionally forest areas designed or used for housing, recreation, infrastructure, and other industrial and agricultural areas (e.g.: permanent crops – orchards) were determined. The results confirmed that the actual forest extent is higher by almost 800 thousand hectares then the official statistics provided by the Central Statistical Office of Poland. According to the official statistics forest in Poland covers 29.4% of the country, however this study revealed that 32% of the country, considering the national forest definition, and 33.5%, considering the forest definition under the Kyoto Protocol, is occupied by forest. It showed the need for the land cadaster update. Precise information on spatial distribution of forest extent is crucial for the national purposes i.e. reporting, implementation of the National Afforestation Program and also for the international commitments under the climate convention to determine the accurate forest carbon content and carbon dioxide sequestration.
    Źródło:
    Sylwan; 2016, 160, 08; 627-634
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stan lasow prywatnych w Polsce
    The status of privately owned forests in Poland
    Autorzy:
    Golos, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/46453.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    powierzchnia lasow
    sklad gatunkowy
    gospodarka lesna
    hodowla lasu
    struktura wiekowa
    Polska
    lesnictwo
    lasy prywatne
    zasobnosc drzewostanu
    badania ankietowe
    pozyskiwanie drewna
    Źródło:
    Leśne Prace Badawcze; 2008, 69, 4; 321-335
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wielkoobszarowa inwentaryzacja stanu lasu źródłem informacji o powierzchni lasów w Polsce
    Forest area in Poland based on national forest inventory
    Autorzy:
    Jabłoński, M.
    Mionskowski, M.
    Budniak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/985910.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Polska
    lasy
    lesistosc
    powierzchnia lasow
    zrodla informacji
    inwentaryzacja lasu
    inwentaryzacja wielkopowierzchniowa
    forest definition
    land use
    land cover
    nfi
    cluster sampling
    Opis:
    Forest area in Poland is annually evaluated as a part of public statistics research. However, this information is based on land use resulting from Land and Property Register (LPR). Delays in the reclassification of afforested land, as well as the natural expansion of trees on abandoned agricultural lands, observed over the last decades, caused that information from LPR becomes unreliable. In many countries forest area is assessed within the National Forest Inventories (NFIs) based upon systematic grid of sample plots. NFI in Poland has been performed since 2005, in 4×4 kilometre grid with clusters consisting of five plots. Until 2014 measurements were made only on these sample plots which were located in forest according to LPR records. Within the 3rd NFI cycle (2015−2019) the areas fulfilling the criteria of forest definition, but located on non−forest land referring to LPR, has become the object of study. The aim of this work is to present statistical approach for evaluation of forest area using NFI cluster sampling data. Additionally, results from two year measurements (2015−2016) were analysed and compared with LPR data. Attributes of NFI plots allow to apply national forest criteria as well as the land use and land cover thresholds recommended by Food and Agriculture Organization of the United Nations or Kyoto Protocol. Our research shows that forest cover in Poland is in the range of 32.8−33.0%, depending on forest definition used, and is almost 3% higher than official LPR data (30.1%). The standard error of forest cover, based on two years NFI data is 0.44. Thus, with 95% probability the true value of this parameter lies between 31.9 and 33.7%, while country thresholds of forest definition are used. Additionally it was assessed that using the entire NFI cycle data the standard error of forest cover should be lower i.e. less than 0.3. The National Forest Inventory seems to be an appropriate tool for monitoring forest area in Poland.
    Źródło:
    Sylwan; 2018, 162, 05; 365-372
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Definicja lasu w ujęciu krajowym i międzynarodowym oraz jej znaczenie dla wielkości i zmian powierzchni lasów w Polsce
    National and international definition of forest and its importance for the forest area in Poland
    Autorzy:
    Jabłoński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/989804.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    lasy
    tereny lesne
    powierzchnia lasow
    definicje
    Polska
    Organizacja Narodow Zjednoczonych
    Protokol z Kioto
    forest definition
    forest cover
    land use
    forest expansion
    afforestation
    kyoto protocol
    Opis:
    Sustainable forest management, the leading topic in forest and environmental policy since the 1990s, has required an appropriate tools for both clarification of general principles and measurement of its progress. Many of indicators developed for these purpose are based on forest area. However, definitions of forest are not compatible, especially on national and worldwide scale. Definition of forest applied by FAO refers to crown cover and land use, while definition adopted for reporting under Kyoto Protocol refers only to the occurrence of trees. Polish Act on Forest applies the destination of land use as a determinant of forest. Paper analyses the process of forest area assessment in Poland for the purpose of national as well as FAO and UNFCCC reporting. Natural expansion of trees on abandoned agriculture land, still classified as the agriculture areas in cadastral system, was recognized as the biggest challenge of forest area assessment in Poland. Although natural succession is described by many authors, the total area subjected to this process is unknown. According to the FAO and Kyoto Protocol rules such areas should be reported as forests. As a consequence, forest area in Poland could be at least a few hundred thousand hectares higher than reported in the last assessments basing only on cadastral system. The proper classification of forests not recorded in the cadastral system would also be important challenge, otherwise between forest area on country and international level will be a huge discrepancy. But, there are some areas classified as a forest in Poland, which probably should not be included within FAO and Kyoto reporting. However, the most important topic concerns the possibility of identification of afforested areas, submitted under article 3.3. of Kyoto Protocol, basing on forest area changes between 1989 and 2012. One should recognise if afforested area is not overestimated using such approach, as a result of modification of forest definition in Poland in 1991. Additional question concerns the forest lands included into cadastral system after 1990, but afforested or resulting from natural succession occurring before that time, which currently are reported as afforestation under article 3.3. of Kyoto Protocol.
    Źródło:
    Sylwan; 2015, 159, 06; 469-482
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamika zmian liczby harwesterów w Polsce oraz czynniki determinujące ich występowanie
    Dynamics of harvester fleet change in Poland and factors determining machine occurrence
    Autorzy:
    Mederski, P.S.
    Karaszewski, Z.
    Rosińska, M.
    Bembenek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/989504.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    technika lesna
    mechanizacja prac lesnych
    pozyskiwanie drewna
    maszyny lesne
    harwestery
    liczba maszyn
    rozmieszczenie przestrzenne
    powierzchnia lasow
    pozyskanie drewna
    siedliska lesne
    regionalne dyrekcje Lasow Panstwowych
    Panstwowe Gospodarstwo Lesne Lasy Panstwowe
    ctl technology
    forest enterprises
    coniferous species
    broadleaved species
    Opis:
    W Polsce oraz czynniki determinujące ich występowanie. Sylwan 160 (10): 795−804. In recent years, rapid changes related to forest operations have been observed in the forestry sector in Poland. A growing number of harvesters, an increased volume of harvested timber and a larger proportion of broadleaved species are considered the most important. The objective of this paper was to recognise the dynamics of harvester fleet change in Poland. In particular, there was an emphasis on finding out: 1) the total number of harvesters currently used in Poland (with respect to regions), 2) where and what type of machines were bought, and 3) which main factors influence the occurrence of these machines. In January 2014, a survey was sent to all forest districts. Questions related to harvesters and relevant for this paper included information about: 1) the number of harvesters in use, 2) the serial number of each harvester, 3) place of purchase (within the country or abroad), 4) status of the machine when bought (new or used), and 5) the forest district, in which an open tender was won for 2014. To avoid double counting the same harvester working in two or more forest districts, the serial number of each machine was used for identification. There were 368 harvesters reported in the survey in early 2014, although at the end of 2015 this number rose to 530 machines. The Central−West, North−West and North of Poland had the highest number of harvesters. Most of the harvesters were bought as used, though there may be a growing trend towards the purchase of new machines. A strong correlation was observed between the number of machines used in a region and the total area of lowland coniferous sites and forests, as well as the volume of harvested merchantable softwood. Currently, private forests and broadleaved species are the main factors limiting the application of harvesters in Poland.
    Źródło:
    Sylwan; 2016, 160, 10; 795-804
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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